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University of Guelph
1.
Jigmeddorj, Badamsambuu.
Nuclear Structure Study of Cd-110 through Internal Conversion Electrons.
Degree: MS, Department of Physics, 2012, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3873 
► For many years, Cd-110 has been considered the classic example of a vibrational nucleus within both the Collective Model and the Interacting Boson Model (IBM).…
(more)
▼ For many years, Cd-110 has been considered the classic example of a vibrational nucleus within both the Collective Model and the Interacting Boson Model (IBM). As a vibrational nucleus, Cd-110 exhibits multi-phonon states. Recent studies on other cadmium isotopes have shown a breakdown of vibrational motion at the three-phonon level. The latest study on Cd-112 suggests that some of these excitations may instead result from intruder bands. The study through internal conversion electrons is important to investigate intruder structures in Cd-110, using the enhanced E0 transitions between intruder states and spherical phonon states as a signature. The nuclear structure of Cd-110 has been studied with In-110 beta decay through internal conversion electrons performed at TRIUMF using the 8pi spectrometer. The level scheme of Cd-110 through internal conversion electron transitions was constructed using the electron-gamma coincidence matrix. The sub-shell ratios and multipolarities are determined and compared with the evaluated data set. The absolute internal conversion coefficients for some mixed transitions were determined using an internal calibration efficiency for Si(Li) detector and relative efficiency for HPGe detector. The 396 keV and 708 keV E0 transitions have been observed between intruder and spherical phonon states. The E0 transition strength of 0.115(71) was determined for 708.21 keV line.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: Collective model; Cd-110; phonon states; E0-transition; Conversion electron; Conversion coefficient
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APA (6th Edition):
Jigmeddorj, B. (2012). Nuclear Structure Study of Cd-110 through Internal Conversion Electrons. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3873
Chicago Manual of Style (16th Edition):
Jigmeddorj, Badamsambuu. “Nuclear Structure Study of Cd-110 through Internal Conversion Electrons.” 2012. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3873.
MLA Handbook (7th Edition):
Jigmeddorj, Badamsambuu. “Nuclear Structure Study of Cd-110 through Internal Conversion Electrons.” 2012. Web. 03 Mar 2021.
Vancouver:
Jigmeddorj B. Nuclear Structure Study of Cd-110 through Internal Conversion Electrons. [Internet] [Masters thesis]. University of Guelph; 2012. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3873.
Council of Science Editors:
Jigmeddorj B. Nuclear Structure Study of Cd-110 through Internal Conversion Electrons. [Masters Thesis]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3873
University of Guelph
2.
Chagnon-Lessard, Sophie.
Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature.
Degree: MS, Department of Physics, 2012, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3842
► Nuclei near N=90 and Z=64 have recently been suggested to be `tetrahedral-magic'. One of the main signatures for tetrahedral symmetry is a vanishing quadrupole moment…
(more)
▼ Nuclei near N=90 and Z=64 have recently been suggested to be `tetrahedral-magic'. One of the main signatures for tetrahedral symmetry is a vanishing quadrupole moment in low-lying negative-parity bands, resulting in very weak or even vanishing E2 matrix elements. With N=90 and Z=62, the transitional nucleus 152Sm is a potential candidate for relatively stable tetrahedral symmetry. Its structure was investigated using deuteron inelastic scattering with a 22 MeV polarized beam at the MP tandem Van de Graaff accelerator of the TU/LMU Munich. The scattered deuterons were momentum analyzed using the Q3D spectrometer. The experimental spectra obtained have allowed the extraction of high-quality differential cross-sections and analyzing powers for levels up to 1.8 MeV. The low-lying negative-parity bands are observed to be strongly populated and the angular distributions associated to their levels exhibit several structural features. The overall agreement is relatively good when considering strong intra-band E2 transitions, but further calculations must be performed to allow precise matrix element extraction. In particular, a simple population pathway test on the 1- state has demonstrated that calculations with vanishing E2 transitions in the negative-parity band are also capable of reproducing its experimental angular distributions. Therefore, the presence of tetrahedral symmetry signature in 152Sm is not excluded.
Advisors/Committee Members: Garrett, Paul E. (advisor).
Subjects/Keywords: nuclear structure; 152Sm; tetrahedral symmetry; inelastic scattering
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APA (6th Edition):
Chagnon-Lessard, S. (2012). Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3842
Chicago Manual of Style (16th Edition):
Chagnon-Lessard, Sophie. “Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature.” 2012. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3842.
