You searched for subject:(electric dipole moment).
Showing records 1 – 30 of
46 total matches.
◁ [1] [2] ▶
University of Manitoba
1.
Das, Moushumi Jr.
Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.
Degree: Physics and Astronomy, 2018, University of Manitoba
URL: http://hdl.handle.net/1993/33655 
► A non-zero neutron electric dipole moment (nEDM) would indicate time-reversal and charge-parity violation. Our collaboration is developing an experiment at TRIUMF to improve the sensitivity…
(more)
▼ A non-zero neutron
electric dipole moment (nEDM) would indicate
time-reversal and charge-parity violation. Our collaboration is
developing an experiment at TRIUMF to improve the sensitivity to the
nEDM by one order of magnitude (10
-27~e∙cm). I developed a
highly sensitive magnetometer based on nonlinear magneto-optical
rotation (NMOR) in Rb vapour. In the future such magnetometers will
serve in an array to form an auxiliary magnetometer
system monitoring the stability and uniformity of the magnetic field
in the nEDM experiment. The operation of the magnetometer in a
free-induction-decay mode was the focus of this thesis. The precision
of the field measurement, drifts over time, the impact of degaussing, and
measurements of transverse fields were studied using the magnetometer.
Advisors/Committee Members: Martin, Jeff (Physics and Astronomy) (supervisor), Gwinner, Gerald (Physics and Astronomy) Thomson, Douglas (Electrical and Computer Engineering) (examiningcommittee).
Subjects/Keywords: neutron electric dipole moment; neutron electric dipole moment; neutron electric dipole moment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Das, M. J. (2018). Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33655
Chicago Manual of Style (16th Edition):
Das, Moushumi Jr. “Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.” 2018. Masters Thesis, University of Manitoba. Accessed April 10, 2021.
http://hdl.handle.net/1993/33655.
MLA Handbook (7th Edition):
Das, Moushumi Jr. “Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.” 2018. Web. 10 Apr 2021.
Vancouver:
Das MJ. Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. [Internet] [Masters thesis]. University of Manitoba; 2018. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1993/33655.
Council of Science Editors:
Das MJ. Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. [Masters Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/33655
Penn State University
2.
Tang, Cheng.
Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium.
Degree: 2018, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/15004czt140
► This dissertation describes our continued effort at Penn State to push the sensitivity on the electron electric dipole moment (EDM) down to the level of…
(more)
▼ This dissertation describes our continued effort at Penn State to push the sensitivity on the electron
electric dipole moment (EDM) down to the level of 2.5 × 10
-30 e∙ cm using trapped cold cesium and rubidium atoms. The sensitivity to the EDM increases linearly with the
electric field. The
electric field is generated using electrodes made of the transparent conductor, indium tin oxide (ITO), which allows optical access to the atoms. The maximum
electric field the electrodes can sustain is around 37 kV/cm, 2 to 3 times lower than the maximum fields attained in mock-ups. While we are continuing to work to increase the strength of the
electric field, we have developed an alternative EDM measurement scheme that works at low field. This alternative measurement scheme begins by the simple process of preparing atoms in the m=0 magnetic sublevel. By measuring the probability of detecting atoms in the m=0 state after evolution in
electric and magnetic fields, we can obtain a sensitivity close to the original measurement scheme.
We enumerate several notable aspects of our alternative measurement scheme. First, detection of all magnetic sublevels recovers the full sensitivity of precession from the m=0 state, which is the same for all precession phases. Second, when the total population in the even magnetic sublevels is measured, it does not depend on quadratic energy shifts due to
electric or magnetic fields that are perpendicular to the measurement axis. Third, we can construct a combination of the populations of magnetic sublevels to extract a pure sinusoidal signal.
We have also refined many experimental techniques in the process of restoring the vacuum and the atom signal. In particular, we constructed a stack of Cooke triplets for collecting the fluorescence from the atoms, which provides the essential data in the experiment. This newly developed imaging system successfully resolved the blurring issue in our previous design.
We did not perform a measurement of the EDM in this dissertation. It is likely that a measurement can be performed in a year.
Advisors/Committee Members: David Scott Weiss, Dissertation Advisor/Co-Advisor, David Scott Weiss, Committee Chair/Co-Chair, Nathan David Gemelke, Committee Member, Stephane Coutu, Committee Member, Venkatraman Gopalan, Outside Member.
Subjects/Keywords: Electron electric dipole moment; cold cesium
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tang, C. (2018). Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15004czt140
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tang, Cheng. “Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium.” 2018. Thesis, Penn State University. Accessed April 10, 2021.
https://submit-etda.libraries.psu.edu/catalog/15004czt140.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tang, Cheng. “Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium.” 2018. Web. 10 Apr 2021.
Vancouver:
Tang C. Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Apr 10].
Available from: https://submit-etda.libraries.psu.edu/catalog/15004czt140.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tang C. Progress Towards a Measurement of the Electron Electric Dipole Moment Using Cold Cesium. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15004czt140
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
North Carolina State University
3.
DuBose, Franklin H.
Development of Two Components for the Neutron Electric Dipole Moment Experiment.
Degree: PhD, Physics, 2009, North Carolina State University
URL: http://www.lib.ncsu.edu/resolver/1840.16/3759
► The discovery of a nonzero electric dipole moment for the neutron (nEDM) would have a fundamental impact upon the current understanding of the weak and…
(more)
▼ The discovery of a nonzero
electric dipole moment for the neutron (nEDM) would have a fundamental impact upon the current understanding of the weak and strong nuclear interactions. The Standard Model predicts a value for the
electric dipole moment that is several orders of magnitude lower than that which can currently be probed. Thus, a non-zero value at the order expected in the proposed experiment
(10-28 e cm) would indicate new sources of T and CP violation, thereby either extending or disproving aspects of the Standard Model.
The current neutron
electric dipole moment experiment takes advantage of the known neutron magnetic
moment. The neutrons are placed in liquid helium, in a plane perpendicular to parallel magnetic and
electric fields B0 and E0, causing them to precess with frequency vn, giving energy
hn = -2dnB0 – 2dnE0
with dn and un the neutron magnetic and
electric dipole moments respectively. The impact of the
electric field upon the precession of the neutron can thus be used to characterize the neutron charge distribution.
The liquid helium is doped with trace amounts of 3He, which functions as both a detector via the reaction
and as a comagnetometer. The neutron absorption cross section of 3He is strongly spin dependent. Thus, for each test run, it is necessary to polarize the 3He before using it to dope the isotopically pure helium. Scintillation pulses originate when ionizing radiation creates excited electronic states in the helium. Specifically, when the proton and 3H recoil in the helium, both the molecular singlet and triplet states become populated. The track length of these particles in the liquid is approximately 1 mm, whereas background events from electrons that arise from neutron decay or Compton scattered gamma ray events have track lengths of order 1 cm. The differing track lengths, and thus energy deposition per unit length, changes the dynamics of the relative amounts of singlet and triplet states produced. The use of the ratio of the singlet to triplet events shows great promise in distinguishing the nEDM signal from events associated with background ionizing radiation.
As part of the measurement process, the helium is doped with 3He that serves as the comagnetometer. As this helium depolarizes, it is necessary to remove this 3He before inserting more polarized 3He. We are developing an evaporative purification technique that can facilitate this removal, therby lowering the concentration of 3He in 4He from approximately 10-10 to 10-12. The operating temperature for the experiment, 400 mK to 600mK, places a constraint upon the effectiveness of this technique. It is therefore necessary to design and optimize an appratus capable of performing the above mentioned purfication in a time much less than the measurement time of approximately 22 minutes. Additional experimental concerns involve minimizing the introduction of heat to the system and effectively removing the evaporated gas from the testing area.
Advisors/Committee Members: Dr. Paul Huffman, Committee Chair (advisor).
Subjects/Keywords: neutron electric dipole moment cryogenics 3He 4He
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
DuBose, F. H. (2009). Development of Two Components for the Neutron Electric Dipole Moment Experiment. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/3759
Chicago Manual of Style (16th Edition):
DuBose, Franklin H. “Development of Two Components for the Neutron Electric Dipole Moment Experiment.” 2009. Doctoral Dissertation, North Carolina State University. Accessed April 10, 2021.
http://www.lib.ncsu.edu/resolver/1840.16/3759.
MLA Handbook (7th Edition):
DuBose, Franklin H. “Development of Two Components for the Neutron Electric Dipole Moment Experiment.” 2009. Web. 10 Apr 2021.
Vancouver:
DuBose FH. Development of Two Components for the Neutron Electric Dipole Moment Experiment. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Apr 10].
Available from: http://www.lib.ncsu.edu/resolver/1840.16/3759.
Council of Science Editors:
DuBose FH. Development of Two Components for the Neutron Electric Dipole Moment Experiment. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/3759
University of Manitoba
4.
Klassen, Wolfgang.
All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment.
Degree: Physics and Astronomy, 2020, University of Manitoba
URL: http://hdl.handle.net/1993/34596
► High-precision low-energy experiments are one of the best ways we have of probing physics beyond the standard model (BSM). One BSM prediction is a small…
(more)
▼ High-precision low-energy experiments are one of the best ways we have of probing physics beyond the standard model (BSM). One BSM prediction is a small but non-zero
electric dipole moment for the neutron (nEDM). This quantity means that the neutron breaks a fundamental symmetry of nature, the symmetry between particles and their anti-particles. This symmetry is known as Charge-Parity (CP) symmetry, and finding a new system that violates it could help explain (among other things) the matter-antimatter asymmetry in the early universe.
The
electric dipole moment (EDM) of any particle is very sensitive to
electric and magnetic fields. In order to measure the neutron EDM (nEDM) to our desired precision, the magnetic field present in the experiment must be known with a statistical precision of 10 fT over the nEDM measurement period (one Ramsey cycle). In addition, any gradients up to a third order polynomial field expansion must also be identified, as they contribute to systematic uncertainty.
I develop the theoretical framework describing magnetic fields in the TRIUMF Ultra Cold Advanced Neutron (TUCAN) nEDM experiment, prescribe a method by which scalar field measurements can be used to extract systematic magnetic field dependant effects, and build a proof of concept optical magnetometer meeting the above requirements.
Advisors/Committee Members: Martin, Jeffery (Physics), Mammei, Russell (Physics) (supervisor), Deconinck, Wouter (Physics and Astronomy), Burgess, Jacob (Physics and Astronomy) (examiningcommittee).
Subjects/Keywords: Physics; Nuclear Physics; Electric Dipole Moment; Neutron
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Klassen, W. (2020). All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/34596
Chicago Manual of Style (16th Edition):
Klassen, Wolfgang. “All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment.” 2020. Masters Thesis, University of Manitoba. Accessed April 10, 2021.
http://hdl.handle.net/1993/34596.
MLA Handbook (7th Edition):
Klassen, Wolfgang. “All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment.” 2020. Web. 10 Apr 2021.
Vancouver:
Klassen W. All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment. [Internet] [Masters thesis]. University of Manitoba; 2020. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1993/34596.
