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Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature

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dc.contributor.advisor Garrett, Paul E. Chagnon-Lessard, Sophie 2012-08-03 2012-08-09T14:23:58Z 2012-08-09T14:23:58Z 2012-08-09
dc.description.abstract 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. en_US
dc.description.sponsorship This work has been supported in part by the Natural Sciences and Engineering Research Council of Canada. en_US
dc.language.iso en en_US
dc.subject nuclear structure en_US
dc.subject 152Sm en_US
dc.subject tetrahedral symmetry en_US
dc.subject inelastic scattering en_US
dc.title Structure of 152Sm with (d,d') reactions in search of a tetrahedral symmetry signature en_US
dc.type Thesis en_US Physics en_US Master of Science en_US Department of Physics en_US

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