MLA Handbook (7th Edition):
Chagnon-Lessard, Sophie. “Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature.” 2012. Web. 03 Mar 2021.
Vancouver:
Chagnon-Lessard S. Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature. [Internet] [Masters thesis]. University of Guelph; 2012. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3842.
Council of Science Editors:
Chagnon-Lessard S. Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature. [Masters Thesis]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3842
University of Guelph
3.
Diaz Varela, Alejandra.
Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In.
Degree: MS, Department of Physics, 2013, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7416
► A study of the 110In beta+/EC decay was performed at the TRIUMF Isotope Separator and Accelerator (ISAC) facility to probe the nuclear structure of 110Cd.…
(more)
▼ A study of the 110In beta+/EC decay was performed at the TRIUMF
Isotope Separator and Accelerator (ISAC) facility to probe the nuclear
structure of 110Cd. The data were collected in scaled-down gamma-ray singles,
gamma-gamma coincidence, and γ-electron coincidence modes. The level scheme
of 110Cd was expanded significantly by identifying 75 levels under 3.8 MeV, including
12 new ones, and the number of previously observed transitions from
these levels was nearly doubled to 273. The gamma-ray branching intensities were extracted
through an analysis of the coincidence intensities. The branching
ratios were combined with a reanalysis of lifetimes measurements obtained in an (n,n'gamma) reaction with
monoenergetic neutrons for the calculation of B(E2) values and these results have lead to
the proposal of a gamma-soft rotor, or O(6) nucleus, rather than a
vibrational, or U(5) pattern for the nature of the low-lying, low-spin levels
in 110Cd.
Advisors/Committee Members: Garrett, Paul E (advisor).
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APA (6th Edition):
Diaz Varela, A. (2013). Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7416
Chicago Manual of Style (16th Edition):
Diaz Varela, Alejandra. “Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In.” 2013. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7416.
MLA Handbook (7th Edition):
Diaz Varela, Alejandra. “Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In.” 2013. Web. 03 Mar 2021.
Vancouver:
Diaz Varela A. Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In. [Internet] [Masters thesis]. University of Guelph; 2013. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7416.
Council of Science Editors:
Diaz Varela A. Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In. [Masters Thesis]. University of Guelph; 2013. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7416
University of Guelph
4.
Burbadge, Christina.
Investigation of excited 0+ states populated in the 162Er(p,t) reaction.
Degree: MS, Department of Physics, 2017, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10467
► Interpreting the nature of excited states in well-deformed nuclei has been an ongoing challenge in our understanding of nuclear structure. Some of the approaches that…
(more)
▼ Interpreting the nature of excited states in well-deformed nuclei has been an ongoing challenge in our understanding of nuclear structure. Some of the approaches that have been implemented to interpret the occurrence of low-lying excited 02+ states include vibrational excitations in β-phonons and γ-phonons, as well as pairing excitations. A further complication is the presence of shape coexistence which can increase the number of low-lying states, and if the shapes undergo mixing, the spectroscopic signatures can become ambiguous. An example of such a case is in the rare-earth region, where there is a rapid change in the ground state shape from N = 88 to N = 92. One of the difficulties in resolving the nature of these states is that there is a paucity of data, particularly for excited 0+ states, in the rare earth region. Two-neutron transfer reactions are ideal for probing 0+ → 0+ transitions in deformed nuclei. One of the intriguing features of the rare-earth region are the strongly-populated 0+ states that emerge in both (p, t) and (t, p) two-neutron transfer reactions that have been interpreted as signatures of shape coexistence and pairing isomerism. In the present work, excited 0+ states have been studied via the 162Er(p, t)160Er reaction at the Maier-Leibnitz Laboratory in Garching, Germany using 22 MeV and 24 MeV proton beams and the reaction products were momentum-analyzed with the Q3D magnetic spectrograph. In this work, sixty-nine levels were observed and angular momenta were assigned for thirty-eight of these states. In total, seven excited 0+ states were assigned, six of which were unknown until the present work and one of which was not definite. The cross sections of these low-lying excited 0+ states, with the 02+ state population around 18% of the ground state strength, suggests a special character for this state which is inconsistent with a β-vibration interpretation. The similarity of the population of the 02+ state in 160Er with low-lying 0+ states in N = 90 isotones suggests that the nature of these excitations are quite similar, with the possibility that the 02+ state is an example of shape coexistence. Results of the relative population of the excited 0+ states in 160Er will be presented, and placed into context with similar experiments in the N = 90 region.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: Shape coexistence; Transfer Reactions
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APA (6th Edition):
Burbadge, C. (2017). Investigation of excited 0+ states populated in the 162Er(p,t) reaction. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10467
Chicago Manual of Style (16th Edition):
Burbadge, Christina. “Investigation of excited 0+ states populated in the 162Er(p,t) reaction.” 2017. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10467.