Council of Science Editors:
Klassen W. All-optical Cs Magnetometry system for a neutron electric dipole moment experiment: All-Optical Cs Magnetometry System for a Neutron Electric Dipole Moment Experiment. [Masters Thesis]. University of Manitoba; 2020. Available from: http://hdl.handle.net/1993/34596
Baylor University
5.
Yousefi, Raziyeh.
An investigation of electrostatic properties of dust grains in a complex plasma.
Degree: PhD, Baylor University. Dept. of Physics., 2015, Baylor University
URL: http://hdl.handle.net/2104/9576
► Explanation of the electrostatic behavior of dust grains in complex plasmas requires a knowledge of their basic properties such as electrostatic charge and dipole moment.…
(more)
▼ Explanation of the electrostatic behavior of dust grains in complex plasmas requires a knowledge of their basic properties such as electrostatic charge and
dipole moment. While the measurement of the charge on symmetric dust grains in laboratory experiments has been performed, dust grains in astrophysical and laboratory plasmas are not necessarily spherically symmetric: the grains are typically elongated or aggregates consisting of many small subunits. Many of the previous works on grain charge assume a uniform plasma condition, though in the sheath of the rf discharge, there is an ion ow toward the boundary of the plasma. In this study, we present models for these complex plasma environments, where dust aggregates and dust structures formed in a laboratory plasma. Their basic properties are investigated experimentally and by employing computer models examining 3D structures of aggregates under di erent plasma conditions. The results support the previous experimental and numerical predictions for aggregates in these environments.
Advisors/Committee Members: Matthews, Lorin Swint. (advisor).
Subjects/Keywords: Dusty plasma. Aggregate. Ion flow. Electric charge. Electric dipole moment.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yousefi, R. (2015). An investigation of electrostatic properties of dust grains in a complex plasma. (Doctoral Dissertation). Baylor University. Retrieved from http://hdl.handle.net/2104/9576
Chicago Manual of Style (16th Edition):
Yousefi, Raziyeh. “An investigation of electrostatic properties of dust grains in a complex plasma.” 2015. Doctoral Dissertation, Baylor University. Accessed April 10, 2021.
http://hdl.handle.net/2104/9576.
MLA Handbook (7th Edition):
Yousefi, Raziyeh. “An investigation of electrostatic properties of dust grains in a complex plasma.” 2015. Web. 10 Apr 2021.
Vancouver:
Yousefi R. An investigation of electrostatic properties of dust grains in a complex plasma. [Internet] [Doctoral dissertation]. Baylor University; 2015. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2104/9576.
Council of Science Editors:
Yousefi R. An investigation of electrostatic properties of dust grains in a complex plasma. [Doctoral Dissertation]. Baylor University; 2015. Available from: http://hdl.handle.net/2104/9576
Johannes Gutenberg Universität Mainz
6.
Zenner, Johannes.
The search for the neutron electric dipole moment.
Degree: 2013, Johannes Gutenberg Universität Mainz
URL: http://ubm.opus.hbz-nrw.de/volltexte/2013/3500/
► A permanent electric dipole moment of the neutron violates time reversal as well as parity symmetry. Thus it also violates the combination of charge conjugation…
(more)
▼ A permanent electric dipole moment of the neutron violates time reversal as well as parity symmetry. Thus it also violates the combination of charge conjugation and parity symmetry if the combination of all three symmetries is a symmetry of nature. The violation of these symmetries could help to explain the observed baryon content of the Universe. The prediction of the Standard Model of particle physics for the neutron electric dipole moment is only about 10e−32 ecm. At the same time the combined violation of charge conjugation and parity symmetry in the Standard Model is insufficient to explain the observed baryon asymmetry of the Universe. Several extensions to the Standard Model can explain the observed baryon asymmetry and also predict values for the neutron electric dipole moment just below the current best experimental limit of d n < 2.9e−26 ecm, (90% C.L.) that has been obtained by the Sussex-RAL-ILL collaboration in 2006. The very same experiment that set the current best limit on the electric dipole moment has been upgraded and moved to the Paul Scherrer Institute. Now an international collaboration is aiming at increasing the sensitivity for an electric dipole moment by more than an order of magnitude. This thesis took place in the frame of this experiment and went along with the commissioning of the experiment until first data taking. After a short layout of the theoretical background in chapter 1, the experiment with all subsystems and their performance are described in detail in chapter 2. To reach the goal sensitivity the control of systematic errors is as important as an increase in statistical sensitivity. Known systematic efects are described and evaluated in chapter 3. During about ten days in 2012, a first set of data was measured with the experiment at the Paul Scherrer Institute. An analysis of this data is presented in chapter 4, together with general tools developed for future analysis eforts. The result for the upper limit of an electric dipole moment of the neutron is |dn| ≤ 6.4e−25 ecm (95%C.L.). Chapter 5 presents investigations for a next generation experiment, to build electrodes made partly from insulating material. Among other advantages, such electrodes would reduce magnetic noise, generated by the thermal movement of charge carriers. The last Chapter summarizes this work and gives an outlook.
Subjects/Keywords: Ultracold neutrons, CP violation, neutron electric dipole moment; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zenner, J. (2013). The search for the neutron electric dipole moment. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2013/3500/
Chicago Manual of Style (16th Edition):
Zenner, Johannes. “The search for the neutron electric dipole moment.” 2013. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed April 10, 2021.
http://ubm.opus.hbz-nrw.de/volltexte/2013/3500/.
MLA Handbook (7th Edition):
Zenner, Johannes. “The search for the neutron electric dipole moment.” 2013. Web. 10 Apr 2021.
Vancouver:
Zenner J. The search for the neutron electric dipole moment. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2013. [cited 2021 Apr 10].
Available from: http://ubm.opus.hbz-nrw.de/volltexte/2013/3500/.
Council of Science Editors:
Zenner J. The search for the neutron electric dipole moment. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2013. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2013/3500/
Harvard University
7.
Gurevich, Yulia.
Preliminary Measurements for an Electron EDM Experiment in ThO.
Degree: PhD, Physics, 2011, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10121983
► The ACME collaboration aims to measure the eEDM via Ramsey spectroscopy of a cryogenic beam of ThO molecules in their metastable H state. This thesis…
(more)
▼ The ACME collaboration aims to measure the eEDM via Ramsey spectroscopy of a cryogenic beam of ThO molecules in their metastable H state. This thesis describes the launch of this new experimental effort. A set of diode lasers has been built to address all the necessary ThO transitions. The laser frequencies were stabilized to a stable reference laser via a (Fabry-P\acute{e}rot) transfer cavity. A measurement of the magnetic dipole moment of the H state has been performed that is complementary to a previous measurement by the collaboration. This value is important for determining the sensitivity of the H state to magnetic fields, which can be a source of noise and systematic errors in the eEDM measurement. Experimental efforts to prepare the coherent superposition of the (M = ±1) Zeeman sublevels in the H,J = 1 state that is the starting point of the eEDM experiment using transitions to the G state resulted in a better understanding of transitions between (Ω)-doublet states in an electric field. This led to a new technique for normalizing out shot-to-shot fluctuations in the molecular beam flux, which has also been demonstrated experimentally.
Physics
Advisors/Committee Members: Gabrielse, Gerald (advisor), Doyle, John (committee member), Walsworth, Ronald (committee member).
Subjects/Keywords: electron electric dipole moment; thorium monoxide; atomic physics; molecular physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gurevich, Y. (2011). Preliminary Measurements for an Electron EDM Experiment in ThO. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:10121983
Chicago Manual of Style (16th Edition):
Gurevich, Yulia. “Preliminary Measurements for an Electron EDM Experiment in ThO.” 2011. Doctoral Dissertation, Harvard University. Accessed April 10, 2021.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:10121983.
MLA Handbook (7th Edition):
Gurevich, Yulia. “Preliminary Measurements for an Electron EDM Experiment in ThO.” 2011. Web. 10 Apr 2021.
Vancouver:
Gurevich Y. Preliminary Measurements for an Electron EDM Experiment in ThO. [Internet] [Doctoral dissertation]. Harvard University; 2011. [cited 2021 Apr 10].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10121983.
Council of Science Editors:
Gurevich Y. Preliminary Measurements for an Electron EDM Experiment in ThO. [Doctoral Dissertation]. Harvard University; 2011. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10121983
Harvard University
8.
Spaun, Benjamin Norman.
A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment.
Degree: PhD, Physics, 2014, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274348
► The Standard Model of particle physics is wonderfully successful in its predictions but known to be incomplete. It fails to explain the existence of dark…
(more)
▼ The Standard Model of particle physics is wonderfully successful in its predictions but known to be incomplete. It fails to explain the existence of dark matter, and the fact that a universe made of matter survived annihilation with antimatter following the big bang. Extensions to the Standard Model, such as weak-scale Supersymmetry, provide explanations for some of these phenomena by asserting the existence of new particles and new interactions that break symmetry under time-reversal. These theories predict a small, yet potentially measurable electron electric dipole moment (EDM), de, that also violates time-reversal symmetry. Here, we report a new measurement of the electron EDM in the polar molecule thorium monoxide (ThO): de = -2.1 ± 3.7stat ± 2.5syst x 10-29 e cm, which corresponds to an upper limit of |de| <8.7 x 10-29 e cm with 90 % confidence. This is more than an order of magnitude improvement in sensitivity compared to the previous limit. This result sets strong constraints on new physics at an energy scale (TeV) at least as high as that directly probed by the Large Hadron Collider. The unprecedented precision of this EDM measurement was achieved by using the high effective electric field within ThO to greatly magnify the EDM signal. Valence electrons travel relativistically near the heavy thorium nucleus and experience an effective electric field of about 100 GV/cm, millions of times larger than any static laboratory field. The reported measurement is a combination of millions of separate EDM measurements performed with billions of ThO molecules in a cold, slow buffer gas beam. Other features of ThO, such as a near-zero magnetic moment and high electric polarizability, allow potential systematic errors to be drastically suppressed and ensure the accuracy of our measurement.
Physics
Advisors/Committee Members: Gabrielse, Gerald (advisor), Huth, John (committee member), Greiner, Markus (committee member).
Subjects/Keywords: Atomic physics; Particle physics; Electric Dipole Moment; Precision Measurement
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Spaun, B. N. (2014). A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274348
Chicago Manual of Style (16th Edition):
Spaun, Benjamin Norman. “A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment.” 2014. Doctoral Dissertation, Harvard University. Accessed April 10, 2021.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274348.
MLA Handbook (7th Edition):
Spaun, Benjamin Norman. “A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment.” 2014. Web. 10 Apr 2021.
Vancouver:
Spaun BN. A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment. [Internet] [Doctoral dissertation]. Harvard University; 2014. [cited 2021 Apr 10].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274348.
Council of Science Editors:
Spaun BN. A Ten-Fold Improvement to the Limit of the Electron Electric Dipole Moment. [Doctoral Dissertation]. Harvard University; 2014. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274348
University of Manitoba
9.
Rebenitsch, Lori.
Detecting high rates of ultracold neutrons and thermal neutron production.
