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

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 17, 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. 17 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 17]. 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

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