MLA Handbook (7th Edition):
Burbadge, Christina. “Investigation of excited 0+ states populated in the 162Er(p,t) reaction.” 2017. Web. 03 Mar 2021.
Vancouver:
Burbadge C. Investigation of excited 0+ states populated in the 162Er(p,t) reaction. [Internet] [Masters thesis]. University of Guelph; 2017. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10467.
Council of Science Editors:
Burbadge C. Investigation of excited 0+ states populated in the 162Er(p,t) reaction. [Masters Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/10467
University of Guelph
5.
Jigmeddorj, Badamsambuu.
Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\).
Degree: PhD, Department of Physics, 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/15852
► The Xe isotopes are located at a possible phase change in the collective structure from vibrational to rotational. The Xe isotopes therefore were considered as…
(more)
▼ The Xe isotopes are located at a possible phase change in the collective structure from vibrational to rotational. The Xe isotopes therefore were considered as potential candidates for (γ)-soft nuclei or (O(6)) symmetry limit within the IBM. However, testing of the O(6) symmetry in Xe reveals that indeed their structure is more complicated.
The study of the nucleus (
122Xe) is a part of a systematic examination of the development of collectivity in the Xe isotopes, which are located in the (Z>50), (N<82) region that display an extraordinarily smooth evolution of simple collective signatures. In order to probe the development of collectivity in greater detail, additional information on excited states is required. Specifically, the knowledge of excited states that decay to other excited states resulting low-energy transitions which can give strong indicators of the underlying structure need to be improved .
The experiment to study (
122Xe) with the (β
+/EC) decay of (
122Cs) was performed at the TRIUMF-ISAC facility located in Vancouver, B.C., Canada. Radioactive (
122Cs) beams from the ISAC facility were delivered to the 8(π) spectrometer which was composed of 20 HPGe detectors. The isomeric and ground states of (
122Cs) decay to the (
122Xe) with half lives of 21 seconds and a 3.7 minutes, respectively. Two sets of high-statistics data for short- and long-half-life decays were collected to have an access for potential excited states of the (
122Xe).
As an evidence of data quality, the level scheme of (
122Xe) has been dramatically extended by 177 new levels and 482 new transitions. Using (γ)-(γ) angular correlation analysis, 71 spin assignments have been made for 55 levels since a spin of some levels could be assigned via several different cascades. Mixing ratios for 44 (γ)-ray transitions were extracted from the angular correlation analysis by extracting the values from the minimized (χ
2) fit. Branching ratios have been determined for all observed transitions independently in the two different data sets collected with the short and long cycled runs. The data have been compared with a sd-IBM-1 calculation.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: Xe-122; beta decay; nuclear structure; Angular Correlation Analysis; level scheme; branching ratios; IBM1; Relative B(E2); Spin assignment
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APA (6th Edition):
Jigmeddorj, B. (2019). Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\). (Doctoral Dissertation). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/15852
Chicago Manual of Style (16th Edition):
Jigmeddorj, Badamsambuu. “Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\).” 2019. Doctoral Dissertation, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/15852.
MLA Handbook (7th Edition):
Jigmeddorj, Badamsambuu. “Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\).” 2019. Web. 03 Mar 2021.
Vancouver:
Jigmeddorj B. Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\). [Internet] [Doctoral dissertation]. University of Guelph; 2019. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/15852.
Council of Science Editors:
Jigmeddorj B. Nuclear Structure of \(^{122}Xe\) Studied via High-Statistics \(\beta^+/EC\) Decay of \(^{122}Cs\). [Doctoral Dissertation]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/15852
University of Guelph
6.
McGee, Erin.
Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture.