Degree: Physics and Astronomy, 2018, University of Manitoba
URL: http://hdl.handle.net/1993/33563
► The first phase of the TRIUMF ultracold advanced neutron source (TUCAN) is operational at TRIUMF in Vancouver, Canada, with the second phase scheduled to be…
(more)
▼ The first phase of the TRIUMF ultracold advanced neutron source (TUCAN) is operational at TRIUMF in Vancouver, Canada, with the second phase scheduled to be completed in 2020. The first proposed experiment with the source is a neutron
electric dipole moment (nEDM) measurement. Preparing the experiment requires building the nEDM experimental cell, containing high voltage, magnetic fields, B
0 and B
1 coils, magnetic shielding to run the Ramsey cycle; a prototype detection system; and commissioning the TUCAN source. This thesis focuses on measurements that characterize the prototype UCN counter, as well as the thermal neutron flux measurement around TUCAN, as part of the source commissioning.
The UCN counter is a \ce{
6Li}-doped glass detector, designed for high rates of UCN. The detector efficiency is comparable to the GEM-based Cascade-U detector at the UCN source at the Paul Scherrer Institute. Comparing the \ce{
6Li} detector to simulation gave a neutron efficiency of 99.5 ± 0.5~% with a background contamination of 0.3 ± 0.1~%. The total efficiency of this detector was measured to be 89.7
+1.3-1.9~%.
The thermal neutron measurement used Au and Cd-covered Au foils to measure the thermal and colder neutron flux around TUCAN at different temperatures. This measurement was conducted at TRIUMF during the initial commissioning of neutron production. There were some large discrepancies between the measured data and simulation and also between measurements with the same settings. A number of discrepancies were found to be due to differences between the experimental set up and the model. Modeling graphite, in particular, is limited due to the wide variability of the structure of graphite and is known to vary up to 40% from the measurement depending on structural factors. The largest discrepancy was due to difficulties in steering the proton beam onto the tungsten target. However, none of the simulated effects were large enough to cover the measured results, suggesting there was a systematic effect that was not well-understood. While thermal and colder neutron flux was measured, the amount varied too much from irradiation run to irradiation run to determine the flux with consistency.
Advisors/Committee Members: Jamieson, Blair (Physics and Astronomy) (supervisor), Gwinner, Gerald (Physics and Astronomy) Mammei, Juliette (Physics and Astronomy) Shafai, Cyrus(Electrical and Computer Engineering) Dick, Rainer (University of Saskatchewan) (examiningcommittee).
Subjects/Keywords: Physics; Neutrons; Detection; TRIUMF; nEDM; UCN; Electric dipole moment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rebenitsch, L. (2018). Detecting high rates of ultracold neutrons and thermal neutron production. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rebenitsch, Lori. “Detecting high rates of ultracold neutrons and thermal neutron production.” 2018. Thesis, University of Manitoba. Accessed April 10, 2021.
http://hdl.handle.net/1993/33563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rebenitsch, Lori. “Detecting high rates of ultracold neutrons and thermal neutron production.” 2018. Web. 10 Apr 2021.
Vancouver:
Rebenitsch L. Detecting high rates of ultracold neutrons and thermal neutron production. [Internet] [Thesis]. University of Manitoba; 2018. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1993/33563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rebenitsch L. Detecting high rates of ultracold neutrons and thermal neutron production. [Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/33563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manitoba
10.
Andalib, Taraneh.
Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF.
Degree: Physics and Astronomy, 2019, University of Manitoba
URL: http://hdl.handle.net/1993/33785
► The existence of a non-zero neutron electric dipole moment (nEDM) confirms the theoretical models of Physics beyond the Standard Model which provide extra sources of…
(more)
▼ The existence of a non-zero neutron
electric dipole moment (nEDM) confirms the theoretical models of Physics beyond the Standard Model which provide extra sources of CP violation. Based on Sakharov Criteria, CP violation is one of the main ingredients to create the baryon asymmetry in the universe. The current upper limit of the neutron EDM was found to be 3.0×10^(−26) e·cm, which is below the theoretical models predictions. As a result, there is a worldwide quest to find a finite nEDM. The typical experimental method to measure the nEDM uses the ultracold neutrons (UCN) and employs the Ramsey method of separated oscillatory fields. In this method, the Larmor precession frequency of UCN is measured in the presence of aligned
Electric and Magnetic fields orientations. Such precision measurements require high UCN statistics and very stable and homogeneous magnetic fields. The work presented in this
thesis is focused on the magnetic field and UCN studies for the future nEDM measurement at TRIUMF.
The TUCAN (TRIUMF UltraCold Advanced Neutron source) collaboration’s goal is to measure the nEDM to the sensitivity level of 10^(−27) . For this measurement, the < 1 pT magnetic stability requirement could be met by using magnetic shields with high magnetic permeability (μ) to reduce the external magnetic fields. However, external sources such as ambient temperature fluctuations could give rise to a change in the magnetic properties such as μ. The result of the temperature dependence of μ measurements and related simulations are presented here. These measurements set a limit on the temperature control level for the future nEDM measurement at TRIUMF.
The TUCAN collaboration’s goal is to design a next-generation UCN source to increase the UCN statistics and reach the required nEDM sensitivity. In 2016, the vertical UCN source that was previously developed at RCNP was shipped to TRIUMF. In 2017, we significantly improved the control system for data acquisition and conduced the first UCN experiments.The status of the current UCN facility at TRIUMF and the result of the first UCN production tests are presented here.
Advisors/Committee Members: Martin, Jeffery (Physics and Astronomy), Lin, Francis (Physics and Astronomy) (examiningcommittee), Gericke, Michael (Physics and Astronomy) (examiningcommittee), Wiebe, Christopher (Chemistry) (examiningcommittee), Crawford, Christopher (University of Kentucky) (examiningcommittee).
Subjects/Keywords: Subatomic Physics; Ultracold Neutrons; Neutron Electric Dipole Moment; TRIUMF; Magnetic Fields
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Andalib, T. (2019). Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33785
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Andalib, Taraneh. “Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF.” 2019. Thesis, University of Manitoba. Accessed April 10, 2021.
http://hdl.handle.net/1993/33785.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Andalib, Taraneh. “Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF.” 2019. Web. 10 Apr 2021.
Vancouver:
Andalib T. Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF. [Internet] [Thesis]. University of Manitoba; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1993/33785.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Andalib T. Magnetic fields and ultracold neutron production: studies towards the neutron electric dipole moment experiment at TRIUMF. [Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/33785
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
11.
McCann, Michael Andrew.
Magnetometery for cryoEDM.
Degree: PhD, 2012, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:0a503382-d356-4fd6-b877-65bd00df331b
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588405
► The existence of the matter in the universe is still an unsolved puzzle. After the Big Bang, both matter and antimatter should have been created…
(more)
▼ The existence of the matter in the universe is still an unsolved puzzle. After the Big Bang, both matter and antimatter should have been created in equal amounts, and subsequently annihilated. The leading theories to explain the existence of matter require an imbalance in the production of matter and antimatter in the early universe. This in turn requires CP violation, an asymmetry of the laws of physics between matter and antimatter. cryoEDM is designed to explore the total amount of CP violation and resolve this issue. cryoEDM is a next-generation neutron electric dipole moment search in a commissioning phase of development at the Institut Laue-Langevin, Grenoble. A critical requirement of EDM searches is knowledge of the magnetic environment. This work is concerned with the development, implementation, and performance of the currently operating magnetometry system based on SQUID magnetometers. An analysis scheme to provide magnetometry data over the volume occupied by the neutrons, from measurements using the available magnetometers, is developed. An updated method to calibrate the magnetometers using internal sources of magnetic fields is presented, and found to give good agreement with independent measurements. A new method of calibration using the neutrons as a reference is discussed, and tests on an example arrangement are shown to be promising. Algorithms for detecting and correcting for hardware induced artefacts in the data are produced, and demonstrated to reconstruct the field with good agreement in all but the noisiest environments. A software framework is developed to combine these into a real-time analysis that provides feedback and diagnostics to the experiment. Using this new system the resolution of the magnetometers installed in cryoEDM is found to be limited by the environmental noise, and would give a false EDM signal that is greater than the statistical uncertainty in neutron counting. However, the resolution has been somewhat artificially limited to reduce the susceptibility to the RF interference present. This still allows the magnetometry to act as a useful diagnostic tool on any issues in the current magnetic environment, even if in a sub-optimal configuration. For example, investigation of the magnetic shielding of the experiment finds a reduction in the shielding relative to the design, a situation which is being addressed with the design of additional shielding. Once this shielding is installed the resolution of the magnetometers will improve as well as the slew rate of the SQUIDs, which is found to be lower than the 47,mu extup{Ts}-1 required to measure AC fields applied during a measurement. The current system can also determine sources of magnetic perturbations created within the experiment, which will require addressing before a full EDM run can be performed. For example, cryogenic effects are observed to occur approximately hourly causing large shifts in the magnetic field. Also operation of valves controlling the flow of neutrons around the experiment are found to produce both…
Subjects/Keywords: 538; Particle physics; cryoEDM; nEDM; magnetometry; electric dipole moment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
McCann, M. A. (2012). Magnetometery for cryoEDM. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:0a503382-d356-4fd6-b877-65bd00df331b ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588405
Chicago Manual of Style (16th Edition):
McCann, Michael Andrew. “Magnetometery for cryoEDM.” 2012. Doctoral Dissertation, University of Oxford. Accessed April 10, 2021.
http://ora.ox.ac.uk/objects/uuid:0a503382-d356-4fd6-b877-65bd00df331b ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588405.
MLA Handbook (7th Edition):
McCann, Michael Andrew. “Magnetometery for cryoEDM.” 2012. Web. 10 Apr 2021.
Vancouver:
McCann MA. Magnetometery for cryoEDM. [Internet] [Doctoral dissertation]. University of Oxford; 2012. [cited 2021 Apr 10].
Available from: http://ora.ox.ac.uk/objects/uuid:0a503382-d356-4fd6-b877-65bd00df331b ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588405.
Council of Science Editors:
McCann MA. Magnetometery for cryoEDM. [Doctoral Dissertation]. University of Oxford; 2012. Available from: http://ora.ox.ac.uk/objects/uuid:0a503382-d356-4fd6-b877-65bd00df331b ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588405
University of Washington
12.
Chen, Yi.
Axion-like Dark Matter Detection with Mercury-199 Atoms.
