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You searched for +publisher:"University of Guelph" +contributor:("Garrett, Paul E."). Showing records 1 – 3 of 3 total matches.

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University of Guelph

1. 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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

2. Diaz Varela, Alejandra. Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In.

Degree: MS, Department of Physics, 2013, University of Guelph

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 April 11, 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. 11 Apr 2021.

Vancouver:

Diaz Varela A. Nuclear Structure Investigation of 110Cd through Beta-Decay of 110In. [Internet] [Masters thesis]. University of Guelph; 2013. [cited 2021 Apr 11]. 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

3. 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

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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 11, 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. 11 Apr 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 Apr 11]. 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

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