Degree: MS, Department of Physics, 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17409
► Shape coexistence has been established in several nuclei in the ({Z}) = 50 region of the chart of nuclides, but tellurium has thus far not…
(more)
▼ Shape coexistence has been established in several nuclei in the ({Z}) = 50 region of the chart of nuclides, but tellurium has thus far not been definitively characterized. In an attempt to characterize the structure of (
124Te), a measurement of the (
123Te)(n,γ) reaction was made using FIPPS, the Fission Prompt Product γ-ray Spectrometer, at the Institut Laue-Langevin in
Grenoble, France. A very high statistics data set was obtained, with on the order of (10
8) counts in the (2
1+) → (0
0+) transition. γ − γ coincidence data were analyzed. Particular interest was given to the 1647 keV excited (0
+) state, as a potential intruder state. ({B(E2)}) values were calculated for transitions from an elevated (2
+) state that directly feeds this suspected (0
+) intruder state.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: nuclear physics; shape coexistence; tellurium; 124Te; gamma-ray spectroscopy; neutron capture
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APA (6th Edition):
McGee, E. (2019). Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17409
Chicago Manual of Style (16th Edition):
McGee, Erin. “Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture.” 2019. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17409.
MLA Handbook (7th Edition):
McGee, Erin. “Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture.” 2019. Web. 03 Mar 2021.
Vancouver:
McGee E. Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture. [Internet] [Masters thesis]. University of Guelph; 2019. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17409.
Council of Science Editors:
McGee E. Searching for Shape Coexistence in \(^{123}Te\)(n,γ) Thermal Neutron Capture. [Masters Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17409
University of Guelph
7.
Valbuena Burbano, Sally.
Nuclear Structure of 98Ru using beta decay.
Degree: MS, Department of Physics, 2020, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17759
► A recent survey of potential candidates for spherical vibrational motion concluded that very few passed the criteria; of those that did, 98,100Ru were the most…
(more)
▼ A recent survey of potential candidates for spherical vibrational motion concluded that very few passed the criteria; of those that did, 98,100Ru were the most promising. However, in part this may have been due to the lack of detailed spectroscopic data for 98,100Ru. In order to remedy this, we have performed a high- statistics measurement of the beta decay of 98,100Rh using the newly commissioned beta decay Tape Station at iThemba labs located near Cape Town, South Africa. Activity of 98Rh was produced using fusion evaporation reactions of 12C beams on an 89Y target, which was then transported from the irradiation station to a counting station. The counting station consisted of 4 clover-type HPGe, augmented by a TIGRESS detector, a plastic scintillator, and an in-vacuum Si(Li) detector. The decay of 98Rh to 98Ru was the first measurement to be completed on this facility. Very high-statistics data sets were collected for 98Ru, resulting in considerable expansions of their decay schemes. Several weak E2 transitions were newly observed. The E2 transition to the second 0+ state possesses the largest relative B(E2) value, strongly suggesting that the third 2+ state is a band member of the second excited 0+ band. We have also observed a candidate level for the 4+ rotational band member, suggesting that 98Ru possesses a more-deformed excited 0+ band coexisting with a less-deformed ground state.
Advisors/Committee Members: Garrett, Paul (advisor).
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APA (6th Edition):
Valbuena Burbano, S. (2020). Nuclear Structure of 98Ru using beta decay. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17759
Chicago Manual of Style (16th Edition):
Valbuena Burbano, Sally. “Nuclear Structure of 98Ru using beta decay.” 2020. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17759.
MLA Handbook (7th Edition):
Valbuena Burbano, Sally. “Nuclear Structure of 98Ru using beta decay.” 2020. Web. 03 Mar 2021.
Vancouver:
Valbuena Burbano S. Nuclear Structure of 98Ru using beta decay. [Internet] [Masters thesis]. University of Guelph; 2020. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17759.
Council of Science Editors:
Valbuena Burbano S. Nuclear Structure of 98Ru using beta decay. [Masters Thesis]. University of Guelph; 2020. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/17759
University of Guelph
8.
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
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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 March 03, 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. 03 Mar 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 Mar 03].
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
9.
Bidaman, Harris.
A study on low spin states in 154Gd using the (p, p′ gamma) reaction.