Degree: PhD, 2019, University of Washington
URL: http://hdl.handle.net/1773/43441
► The objective of this dissertation is to search for axion dark matter through the coupling between the axion field and the electric dipole moment(EDM) of…
(more)
▼ The objective of this dissertation is to search for axion dark matter through the coupling between the axion field and the
electric dipole moment(EDM) of mercury-199 atoms. If the axion is the significant fraction of dark matter, the coupling leads to a time-varying nuclear EDM that oscillates at the frequency proportional to the axion mass, m
a. We use the data that measures the static EDM of
199Hg atoms to look for a simple sinusoidal signal on the top of the static EDM value. The Lomb-Scargle periodogram, as a power spectrum estimator, allows us to analyze our unequally spaced EDM data in time. With two different approaches both with and without error weighting, they give a consistent result on no detection of dark matter. The most significant peak among the four EDM periodograms has a false alarm probability of 31% calculated with the Bootstrap method. The magnitude of the maximum peak can be generated by injecting a sinusoidal signal with the amplitude of 1.81 × 10
-29 e ∙ cm. The smallest periodic signal our measurement can detect as the maximum peak in the periodogram with 95% confidence in the frequency range of 0 to 6.17 × 10
-4 Hz is 2.3 × 10
-29 e ∙ cm. The static EDM of
199Hg by itself is an important topic. This thesis will only briefly mention it and mainly cover the parts that are relevant to time-varying EDM analysis.
Advisors/Committee Members: Heckel, Blayne R (advisor).
Subjects/Keywords: Bootstrap; electric dipole moment; periodogram; time-varying EDM; Atomic physics; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Y. (2019). Axion-like Dark Matter Detection with Mercury-199 Atoms. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/43441
Chicago Manual of Style (16th Edition):
Chen, Yi. “Axion-like Dark Matter Detection with Mercury-199 Atoms.” 2019. Doctoral Dissertation, University of Washington. Accessed April 10, 2021.
http://hdl.handle.net/1773/43441.
MLA Handbook (7th Edition):
Chen, Yi. “Axion-like Dark Matter Detection with Mercury-199 Atoms.” 2019. Web. 10 Apr 2021.
Vancouver:
Chen Y. Axion-like Dark Matter Detection with Mercury-199 Atoms. [Internet] [Doctoral dissertation]. University of Washington; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1773/43441.
Council of Science Editors:
Chen Y. Axion-like Dark Matter Detection with Mercury-199 Atoms. [Doctoral Dissertation]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/43441
University of Illinois – Urbana-Champaign
13.
Rao, Thomas.
Transport of 3He for the nEDM experiment at the SNS.
Degree: PhD, Physics, 2019, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/105568
► The neutron electric dipole moment (nEDM) experiment at the Spallation Neutron Source (SNS) will measure the electric dipole moment (EDM) of the neutron with a…
(more)
▼ The neutron
electric dipole moment (nEDM) experiment at the Spallation Neutron Source (SNS) will measure the
electric dipole moment (EDM) of the neutron with a precision of 5.4 × 10
-28\,{e∙ cm}. This experiment utilizes polarized 3He in superfluid 4He to detect neutron precession in a 30 mG magnetic field and 75 kV/cm
electric field via the spin dependent reaction {n}{+
3He} → {p}{+
3H}+764{\,KeV}. Polarized 3He is produced by an atomic beam source (ABS) and incident on a free surface of superfluid helium in the “injection volume”. A film burner and baffle is used to contain superfluid film climbing the walls of the volume, preventing helium vapor from scattering the incoming beam. From the injection volume 3He diffuses into an intermediate volume. From this point heat flush is used to transport the polarized 3He into and (once depolarized) out of the measurement cells.
The heat flush mechanism transports the 3He by utilizing collisions between phonons, generated in the superfluid helium by establishing a thermal gradient, and the 3He. Since phonons have no spin these collisions preserve the polarization of the 3He. A test of the heat flush mechanism has been conducted using a capacitive pressure sensor to measure the change in concentration resulting from using heat flush to transport 3He from one volume of superfluid to another connected by a small diameter pipe. The system initially had an uniform 3He concentration of approximately 0.8 ppm. This test demonstrates that heat flush can be used to transport 3He in the temperature range of 350-550 mK, as well as providing a measurement of the phonon dominated diffusion constant of 3He in this temperature region. A value of D=\frac{2.56
-.09+.14}{T
7}f(T) was found. The measured constant is 3 times larger than what is calculated by Baym, Beck and Pethick in [27, 28]. Also it has been demonstrated that a film burner can be used to control superfluid film, and prevent vapor that would otherwise scatter the polarized 3He beam from the ABS into the injection volume. At 310 mK, 3.4 mW is required to contain the vapor within the baffle.
Advisors/Committee Members: Beck, Douglas H (advisor), Peng, Jen-Chieh (Committee Chair), Baym, Gordon (committee member), Giannetta, Russell (committee member).
Subjects/Keywords: Helium 3; neutron; electric dipole moment; heat flush
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rao, T. (2019). Transport of 3He for the nEDM experiment at the SNS. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/105568
Chicago Manual of Style (16th Edition):
Rao, Thomas. “Transport of 3He for the nEDM experiment at the SNS.” 2019. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 10, 2021.
http://hdl.handle.net/2142/105568.
MLA Handbook (7th Edition):
Rao, Thomas. “Transport of 3He for the nEDM experiment at the SNS.” 2019. Web. 10 Apr 2021.
Vancouver:
Rao T. Transport of 3He for the nEDM experiment at the SNS. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2142/105568.
Council of Science Editors:
Rao T. Transport of 3He for the nEDM experiment at the SNS. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2019. Available from: http://hdl.handle.net/2142/105568
University of Kentucky
14.
Aleksandrova, Alina.
Magnetic Field Monitoring in the SNS Neutron EDM Experiment.
Degree: 2019, University of Kentucky
URL: https://uknowledge.uky.edu/physastron_etds/68
► It is a well known fact that the visible universe is made almost entirely of baryonic matter. Yet, this is also one of the greatest…
(more)
▼ It is a well known fact that the visible universe is made almost entirely of baryonic matter. Yet, this is also one of the greatest puzzles that physicists are trying to solve: Where did all of this matter come from in the first place? The Standard Model (SM) of particle physics predicts a baryon asymmetry that is much smaller than what is observed in nature. In order to try and explain this discrepancy, Sakharov (1967) postulated three necessary conditions for baryogenesis in the early universe. One of these is the requirement that charge conjugation (C) and the product of C and parity (P) symmetries are violated. Because the SM fails to generate the observed baryon asymmetry, additional sources of CP violation are needed in order to help reconcile theory and observation. Thus, physicists have been looking for extensions to the SM in search of an answer. The presence of a neutron Electric Dipole Moment (nEDM) would signal a new source of CP violation. A non-vanishing nEDM would provide evidence for the breaking of both parity (P) and time-reversal symmetry (T). Because CPT symmetry is assumed to be conserved and has not been found to be broken, this would signal CP violation.
To look for an nEDM, stored ultracold neutrons are placed in parallel and anti-parallel magnetic and electric fields and the Larmor precession frequency is carefully measured. A difference in the precession frequency of the neutrons in the two states of the fields would signal the existence of an nEDM. The current upper limit of the nEDM was set by the RAL-Sussex-ILL collaboration and stands at dn < 3.0x10-26 e cm (90% CL). Currently a new cryogenic apparatus is under construction at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL) which aims to reduce the current upper limit by two orders of magnitude.
A central problem to all neutron EDM experiments is the generation of a highly uniform and stable magnetic field. Because the suppression of systematic effects that arise from magnetic field nonuniformities and temporal drifts is vital to the success of these experiments, it is important to have the ability to precisely control and monitor the magnetic field gradients inside of the experimental volume. However, it is not always possible to measure the field gradients within the region of interest directly. To remedy this issue in the SNS nEDM experiment, a field monitoring system has been designed and tested that will allow for the reconstruction of the field gradients inside of the fiducial volume using noninvasive measurements of the field components at discrete locations external to this volume. This document will outline the theoretical framework of our method and present the results of experimental and simulated studies performed and the engineering design for such a field monitoring system.
Subjects/Keywords: neutrons; electric dipole moment; magnetic field; Nuclear; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Aleksandrova, A. (2019). Magnetic Field Monitoring in the SNS Neutron EDM Experiment. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/physastron_etds/68
Chicago Manual of Style (16th Edition):
Aleksandrova, Alina. “Magnetic Field Monitoring in the SNS Neutron EDM Experiment.” 2019. Doctoral Dissertation, University of Kentucky. Accessed April 10, 2021.
https://uknowledge.uky.edu/physastron_etds/68.
MLA Handbook (7th Edition):
Aleksandrova, Alina. “Magnetic Field Monitoring in the SNS Neutron EDM Experiment.” 2019. Web. 10 Apr 2021.
Vancouver:
Aleksandrova A. Magnetic Field Monitoring in the SNS Neutron EDM Experiment. [Internet] [Doctoral dissertation]. University of Kentucky; 2019. [cited 2021 Apr 10].
Available from: https://uknowledge.uky.edu/physastron_etds/68.
Council of Science Editors:
Aleksandrova A. Magnetic Field Monitoring in the SNS Neutron EDM Experiment. [Doctoral Dissertation]. University of Kentucky; 2019. Available from: https://uknowledge.uky.edu/physastron_etds/68
Harvard University
15.
Hess, Paul William.
Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment.
Degree: PhD, Physics, 2014, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274320
► The ACME collaboration has completed a measurement setting a new upper limit on the size of the electron's permanent electric dipole moment (EDM). The existence…
(more)
▼ The ACME collaboration has completed a measurement setting a new upper limit on the size of the electron's permanent electric dipole moment (EDM). The existence of the EDM is well motivated by theories extending the standard model of particle physics, with predicted sizes very close to the current experimental limit. The new limit was set by measuring spin precession within the metastable H state of the polar molecule thorium monoxide (ThO). A particular focus here is on the automated data acquisition system developed to search for a precession phase odd under internal and external reversal of the electric field. Automated switching of many different experimental controls allowed a rapid diagnosis of major systematics, including the dominant systematic caused by non-reversing electric fields and laser polarization gradients. Polarimetry measurements made it possible to quantify and minimize the polarization gradients in our state preparation and probe lasers. Three separate measurements were used to determine the electric field that did not reverse when we tried to switch the field direction. The new bound of |de|< 8.7 × 10-29 e cm is over an order of magnitude smaller than previous limits, and strongly limits T-violating physics at TeV energy scales.
Physics
Advisors/Committee Members: Gabrielse, Gerald (advisor), Morii, Masahiro (committee member), Lukin, Mikhail (committee member).
Subjects/Keywords: Atomic physics; Particle physics; Electric Dipole Moment; Electron EDM; First Generation; Systematics; ThO; Thorium Monoxide
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hess, P. W. (2014). Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274320
Chicago Manual of Style (16th Edition):
Hess, Paul William. “Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment.” 2014. Doctoral Dissertation, Harvard University. Accessed April 10, 2021.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274320.
MLA Handbook (7th Edition):
Hess, Paul William. “Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment.” 2014. Web. 10 Apr 2021.
Vancouver:
Hess PW. Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment. [Internet] [Doctoral dissertation]. Harvard University; 2014. [cited 2021 Apr 10].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274320.
Council of Science Editors:
Hess PW. Improving the Limit on the Electron EDM: Data Acquisition and Systematics Studies in the ACME Experiment. [Doctoral Dissertation]. Harvard University; 2014. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274320
16.
A. Merli.
SEARCH FOR CP VIOLATION IN BARYONS.
