Investigation of the Excited States of 114Sn Using the GRIFFIN Spectrometer at TRIUMF

Synopsis

This thesis focuses on studying the nuclear structure of the semi-closed-shell isotope of tin, 114Sn. The excited states of this nucleus were populated through the β+/electron capture decay of 114Sb. The experiment was carried out at the TRIUMF-ISAC facility using the GRIFFIN gamma-ray spectrometer. Analysis of the resulting γ-ray spectra led to the identification of 270 newly observed transitions. In total, these transitions establish 45 newly observed energy levels, and additionally allow the assignment of 14 previously unplaced γ-ray transitions. The half-life of 114Sb was measured in this work and compared with values reported in the literature. The intensities of the gamma rays and the branching ratios of the transitions were also calculated, which helped in building a level scheme for 114Sn. The logft values, which characterize β-decay transition strengths, were determined, and spin and parity assignments were made for the newly identified states. The spin and parity assignments made in this study contribute to a more complete level scheme for 114Sn and provide a solid foundation for future spectroscopic investigations in the Sn region.

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