Degree: MS, Department of Physics, 2017, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11590
► The investigation of N = 90 nuclei have been the subject of many experimental studies. These isotones, such as 154Gd and 152Sm, lie at the…
(more)
▼ The investigation of N = 90 nuclei have been the subject of many experimental studies. These isotones, such as 154Gd and 152Sm, lie at the center of a region of rapid shape change between vibrational and rotational characteristics, and demonstrate striking similarities. However, there are competing interpretations for the structure of these transitional nuclei. In order to differentiate between them, a precise level scheme for each nucleus must be established. The low-lying states of 154Gd were then investigated at the
University of Jyväskylä accelerator laboratory in Finland, using the 154Gd(p, p′ gamma) reaction. A proton beam of 12 MeV was used to excite the 154Gd target, with the gamma rays from the reaction detected with the JUROGAM II array, while the LISA charged-particle spectrometer was used for the detection of the inelastically scattered protons. This experiment marked one of the first uses of the LISA spectrometer at Jyväskylä, and helped to distinguish between the (p, p′) reaction, and the much more copious (p, xn) channels. By analysing the peaks obtained from the gamma-gamma, and gamma-gamma-proton coincidence matrices, a decay scheme has been built using the Radware software ESCL8R. A total of 104 excited states are reported, with 36 being newly established in this work. Experimental methods, new transitions, gamma branching ratios, and future steps will be discussed.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: Nuclear
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APA (6th Edition):
Bidaman, H. (2017). A study on low spin states in 154Gd using the (p, p′ gamma) reaction. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11590
Chicago Manual of Style (16th Edition):
Bidaman, Harris. “A study on low spin states in 154Gd using the (p, p′ gamma) reaction.” 2017. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11590.
MLA Handbook (7th Edition):
Bidaman, Harris. “A study on low spin states in 154Gd using the (p, p′ gamma) reaction.” 2017. Web. 03 Mar 2021.
Vancouver:
Bidaman H. A study on low spin states in 154Gd using the (p, p′ gamma) reaction. [Internet] [Masters thesis]. University of Guelph; 2017. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11590.
Council of Science Editors:
Bidaman H. A study on low spin states in 154Gd using the (p, p′ gamma) reaction. [Masters Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11590
10.
Turko, Joseph.
Detector Response Simulations of Hydrocarbon Neutron Scintillators.
Degree: MS, Department of Physics, 2017, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602
► DESCANT is a novel neutron detector array for use in nuclear structure and astrophysics studies with radioactive-ion beams. Comprised of 70 hexagonical deuterated scintillation detectors,…
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▼ DESCANT is a novel neutron detector array for use in nuclear structure and astrophysics studies with radioactive-ion beams. Comprised of 70 hexagonical deuterated scintillation detectors, DESCANT is located at the ISAC facility of TRIUMF, where it can be used in combination with the GRIFFIN or TIGRESS gamma-ray spectrometers in a multitude of nuclear decay and reaction experiments. The deuterated scintillator used in the DESCANT detectors produces a peaked structure in the detector response spectra that can provide neutron energy measurements without using traditional time-of-flight methods. This thesis will present the framework for a comprehensive GEANT4 simulation of the DESCANT array. The capabilities of the G4NeutronHP physics library in accurately reproducing interaction cross-sections below 10 MeV is verified. The G4Scintillation model is then used to investigate the geometric dependence of the light collection process in a single DESCANT detector. This is followed by an extensive study of simulated response functions of two neutron scintillators. The first is a well studied proton-recoil scintillator (NE-213) and the second is a deuteron-recoil scintillator (EJ-315), similar to that which is used by DESCANT. The detector response to mono-energetic neutrons is then measured for the two scintillators using cylindrical detectors with 11.43 cm diameter and 2.54 cm thickness geometries. A parameterization of the light yield is then calculated for both scintillators by conducting a chi-squared minimization between experimental and simulated pulse-height spectra. Finally, the current status of the DESCANT array geometry in GEANT4 is presented.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: Neutron detectors; Detector response function; NE-213; EJ-315; DESCANT; Nuclear physics; Deuterated scintillators; Neutron scintillators; GEANT4; Pulse-height spectra
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APA (6th Edition):
Turko, J. (2017). Detector Response Simulations of Hydrocarbon Neutron Scintillators. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602
Chicago Manual of Style (16th Edition):
Turko, Joseph. “Detector Response Simulations of Hydrocarbon Neutron Scintillators.” 2017. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602.
MLA Handbook (7th Edition):
Turko, Joseph. “Detector Response Simulations of Hydrocarbon Neutron Scintillators.” 2017. Web. 03 Mar 2021.