Degree: 2019, Università degli Studi di Milano
URL: http://hdl.handle.net/2434/656029
► In the past, flavour physics has driven indirect discoveries of new particles through precision measurements of other processes before the actual particles could be produced…
(more)
▼ In the past, flavour physics has driven indirect discoveries of new particles through precision measurements of other processes before the actual particles could be produced directly.
For example the discovery of the differences in the behaviour of matter and antimatter, CP violation (CPV), has led to the explanation of flavour mixing with three families of quarks; the absence of the decay{KL}{mumu} decay drove the prediction of the cquark quark trough the GIM mechanism; the measurement of the Bd mixing allowed for the prediction of high mass of the quark quark.
The asymmetry between matter and antimatter behaviour is related to the violation of the CP symmetry, where C and P are the charge-conjugation and parity operators. CPV is accommodated in the Standard Model (SM) of particle physics by the Cabibbo-Kobayashi-Maskawa (CKM) mechanism that describes the transitions between up- and down-type quarks, in which quark decays proceed by the emission of a virtual W boson and where the phases of the couplings change sign between quarks and antiquarks.
A significant excess of CPV with respect to the theoretical predictions would represent a proof of new physics beyond the SM (BSM).
The experiments
BaBar and Belle have systematically studied the Bd and Bpm mesons. The heavy baryon sector (ie containing the quark quark) still remains largely unexplored.
Given the large production of heavy baryons at lhcb, precision measurements have become possible in this field. Moreover, the interest of the scientific community is growing on heavy baryons: the last measurement on lvertVub
vert in the channel decay{Lb}{protonmun
eub} and the discovery of the pentaquark in the channel decay{Lb}{jpsiprotonKm} are only few relevant examples.
Actually the theory describes very well, within the experimental error, the CPV mechanism so far observed in meson decays. Since in the mesons and baryons decays the quark transitions are the same, the CKM theory predicts CPV also in the baryon sector, which has never been observed so far. It is important to measure CPV also in baryons to check if the mechanisms through which it is generated is the same as mesons.
We know that CPV is a key ingredient for baryogenesis, but the CKM mechanism cannot explain it quantitatively. New sources of CPV are necessary to explain baryogenesis.
The search for
electric dipole moment (EDM) of baryons represents a powerful probe for new sources of CPV and new physics beyond the Standard Model. In particular, it is sensitive to flavour diagonal CPV contributions that are predicted to be minuscule in the SM.
The existence of permanent EDMs requires
the violation of parity (P) and time reversal (T) symmetries and thus, relying on the validity of the CPT theorem,
the violation of CP symmetry.
These measurements are not foreseen in the physics program of the lhcb experiment dedicated to the study of the CP violation of heavy hadron via flavour-changing observables, and require new instrumentation.
Advisors/Committee Members: supervisor: N. Neri, coordinator: F. Ragusa, RAGUSA, FRANCESCO.
Subjects/Keywords: CP violation; baryons; LHCb; EDM; Electric dipole moment; Settore FIS/01 - Fisica Sperimentale
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Merli, A. (2019). SEARCH FOR CP VIOLATION IN BARYONS. (Thesis). Università degli Studi di Milano. Retrieved from http://hdl.handle.net/2434/656029
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Merli, A.. “SEARCH FOR CP VIOLATION IN BARYONS.” 2019. Thesis, Università degli Studi di Milano. Accessed April 10, 2021.
http://hdl.handle.net/2434/656029.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Merli, A.. “SEARCH FOR CP VIOLATION IN BARYONS.” 2019. Web. 10 Apr 2021.
Vancouver:
Merli A. SEARCH FOR CP VIOLATION IN BARYONS. [Internet] [Thesis]. Università degli Studi di Milano; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2434/656029.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Merli A. SEARCH FOR CP VIOLATION IN BARYONS. [Thesis]. Università degli Studi di Milano; 2019. Available from: http://hdl.handle.net/2434/656029
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
17.
Grau, Matt.
Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.
Degree: PhD, Physics, 2015, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/160
► An electron electric dipole moment (eEDM) directly violates time-reversal symmetry, a fact which has far reaching implications for physics beyond the Standard Model. An…
(more)
▼ An electron
electric dipole moment (eEDM) directly violates time-reversal symmetry, a fact which has far reaching implications for physics beyond the Standard Model. An experiment using trapped molecular ions offers high sensitivity because of the large effective
electric fields and long coherence times that are possible. We demonstrate precision spectroscopy on many trapped HfF+ ions in a radiofrequency quadrupole trap with rotating
electric and magnetic fields. The spectroscopy performed is a Ramsey type experiment between spin states of the metastable
3∆
1 electronic state and has a coherence time exceeding 1 second. We have collected and analyzed over 200 hours of Ramsey spectroscopy data taken under a variety of experimental conditions. We identify several systematic errors that could potentially affect an eEDM measurement and estimate the size of these interloping effects. By collecting data under pairs of conditions where the eEDM has opposing signs (e.g. performing Ramsey spectroscopy on the two Λ-doublets) we are able to take frequency differences that can suppress some of these systematic effects. Although our data set includes runs where we have intentionally varied experimental parameters to study systematic effects, we achieve a 1σ statistical sensitivity of 2.76 × 10
−28 e·cm and place a 1σ upper bound on the size of systematic effects of 2.82 × 10
−28 e·cm. Finally we present a preliminary upper bound on the eEDM of |d
e| < 4.6 × 10
−28 e·cm with 90% confidence.
Advisors/Committee Members: Eric A. Cornell, Jun Ye, John L. Bohn, James K. Thompson, Mathias Weber.
Subjects/Keywords: electron electric dipole moment; precision measurement; trapped ions; Atomic, Molecular and Optical Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Grau, M. (2015). Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/160
Chicago Manual of Style (16th Edition):
Grau, Matt. “Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.” 2015. Doctoral Dissertation, University of Colorado. Accessed April 10, 2021.
https://scholar.colorado.edu/phys_gradetds/160.
MLA Handbook (7th Edition):
Grau, Matt. “Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.” 2015. Web. 10 Apr 2021.
Vancouver:
Grau M. Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Apr 10].
Available from: https://scholar.colorado.edu/phys_gradetds/160.
Council of Science Editors:
Grau M. Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/phys_gradetds/160
University of Illinois – Urbana-Champaign
18.
Sharma, Sarvagya.
NV diamond project for nEDM.
Degree: PhD, Physics, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/100915
► This work presents the research conducted on Nitrogen Vacancy (NV) defects in diamonds for the nEDM experiment which has an operating temperature of 0.5 K.…
(more)
▼ This work presents the research conducted on Nitrogen Vacancy (NV) defects in diamonds for the nEDM experiment which has an operating temperature of 0.5 K. NV defects have been investigated as metrological sensors for measuring both,
electric and magnetic fields at room temperature and also at 4 K.
This thesis discusses different techniques used to probe the NV centers electronic structure. The first, Optically Detected Magnetic Resonance (ODMR) allows us to probe the Zeeman and Stark induced shifts in the ground state through resonant microwave spectroscopy. This technique has helped us study and characterize the response of the NV center to electromagnetic fields. The use of the NV center ensemble as a vector field sensor is also studied using ODMR.
The second technique allows us to build a sensor which also measures the ground state resonances but without the need for microwaves. Instead the quantum phenomenon of electromagnetically induced transparency (EIT) was used. This all-optical method makes diamonds containing NV centers a suitable sensor of the nEDM experiment.
The driven and free spin dynamics of the NV center are also investigated in this work. Studying the evolution of the NV center spin gives us important clues about its spin bath environment and the characteristic time constants over which the NV spin states decay. These time constants set the fundamental limit of the sensitivity for measuring magnetic and
electric fields.
Advisors/Committee Members: Beck, Doug (advisor), Kwiat, Paul (Committee Chair), DeMarco, Brian (committee member), Ceperley, David (committee member).
Subjects/Keywords: Diamond; neutron electric dipole moment; Electrometry; Quantum defect; Magnetometry; Sensing; Nonlinear optics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sharma, S. (2018). NV diamond project for nEDM. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/100915
Chicago Manual of Style (16th Edition):
Sharma, Sarvagya. “NV diamond project for nEDM.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 10, 2021.
http://hdl.handle.net/2142/100915.
MLA Handbook (7th Edition):
Sharma, Sarvagya. “NV diamond project for nEDM.” 2018. Web. 10 Apr 2021.
Vancouver:
Sharma S. NV diamond project for nEDM. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2142/100915.
Council of Science Editors:
Sharma S. NV diamond project for nEDM. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/100915
University of Arizona
19.
Mereghetti, Emanuele.
Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
.
Degree: 2011, University of Arizona
URL: http://hdl.handle.net/10150/202538
► The Effective Field Theory formalism is applied to the study of problems in hadronic and nuclear physics. We develop a framework to study the exclusive…
(more)
▼ The Effective Field Theory formalism is applied to the study of problems in hadronic and nuclear physics. We develop a framework to study the exclusive two-body decays of bottomonium into two charmed mesons and apply it to study the decays of the C-even bottomonia. Using a sequence of effective field theories, we take advantage of the separation between the scales contributing to the decay processes, 2m(b) ≫ m(c) ≫∧(QCD). We prove that, at leading order in the EFT power counting, the decay rate factorizes into the convolution of two perturbative matching coefficients and three non-perturbative matrix elements, one for each hadron. We calculate the relations between the decay rate and non-perturbative bottomonium and D-meson matrix elements at leading order, with next-to-leading log resummation. The phenomenological implications of these relations are discussed. At lower energies, we use Chiral Perturbation Theory and nuclear EFTs to set up a framework for the study of time reversal (T) symmetry in one- and few-nucleon problems. We consider T violation from the QCD θ term and from all the possible dimension 6 operators, expressed in terms of light quarks, gluons and photons, that can be added to the Standard Model Lagrangian. We construct the low energy chiral Lagrangian stemming from different TV sources, and derive the implications for the nucleon
Electric Dipole Form Factor and the deuteron T violating electromagnetic Form Factors. Finally, with an eye to applications to nuclei with A ≥ 2, we construct the T violating nucleon-nucleon potential from different sources of T violation.
Advisors/Committee Members: Fleming, Sean P (advisor), van Kolck, Bira (committeemember), Su, Shufang (committeemember), Rutherfoord, John (committeemember), Touissant, Doug (committeemember), Fleming, Sean P. (committeemember).
Subjects/Keywords: electric dipole moment;
heavy mesons;
quarkonium;
T violation;
Physics;
chiral perturbation theory;
deuteron
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mereghetti, E. (2011). Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/202538
Chicago Manual of Style (16th Edition):
Mereghetti, Emanuele. “Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
.” 2011. Doctoral Dissertation, University of Arizona. Accessed April 10, 2021.
http://hdl.handle.net/10150/202538.
MLA Handbook (7th Edition):
Mereghetti, Emanuele. “Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
.” 2011. Web. 10 Apr 2021.
Vancouver:
Mereghetti E. Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
. [Internet] [Doctoral dissertation]. University of Arizona; 2011. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10150/202538.