Vancouver:
Turko J. Detector Response Simulations of Hydrocarbon Neutron Scintillators. [Internet] [Masters thesis]. University of Guelph; 2017. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602.
Council of Science Editors:
Turko J. Detector Response Simulations of Hydrocarbon Neutron Scintillators. [Masters Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602
11.
Jamieson, Andrew Spencer.
The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction.
Degree: MS, Department of Physics, 2014, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7791
► The cadmium isotopes have been cited as excellent examples of vibrational nuclei for decades, with multi-phonon quadrupole, quadrupole-octupole, and mixed-symmetry states proposed. A large amount…
(more)
▼ The cadmium isotopes have been cited as excellent examples of vibrational nuclei for decades, with multi-phonon quadrupole, quadrupole-octupole, and mixed-symmetry states proposed. A large amount of spectroscopic data has been obtained from a variety of experiments, recently focused on gamma-ray studies. In the present work, the single particle structure of 112Cd has been investigated using the 111Cd(d,p)112Cd reaction. The high energy resolution investigation was carried out using a 22 MeV beam of polarized deuterons obtained from the Maier-Leibnitz Laboratory at Garching, Germany. The reaction ejectiles were momentum analyzed using a Q3D magnetic spectrometer, and 129 levels have been identified up to 4.2 MeV of excitation energy. Spin-parity has been assigned to each analyzed level, and angular distributions for the reaction cross sections and analyzing powers were obtained. Optical model calculations have been performed, and the calculated angular distributions were compared with the experimental cross sections and analyzing powers. Many additional levels have been observed compared with the previous (d,p) study performed with 8 MeV deuterons, including strongly populated 5- and 6- states. The former was previously assigned as a member of the quadrupole-octupole quintuplet, based on a strongly enhanced B(E2) value to the 3- state, but is now reassigned as being predominately s1/2 x h11/2 two-quasineutron configuration.
Advisors/Committee Members: Garrett, Paul E. (advisor).
Subjects/Keywords: transfer reactions; direct reactions; vibrational structure; DWBA; ADWA; nuclear structure
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APA (6th Edition):
Jamieson, A. S. (2014). The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7791
Chicago Manual of Style (16th Edition):
Jamieson, Andrew Spencer. “The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction.” 2014. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7791.
MLA Handbook (7th Edition):
Jamieson, Andrew Spencer. “The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction.” 2014. Web. 03 Mar 2021.
Vancouver:
Jamieson AS. The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction. [Internet] [Masters thesis]. University of Guelph; 2014. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7791.
Council of Science Editors:
Jamieson AS. The nuclear structure of 112Cd studied through the 111Cd(d,p)112Cd single neutron transfer reaction. [Masters Thesis]. University of Guelph; 2014. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/7791
12.
Radich, Allison J.
Nuclear Structure of 124Xe Studied with beta+/EC-decay.
Degree: MS, Department of Physics, 2015, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9171
► As part of a broader program to study the evolution of collectivity in the even-even nuclei above tin, a beta+/EC-decay measurement of 124Cs into 124Xe…
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▼ As part of a broader program to study the evolution of collectivity in the even-even nuclei above tin, a beta+/EC-decay measurement of 124Cs into 124Xe was made with the 8pi spectrometer at the TRIUMF-ISAC facility. A very high-statistics data set was collected and the gamma-gamma coincidence data were analyzed, greatly extending the 124Xe level scheme. Several weak E2 transitions into excited 0+ states in 124Xe were observed for the first time. The B(E2) transition strengths of such low-spin transitions are important in determining collective properties, currently poorly characterized in this neutron-deficient region.
A new beta+/EC-decay branch from a high-spin 124Cs isomer was observed for the first time. Decay of the (7)+ isomer populates high-spin excited states in 124Xe that are otherwise inaccessible through the beta decay of the 1+ 124Cs ground state. Combining gamma-gamma and gamma-electron coincidence data, several new transitions in the isomeric decay of 124Cs have been observed.
Advisors/Committee Members: Garrett, Paul (advisor).
Subjects/Keywords: gamma-ray spectroscopy; nuclear physics; beta-decay; TRIUMF; collectivity; branching ratios; nuclear structure
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APA ·
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APA (6th Edition):
Radich, A. J. (2015). Nuclear Structure of 124Xe Studied with beta+/EC-decay. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9171
Chicago Manual of Style (16th Edition):
Radich, Allison J. “Nuclear Structure of 124Xe Studied with beta+/EC-decay.” 2015. Masters Thesis, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9171.
MLA Handbook (7th Edition):
Radich, Allison J. “Nuclear Structure of 124Xe Studied with beta+/EC-decay.” 2015. Web. 03 Mar 2021.
Vancouver:
Radich AJ. Nuclear Structure of 124Xe Studied with beta+/EC-decay. [Internet] [Masters thesis]. University of Guelph; 2015. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9171.
Council of Science Editors:
Radich AJ. Nuclear Structure of 124Xe Studied with beta+/EC-decay. [Masters Thesis]. University of Guelph; 2015. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/9171
13.
Leach, Kyle G.
Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory.
Degree: PhD, Department of Physics, 2012, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4866
► As part of an ongoing program to study fundamental symmetries in nuclear physics, a thorough investigation into shell-model isospin-symmetry-breaking (ISB) calculation theory has been conducted…
(more)
▼ As part of an ongoing program to study fundamental symmetries in nuclear physics, a thorough investigation into shell-model isospin-symmetry-breaking (ISB) calculation theory has been conducted using direct reactions to observe detailed nuclear-structure information. The work presented in this Thesis focuses on the 62Ga superallowed beta-decay system, and consists of two primary experiments; 1) A 64Zn(d,t)63Zn single-neutron transfer reaction, aimed at observing spectroscopic strengths to help guide calculation model-space truncations for the beta-decay wave function radial-overlap component of ISB, and 2) A two-neutron 64Zn(p,t)62Zn transfer to search for excited 0+ states in the daughter nucleus of 62Ga. The experiments were performed at the Maier-Leibnitz-Laboratory, on the joint campuses of the Ludwig-Maximilians Universitat and the Technische Universitat Munchen, in Garching, Germany. In total, 162 states in 63Zn were populated from the 64Zn(d,t) reaction, up to an excitation energy of 4.8 MeV, including the observation of 125 new levels, and unique spin/parity assignments for 92 states. As a result, this work provides the most complete picture for low-spin states in 63Zn to date. A comparison of the extracted S values to the predicted shell-model spectroscopic factors shows an overall over-prediction of strength for the 2p3/2 orbital, and a large disagreement for the 1f7/2 orbital above ~3.5 MeV. No significant 1g9/2 strength was observed, leading to the conclusion that the importance of the 1g9/2 orbital for ISB is small. Additionally, 67 states were observed in 62Zn using the two-neutron pickup mechanism, including the observation of five 0+ states. More than 99% of the total 0+ (p,t) cross-section is observed in the ground-state reaction channel, implying a nearly maximal overlap of the wave functions with the two-nucleon transfer operator. The dominance of the ground-state-to-ground-state (p,t) cross section is strikingly similar to the dominance of the superallowed Fermi beta-decay between isobaric-analogue 0+ states. This suggests that the population of excited 0+ states in the (p,t) reaction may reflect the population in the Fermi decay process, and can be used to guide future experimental and theoretical work. Further discussion of these results as they relate to the ISB correction calculations, and the implications for future theoretical work are presented in this Thesis.
Advisors/Committee Members: Garrett, Paul (advisor), Svensson, Carl (advisor).
Subjects/Keywords: Nuclear Physics; Superallowed beta Decay; Isospin Symmetry Breaking; Fundamental Symmetry; Zinc Nuclear Structure; Shell-Model; Neutron Transfer Reaction
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APA (6th Edition):
Leach, K. G. (2012). Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory. (Doctoral Dissertation). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4866
Chicago Manual of Style (16th Edition):
Leach, Kyle G. “Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory.” 2012. Doctoral Dissertation, University of Guelph. Accessed March 03, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4866.
MLA Handbook (7th Edition):
Leach, Kyle G. “Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory.” 2012. Web. 03 Mar 2021.
Vancouver:
Leach KG. Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory. [Internet] [Doctoral dissertation]. University of Guelph; 2012. [cited 2021 Mar 03].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4866.
Council of Science Editors:
Leach KG. Neutron Transfer Reactions on 64Zn as a Probe for Testing Shell-Model Isospin-Symmetry-Breaking Theory. [Doctoral Dissertation]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/4866
. 
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