Council of Science Editors:
Mereghetti E. Application of Effective Field Theories to Problems in Nuclear and Hadronic Physics
. [Doctoral Dissertation]. University of Arizona; 2011. Available from: http://hdl.handle.net/10150/202538
University of Kentucky
20.
Dadisman, James Ryan.
MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS.
Degree: 2018, University of Kentucky
URL: https://uknowledge.uky.edu/physastron_etds/53
► Charge-Conjugation (C) and Charge-Conjugation-Parity (CP) Violation is one of the three Sakharov conditions to explain via baryogenesis the observed baryon asymmetry of the universe (BAU).…
(more)
▼ Charge-Conjugation (C) and Charge-Conjugation-Parity (CP) Violation is one of the three Sakharov conditions to explain via baryogenesis the observed baryon asymmetry of the universe (BAU). The Standard Model of particle physics (SM) contains sources of CP violation, but cannot explain the BAU. This motivates searches for new physics beyond the standard model (BSM) which address the Sakharov criteria, including high-precision searches for new sources of CPV in systems for which the SM contribution is small, but larger effects may be present in BSM theories. A promising example is the search for the electric dipole moment of the neutron (nEDM), which is a novel system to observe CPV due to the initial and final state being identical. A non-zero measurement necessarily requires violation of P and T discrete symmetries; invoking CPT invariance requires that CP is violated. There are BSM theories which predict a magnitude for the nEDM larger than SM predictions, so that such studies are beneficial at setting constraints on new physics. The current experimental limit of dn < 3.0 x 10-26 e cm at 90% CL as set by the Institut Laue-Langevin (ILL) [1] was largely limited by systematic effects related to the magnetic field. The research presented here supported technical progress toward a new measurement of the nEDM, with the goal of improving the result by an order of magnitude. A novel approach to the problem of limiting systematics is proposed, studied in Monte Carlo simulations, and an optimized prototype was constructed for use in a magnetic resonance experiment.
Subjects/Keywords: Neutrons; electric dipole moment; magnetic fields; Instrumentation; Nuclear; Physical Processes; Quantum Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dadisman, J. R. (2018). MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/physastron_etds/53
Chicago Manual of Style (16th Edition):
Dadisman, James Ryan. “MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS.” 2018. Doctoral Dissertation, University of Kentucky. Accessed April 10, 2021.
https://uknowledge.uky.edu/physastron_etds/53.
MLA Handbook (7th Edition):
Dadisman, James Ryan. “MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS.” 2018. Web. 10 Apr 2021.
Vancouver:
Dadisman JR. MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS. [Internet] [Doctoral dissertation]. University of Kentucky; 2018. [cited 2021 Apr 10].
Available from: https://uknowledge.uky.edu/physastron_etds/53.
Council of Science Editors:
Dadisman JR. MAGNETIC FIELD DESIGN TO REDUCE SYSTEMATIC EFFECTS IN NEUTRON ELECTRIC DIPOLE MOMENT MEASUREMENTS. [Doctoral Dissertation]. University of Kentucky; 2018. Available from: https://uknowledge.uky.edu/physastron_etds/53
University of Guelph
21.
Rand, Evan Thomas.
Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions.
Degree: PhD, Department of Physics, 2015, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9416
► A nuclear-structure campaign has been initiated to investigate the isotopes of Hg around mass 199. To date, 199Hg provides the most stringent limit on an…
(more)
▼ A nuclear-structure campaign has been initiated to investigate the isotopes of Hg around mass 199. To date, 199Hg provides the most stringent limit on an atomic
electric dipole moment (EDM). Standard Model predictions of the EDM in 199Hg are many orders of magnitude below current experimental reach. There are, however, many models beyond the Standard Model, such as multiple-Higgs theories and supersymmetry, that generally predict much larger EDMs within experimental reach. The observation of a large permanent EDM would represent a clear signal of CP violation from new physics outside the Standard Model. Theoretical nuclear-structure calculations for 199Hg are challenging, and give varied predictions for the excited-state spectrum. Understanding the E2 and E3 strengths in 199Hg will make it possible to develop a nuclear-structure model for the Schiff strength based on these matrix elements, and thereby constrain present models that predict the contribution of octupole collectivity to the Schiff
moment of the nucleus. One of the most direct ways of measuring the matrix elements connecting the ground state to excited states is through inelastic hadron scattering. The high level density of a heavy odd-A nucleus like 199Hg makes a measurement extremely challenging. Complementary information can, however, be determined for states in the neighbouring even-even isotopes of 198Hg and 200Hg, and single-nucleon transfer reactions on targets of even-even isotopes of Hg can yield important information on the single-particle nature of 199Hg. The work presented here is the result of two experiments which used a 22-MeV deuteron beam incident on an isotopically enriched target of 200Hg32S. These experiments were performed using the Q3D magnetic spectrograph at the Maier-Leibnitz Laboratory, in Garching, Germany. The first experiment was an inelastic deuteron scattering experiment, 200Hg(d,d’)200Hg, populating 97 states up to an excitation energy of 4.2 MeV. Fifty-four states were newly discovered. Deformation parameters were extracted through coupled-channel calculations with global optical-model potential (OMP) parameter sets. The total B(E3; 0+ to 3-) strength in this region was estimated to be 0.55+0.12-0.18 e2b3, where the reported errors represent the upper and lower limits. The second experiment was a single-nucleon transfer reaction into 199Hg, 200Hg(d,t)199Hg, up to an excitation energy of 3 MeV. In total, 91 excited levels were identified, including fifty newly observed levels in this work. Spin-parity assignments and spectroscopic factors were extracted through distorted-wave Born approximation calculations with global OMP sets. The results from these two experiments are presented and further discussed in this thesis.
Advisors/Committee Members: Garrett, Paul (advisor), Svensson, Carl (advisor).
Subjects/Keywords: direct nuclear reactions; deuteron inelastic scattering; (d,t) pickup reaction; 199Hg; 200Hg; electric dipole moment; Schiff moment; DWBA; Coupled-channel calculations
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rand, E. T. (2015). Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions. (Doctoral Dissertation). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9416
Chicago Manual of Style (16th Edition):
Rand, Evan Thomas. “Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions.” 2015. Doctoral Dissertation, University of Guelph. Accessed April 10, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9416.
MLA Handbook (7th Edition):
Rand, Evan Thomas. “Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions.” 2015. Web. 10 Apr 2021.
Vancouver:
Rand ET. Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions. [Internet] [Doctoral dissertation]. University of Guelph; 2015. [cited 2021 Apr 10].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9416.
Council of Science Editors:
Rand ET. Investigation of the E2 and E3 matrix elements in 200Hg using direct nuclear reactions. [Doctoral Dissertation]. University of Guelph; 2015. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9416
University of Colorado
22.
Gresh, Daniel.
The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions.
Degree: PhD, 2018, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/243
► A measurement of the permanent electric dipole moment of the electron (eEDM, d<sub><i>e</i></sub>) is a direct probe of physics beyond the Standard Model. Our…
(more)
▼ A measurement of the permanent
electric dipole moment of the electron (eEDM, d<sub><i>e</i></sub>) is a direct probe of physics beyond the Standard Model. Our experiment makes a measurement of the eEDM in Hafnium Fluoride ions (HfF<sup+</sup>) using a novel radiofrequency ion trap where we routinely achieve measurement coherence times of > 1 s. This thesis presents the result of our first generation eEDM measurement, where we measure <i>d
e</i> = (0.9±7.7
stat±1.7
syst) ✕ 10
-29<i>e</i>⋅cm, a value consistent with zero, which corresponds to a 90% confidence upper bound of <i>d
e</i> < 1.3 ✕ 10
-28 <i>e</i> ⋅ cm. This result was extracted from 313.8 hours of data. Our final eEDM measurement is limited by statistical sensitivity as opposed to systematic error. This thesis additionally presents the results of broadband frequency comb velocity modulation spectroscopy of a candidate molecular ion for a future generation eEDM experiment, the Thorium Fluoride ion (ThF
+). ThF
+ is a promising candidate due to its larger effective
electric field and its
3Δ
1 ground state; the ground state assignment was determined in this work. By extending a titanium-doped-sapphire frequency comb source to cover the 696 - 900 nm spectral region we measure a total of 3,260 cm
-1 (98 THz) of continuous spectra with 150 MHz resolution. We additionally acquire 400 cm
-1 of spectra in the 900 - 1000 nm region with targeted continuous-wave laser scans. We have measured and fit twenty-seven vibrational bands connecting fourteen distinct electronic states. We will discuss the assignment of the electronic ground state and the assignment of intermediate electronic states that can be used for state preparation and readout.
Advisors/Committee Members: Eric A. Cornell, Jun Ye, John L. Bohn, J Mathias. Weber, Heather J. Lewandowski.
Subjects/Keywords: electron electric dipole moment; frequency comb; molecular ions; precision measurement; spectroscopy; Atomic, Molecular and Optical Physics; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gresh, D. (2018). The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/243
Chicago Manual of Style (16th Edition):
Gresh, Daniel. “The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions.” 2018. Doctoral Dissertation, University of Colorado. Accessed April 10, 2021.
https://scholar.colorado.edu/phys_gradetds/243.
MLA Handbook (7th Edition):
Gresh, Daniel. “The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions.” 2018. Web. 10 Apr 2021.
Vancouver:
Gresh D. The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions. [Internet] [Doctoral dissertation]. University of Colorado; 2018. [cited 2021 Apr 10].
Available from: https://scholar.colorado.edu/phys_gradetds/243.
Council of Science Editors:
Gresh D. The First Precision Measurement of the Electron Electric Dipole Moment in Trapped Molecular Ions. [Doctoral Dissertation]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/phys_gradetds/243
23.
Gharibnejad, Heman.
Computational Atomic Structure and Search for New Physics.
Degree: 2014, University of Nevada – Reno
URL: http://hdl.handle.net/11714/2964
► The overarching goal of this dissertation is to examine constraints on extensions tothe Standard Model (SM) through atomic-structure computations. More specifically,atomic parity-nonconserving (PNC) amplitudes and…
(more)
▼ The overarching goal of this dissertation is to examine constraints on extensions tothe Standard Model (SM) through atomic-structure computations. More specifically,atomic parity-nonconserving (PNC) amplitudes and intrinsic
electric dipole moments(EDM) are examined for sources of physics beyond the SM. Precision calculationsof these properties in the trivalent thallium atom, will help set new constraints onsearches beyond the SM.To this end, the first half of the dissertation is devoted to improving atomic structurecalculations. In particular, we numerically investigate the effectivenessof two convergence methods for coupled-cluster (CC) method. Further we explorethe feasibility of transferring high-precision CC methods, developed for monovalentatoms, to trivalent systems. Here we showcase calculations of various properties of thetrivalent atomic boron as a prototype for future precision computations for thallium.In the second half of the dissertation, we consider \dark force" extensions tothe the SM. We introduce \dark forces" by considering the parity-odd as well assimultaneous parity-and time-reversal-violating interactions between atomic electronsand nucleons. Here we hypothesize the exchange of a \dark sector" light gauge-bosonparticle between atomic electrons and nucleons, as the source of the \dark force".Furthermore, using the latest experimental upper limits on mercury EDM and errorbars on the cesium PNC experiments, we place constraints on the coupling strengthsof such \dark forces" with ordinary matter.
Advisors/Committee Members: Derevianko, Andrei (advisor), Safronova, Alla (committee member), Weinstein, Jonathan (committee member), Geraci, Andrew (committee member), Varganov, Sergey (committee member).
Subjects/Keywords: Atomic/Molecular Optical; Atomic Parity Violation; Coupled Cluster; Dark Force; Exchange of light Gauge-Bosons; Permenant Electric Dipole Moment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gharibnejad, H. (2014). Computational Atomic Structure and Search for New Physics. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/2964
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gharibnejad, Heman. “Computational Atomic Structure and Search for New Physics.” 2014. Thesis, University of Nevada – Reno. Accessed April 10, 2021.
http://hdl.handle.net/11714/2964.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gharibnejad, Heman. “Computational Atomic Structure and Search for New Physics.” 2014. Web. 10 Apr 2021.
Vancouver:
Gharibnejad H. Computational Atomic Structure and Search for New Physics. [Internet] [Thesis]. University of Nevada – Reno; 2014. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/11714/2964.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gharibnejad H. Computational Atomic Structure and Search for New Physics. [Thesis]. University of Nevada – Reno; 2014. Available from: http://hdl.handle.net/11714/2964
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Chu, Ping-Han.
Neutron electric dipole moment and dressed spin.
Degree: PhD, 0240, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/29817
► The neutron electric dipole moment (EDM) experiment has played a unique role in examining the violation of fundamental symmetries and understanding the nature of electroweak…
(more)
▼ The neutron
electric dipole moment (EDM) experiment has played a unique role in examining the violation of fundamental symmetries and understanding the nature of electroweak and strong interaction. A non-zero neutron EDM is one of direct evidence for CP and T violation and has the potential to reveal the origin of CP violation and to explore physics beyond the Standard Model.
A new neutron EDM experiment will be built to improve a factor of 100 by using a novel technique
of ultra-cold neutrons(UCN) in superfluid 4He at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL). In the experiment, 3He in the measurement cell will be used as a neutron spin analyzer and a comagnetometer. The absorption between UCN and 3He atoms will emit scintillation light in the superfluid 4He depending on the angle between nuclear spins of two particles. Consequently, the neutron precession frequency can be derived by the scintillation light amplitude. Furthermore, the 3He precession frequency can be measured by the superconducting quantum interference device (SQUID).
A dressed-spin technique will also be applied to measure the small precession frequency change due to
a non-zero neutron EDM. The dressed-spin technique is used to modify the effective precession frequencies of neutrons and 3He atoms to make them equal by applying an oscillatory field (dressing field) that is perpendicular to the static magnetic field. The phenomenon of the dressed spin for 3He in a cell should be demonstrated before the proposed neutron EDM experiment. A successful measurement over a broad range of the amplitude and frequency of the dressing field was done at the University of Illinois. The observed effects can be explained by using quantum optics formalism. The formalism is diagonalized to solve the solution and confirms the data.
In addition, the application of the dressed-spin technique was investigated. The modulation and the feedback loop technique should be considered with the dressed-spin technique for the measurement of the small EDM effect. The modulation of the dressing field arbitrarily changes the relative precession frequency between UCN and 3He. Through the feedback loop, the effective neutron precession frequency can be measured.
The corresponding sensitivity of neutron EDM will be estimated. A future neutron EDM experiment
could be improved if the dressed-spin technique can be carefully considered and applied.
Advisors/Committee Members: Peng, Jen-Chieh (advisor), Baym, Gordon A. (committee member), Peng, Jen-Chieh (committee member), Giannetta, Russell W. (committee member).
Subjects/Keywords: neutron; electric dipole moment (EDM); dressed spin
…permanent electric dipole moment (EDM) becomes attractive since a non-zero EDM implies
T… …of electric dipole moment
If an elementary particle has a nonzero EDM, the EDM must be… …dipole moment (EDM) experiments detect EDM via the tiny Stark splitting [85]… …Zeeman effect, an energy splitting due to the magnetic dipole moment
and the magnetic field in… …to reduce the
systematic uncertainties such as the coupling of the magnetic dipole moment…
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chu, P. (2012). Neutron electric dipole moment and dressed spin. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29817
Chicago Manual of Style (16th Edition):
Chu, Ping-Han. “Neutron electric dipole moment and dressed spin.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 10, 2021.
http://hdl.handle.net/2142/29817.
MLA Handbook (7th Edition):
Chu, Ping-Han. “Neutron electric dipole moment and dressed spin.” 2012. Web. 10 Apr 2021.
Vancouver:
Chu P. Neutron electric dipole moment and dressed spin. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2142/29817.
Council of Science Editors:
Chu P. Neutron electric dipole moment and dressed spin. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29817
25.
Rogers, Patrick.
Optimization of the NEDM Experiment.
Degree: MS, Physics, 2017, University of Tennessee – Knoxville
URL: https://trace.tennessee.edu/utk_gradthes/4776
► The Neutron Electric Dipole Moment (NEDM) experiment is an upcoming experiment at ORNL to measure the size of an electric dipole moment inside of…
(more)
▼ The Neutron
Electric Dipole Moment (NEDM) experiment is an upcoming experiment at ORNL to measure the size of an
electric dipole moment inside of the neutron. This is being done to probe CP asymmetries that could give rise to a matter dominated universe. The experiment will utilize a nuclear reaction that outputs scintillation light in a manner that depends on the alignment of the spins of the reactant particles. This light will be detected and used to measure the NEDM. The amount of light collected for measurement will impact the accuracy of the results; the more photons collected the better the accuracy. However, during the process of transporting light from the reaction site to the light detectors, much of the scintillation light will be lost. Herein are the results of tests conducted on various parts of the NEDM apparatus in order to characterize and optimize light collection for the coming experiment.
Advisors/Committee Members: Geoffrey Greene, Nadia Fomin, Soren Sorensen, Yuri Efrimenko.
Subjects/Keywords: nedm; neutron electric dipole moment; Other Physics
…42
vi
CHAPTER ONE
THEORY AND MOTIVATION
Introduction
The Neutron Electric Dipole Moment… …to measure the size of an electric dipole
moment within the neutron. The Standard Model… …electric
dipole moment of a larger size than the Standard Model prediction using a small amount… …small, but measureable neutron
electric dipole moment [1]. If the nEDM were measured… …electric dipole moment and the matter/antimatter asymmetry of the universe is due to the fact…
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rogers, P. (2017). Optimization of the NEDM Experiment. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/4776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rogers, Patrick. “Optimization of the NEDM Experiment.” 2017. Thesis, University of Tennessee – Knoxville. Accessed April 10, 2021.
https://trace.tennessee.edu/utk_gradthes/4776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rogers, Patrick. “Optimization of the NEDM Experiment.” 2017. Web. 10 Apr 2021.
Vancouver:
Rogers P. Optimization of the NEDM Experiment. [Internet] [Thesis]. University of Tennessee – Knoxville; 2017. [cited 2021 Apr 10].
Available from: https://trace.tennessee.edu/utk_gradthes/4776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rogers P. Optimization of the NEDM Experiment. [Thesis]. University of Tennessee – Knoxville; 2017. Available from: https://trace.tennessee.edu/utk_gradthes/4776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Maryland
26.
An, Haipeng.
Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter.
Degree: Physics, 2011, University of Maryland
URL: http://hdl.handle.net/1903/11700
► In a class of other beyond-standard-model theories, CP-odd observables, such as the neutron electric dipole moment, receive significant contributions from flavorneutral P-odd and CP-odd four-quark…
(more)
▼ In a class of other beyond-standard-model theories, CP-odd observables, such as the neutron
electric dipole moment, receive significant contributions from flavorneutral P-odd and CP-odd four-quark operators. However, considerable uncertainties exist in the hadronic matrix elements of these operators strongly affecting the
experimental constraints on CP-violating parameters in the theories. Here we study their hadronic matrix elements in combined chiral perturbation theory and nucleon models. We first classify the operators in chiral representations and present the leading-order QCD evolutions. We then match the four-quark operators to the corresponding ones in chiral hadronic theory, finding symmetry relations among the matrix elements. Although this makes lattice QCD calculations feasible, we choose to estimate the non-perturbative matching coefficients in simple quark models. We
finally compare the results for the neutron
electric dipole moment and P-odd and CP-odd pion-nucleon couplings with the previous studies using naive factorization and QCD sum rules. Our study shall provide valuable insights on the present hadronic physics uncertainties in these observables.
Using an effective theory approach, the neutron
electric dipole moment in the minimal left-right symmetric model with both explicit and spontaneous CP violations is recalculated systematically. Using the state-of-the-art hadronic matrix elements, nEDM as a function of right-handed W-boson mass and CP-violating parameters is obtained. The most stringent constraint yet on the left-right symmetric scale in the minimal version of left-right symmetric model is obtained to be M
WR > (10 ± 3) TeV.
Light WIMP (weakly interacting massive particle)-like signals were reported by dark matter direct detection experiments. WIMP candidates in this energy range can be constrained by various collider experiments. We show that colliders can impose strong constraints on models of low mass dark matter, in particular in the case that the direct detection interaction depends on the momentum of dark matter. We also find in the case of low mass dark matter, there are tensions between the observed relic abundance and collider constraints. Putting the constraints from collider physics, relic abundance and direct detection experiments, a large part of parameter space in different models can be ruled out.
Advisors/Committee Members: Ji, Xiangdong (advisor).
Subjects/Keywords: Physics; Collider Physics; CP violation; Dark Matter; Neutron Electric Dipole Moment; Parity violation; Spontaneous Symmetry Breaking
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
An, H. (2011). Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/11700
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
An, Haipeng. “Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter.” 2011. Thesis, University of Maryland. Accessed April 10, 2021.
http://hdl.handle.net/1903/11700.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
An, Haipeng. “Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter.” 2011. Web. 10 Apr 2021.
Vancouver:
An H. Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter. [Internet] [Thesis]. University of Maryland; 2011. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1903/11700.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
An H. Minimal Left-Right Symmetric Model, Neutron Electric Dipole Moment and Dark Matter. [Thesis]. University of Maryland; 2011. Available from: http://hdl.handle.net/1903/11700
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Kentucky
27.
Nouri, Nima.
MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS.
Degree: 2016, University of Kentucky
URL: https://uknowledge.uky.edu/physastron_etds/38
► A new neutron Electric Dipole Moment (nEDM) experiment was proposed to be commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source (SNS)…
(more)
▼ A new neutron Electric Dipole Moment (nEDM) experiment was proposed to be commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source (SNS) of the Oak Ridge National Laboratory (ORNL). The underlying theme of this experiment (first conceived by Golub and Lamoreaux in 1994) is the search for new physics beyond the Standard Model of particle physics. The discovery of a non-zero nEDM would be of revolutionary importance to physics, with the discovery of such providing for evidence for new-beyond-the-Standard-Model physics required for a resolution to the unresolved puzzle of why the universe is dominated by matter, as opposed to anti-matter. A first demonstration of a new magnetic field monitoring system for a neutron electric dipole moment experiment is presented. The system is designed to reconstruct the vector components of the magnetic field in the interior measurement region solely from exterior measurements. The results highlight the potential for the implementation of an improved system in an upcoming neutron electric dipole moment experiment to be carried out at the Spallation Neutron Source at Oak Ridge National Laboratory.
Subjects/Keywords: Nuclear Physics; Standard Model; Neutron electric dipole moment; Interior magnetic field vector components; Interior magnetic field gradients; g-2; Nuclear
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nouri, N. (2016). MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/physastron_etds/38
Chicago Manual of Style (16th Edition):
Nouri, Nima. “MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS.” 2016. Doctoral Dissertation, University of Kentucky. Accessed April 10, 2021.
https://uknowledge.uky.edu/physastron_etds/38.
MLA Handbook (7th Edition):
Nouri, Nima. “MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS.” 2016. Web. 10 Apr 2021.
Vancouver:
Nouri N. MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS. [Internet] [Doctoral dissertation]. University of Kentucky; 2016. [cited 2021 Apr 10].
Available from: https://uknowledge.uky.edu/physastron_etds/38.
Council of Science Editors:
Nouri N. MAGNETIC FIELD NON-UNIFORMITY CHALLENGES IN NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENTS. [Doctoral Dissertation]. University of Kentucky; 2016. Available from: https://uknowledge.uky.edu/physastron_etds/38
Virginia Tech
28.
Rayyan, Saifuddin Ramadan.
Phenomenological Consequences of Heavy Right Handed Neutrinos.
Degree: PhD, Physics, 2007, Virginia Tech
URL: http://hdl.handle.net/10919/27879
► The discovery of neutrino mixing provides the possibility of a non vanishing CP violating phase in the neutrino mixing matrix. CP violation in the leptonic…
(more)
▼ The discovery of neutrino mixing provides the possibility of a non vanishing CP violating phase in the neutrino mixing matrix. CP violation in the leptonic sector can be large enough to explain the matter-antimatter asymmetry in the universe. An indirect probe of CP violation is the experimental measurement of
Electric Dipole Moment (EDM). CP violation has been discovered in the quark sector,but it contributes to lepton EDM at the 3-loop level.
Neutrino masses can be generated in the standard model via the see-saw mechanism where heavy right-handed neutrinos mix with the weak-basis states. The Majorana nature of the seesaw type neutrinos generates new 2-loop diagrams that lead to a non-vanishing lepton EDM. Only estimates of the resulting EDM have been done in the literature. A full calculation of the 2-loop diagrams and the exact result is presented.
Advisors/Committee Members: Takeuchi, Tatsu (committeechair), Minic, Djordje (committee member), Chang, Lay Nam (committee member), Schmittmann, Beate (committee member), Mizutani, Tetsuro (committee member), Pitt, Mark L. (committee member).
Subjects/Keywords: Right Handed Neutrinos; CP violation; Electric Dipole Moment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rayyan, S. R. (2007). Phenomenological Consequences of Heavy Right Handed Neutrinos. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/27879
Chicago Manual of Style (16th Edition):
Rayyan, Saifuddin Ramadan. “Phenomenological Consequences of Heavy Right Handed Neutrinos.” 2007. Doctoral Dissertation, Virginia Tech. Accessed April 10, 2021.
http://hdl.handle.net/10919/27879.
MLA Handbook (7th Edition):
Rayyan, Saifuddin Ramadan. “Phenomenological Consequences of Heavy Right Handed Neutrinos.” 2007. Web. 10 Apr 2021.
Vancouver:
Rayyan SR. Phenomenological Consequences of Heavy Right Handed Neutrinos. [Internet] [Doctoral dissertation]. Virginia Tech; 2007. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10919/27879.
Council of Science Editors:
Rayyan SR. Phenomenological Consequences of Heavy Right Handed Neutrinos. [Doctoral Dissertation]. Virginia Tech; 2007. Available from: http://hdl.handle.net/10919/27879
29.
Kermaidic, Yoann.
Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg.
Degree: Docteur es, Physique subatomique et astroparticules, 2016, Université Grenoble Alpes (ComUE)
URL: http://www.theses.fr/2016GREAY055
► Un moment dipolaire électrique permanent (EDM) est une propriété fondamentale des systèmes simples comme par exemple l'électron, les atomes/molécules ou le neutron dont l'existence est…
(more)
▼ Un moment dipolaire électrique permanent (EDM) est une propriété fondamentale des systèmes simples comme par exemple l'électron, les atomes/molécules ou le neutron dont l'existence est prédite par le Modèle Standard de la physique des particules (MS) mais qui n'a pas pour l'heure jamais été observée. Cette observable violant la symétrie CP offre la possibilité de relier la physique des particules à l'énigme cosmologique fondamentale de l'asymétrie baryonique de l'Univers observée de nos jours. Produire une telle asymétrie requiert de nouvelles sources/de nouveaux mécanismes de violation de CP, hors MS, qui peuvent être sondés de façon privilégiée par les recherches d'EDM. La sensibilité des expériences EDM actuelles se trouve des ordres de grandeurs au-dessus des prédictions du secteur faible du MS. L'absence de signal, après 60 ans de quête, détermine la limite supérieure la plus forte sur la violation de CP dans le secteur fort du MS et contraint l'espace des phases des modèles de nouvelle physique. A contrario, la mesure d'un EDM non nul dans les années à venir pourra s'interpréter comme le signal d'une physique au-delà du MS évoluant à l'échelle multi-TeV. Dans cette perspective envoûtante, de nombreux nouveaux projets de mesures des EDM ont vu le jour ces dernières années et d'importants efforts sont poursuivis auprès du neutron notamment. Ce manuscrit présente la recherche de l'EDM du neutron menée auprès de l'expérience la plus sensible à ce jour basée à l'Institut Paul Scherrer en Suisse.
A permanent electric dipole moment (EDM) is a fundamental property of simple systems such as the electron, atoms/molecules or the neutron whose amplitude is expected to be non-zero within the Standard Model of particles physics (SM) but which has never been observed so far. This observable violating the CP symmetry offers the opportunity to link particle physics to the fundamental cosmological enigma of the observed baryon asymmetry of the Universe. Such an asymmetry requires new CP violation sources/mechanism beyond the SM, which can be best probed by EDM searches. The current EDM experiments sensitivity is order of magnitude above the weak SM sector predictions. Measuring a null EDM, after a 60 years quest, set the strongest upper limit on the CP violation in the strong SM sector and constrains the new physics models phase space. On the contrary, measuring a non-zero EDM in the coming years can be understood as a signal from physics beyond the SM evolving at a multi-TeV scale. In this haunting perspective, many new EDM projects raised in the last years and important efforts are pursued near the neutron in particular. This manuscript present the neutron EDM search near the most sensitive experiment running at the Paul Scherrer Institute in Switzerland.
Advisors/Committee Members: Rebreyend, Dominique (thesis director), Pignol, Guillaume (thesis director).
Subjects/Keywords: Moment dipolaire électrique du neutron; Violation de CP; Magnétométrie atomique; Baryogenèse électrofaible; Mercure; Neutron electric dipole moment; CP violation; Atomic magnetometry; Electroweak baryogenesis; Mercury; 530
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kermaidic, Y. (2016). Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2016GREAY055
Chicago Manual of Style (16th Edition):
Kermaidic, Yoann. “Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg.” 2016. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed April 10, 2021.
http://www.theses.fr/2016GREAY055.
MLA Handbook (7th Edition):
Kermaidic, Yoann. “Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg.” 2016. Web. 10 Apr 2021.
Vancouver:
Kermaidic Y. Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2016. [cited 2021 Apr 10].
Available from: http://www.theses.fr/2016GREAY055.
Council of Science Editors:
Kermaidic Y. Mesure du moment dipolaire électrique du neutron : analyse de données et développement autour du ¹⁹⁹Hg : Neutron electric dipole moment search : data analysis and development around the ¹⁹⁹Hg. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2016. Available from: http://www.theses.fr/2016GREAY055
Indian Institute of Science
30.
Ravi, Harish.
Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron.
Degree: PhD, Faculty of Science, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3817
► We give a brief introduction to atomic physics and the motivation behind our experiments in the first chapter. The electron’s electric dipole moment is an…
(more)
▼ We give a brief introduction to atomic physics and the motivation behind our experiments in the first chapter. The electron’s
electric dipole moment is an interesting quantity which is yet to be measured. In the 3rd Chapter, we use the technique of chopped non-linear magneto-optic rotation (NMOR) in a room temperature Cs vapor cell to measure the permanent
electric dipole moment (EDM) in the atom. The cell has paraffin coating on the walls to increase the relaxation time. The signature of the EDM is a shift in the Larmor precession frequency correlated with the application of an E field. We analyze errors in the technique, and show that the main source of systematic error is the appearance of a longitudinal magnetic field when an
electric field is applied. This error can be eliminated by doing measurements on the two ground hyperfine levels. Using an E field of 2.6 kV/cm, we place an upper limit on the electron EDM of 2.9 × 10−22 e-cm with 95% confidence. This limit can be increased by 7 orders-of-magnitude—and brought below the current best experimental value. We give future directions for how this may be achieved. In chapter 4, we examine the Hanle effect for linear and circularly polarized light for different ground states and we find opposite behavior in the transmission signal. In one case, it shifts from enhanced transmission to enhanced absorption and vice-versa in the other case. In Chapter 5, we study the transmission spectrum at different temperatures and device a way to find the number density. We then verify the Clausius-Clapeyron equation and also find the latent heat of vaporization of Cs. Finally, we wrap up with conclusions and future directions.
Advisors/Committee Members: Natarajan, Vasanth (advisor).
Subjects/Keywords: Electric Dipole Moment; Chopped Nonlinear Magnetic-Optic Rotation; Electric Dipole Moment (EDM); Hanle Measurement; EDM Measurement; Number Density; Density-Matrix Code; Nonlinear Magneto-optic Rotation (NMOR); Faraday Effect; Clausius-Clapeyron Equation; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ravi, H. (2018). Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3817
Chicago Manual of Style (16th Edition):
Ravi, Harish. “Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed April 10, 2021.
http://etd.iisc.ac.in/handle/2005/3817.
MLA Handbook (7th Edition):
Ravi, Harish. “Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron.” 2018. Web. 10 Apr 2021.
Vancouver:
Ravi H. Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Apr 10].
Available from: http://etd.iisc.ac.in/handle/2005/3817.
Council of Science Editors:
Ravi H. Experiments on the 852 nm D2 Line of 133Cs with a Diode Laser System and their use in Measurement of the Permanent Electric Dipole Moment of the Electron. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3817
◁ [1] [2] ▶
. 
Open Access Theses and Dissertations
