Investigating Shape Coexistence in <sup>100</sup>Zr
ORAL
Abstract
Shape coexistence can be found in many regions of the nuclear chart and is often associated with the presence of low-lying 0+ states. In the Zr isotopes with neutron number near N=60, there is also a rapid onset of deformation of the ground state band as the neutron number is increased from 98Zr to 100Zr. In addition, multiple shapes are predicted via Monte-Carlo shell-model calculations. The spherical configuration that forms the ground state in 98Zr is predicted to migrate upwards in energy to become the 04+ state in 100Zr, while the configuration forming the deformed 02+ state in 98Zr descends in energy to become the ground state in 100Zr. In order to probe the nature of the excitations, a β decay experiment has been performed using the GRIFFIN γ ray spectrometer at the TRIUMF-ISAC facility. States populated by the decay of 100Y were investigated through γ ray spectroscopy, which includes γ-γ angular correlations to establish level spins and transition multipole mixing ratios. Lifetimes of states and conversion electron intensities were also measured using LaBr3(Ce) and Si(Li) detectors, respectively. The current status of the analysis, and the implications of the results on the structure will be discussed.
*This work was supported by the Natural Sciences and Engineering Research Council of Canada. The GRIFFIN infrastructure was funded jointly by the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the British Columbia Knowledge Development Fund, TRIUMF and the University of Guelph. TRIUMF receives funding through a contribution agreement with the National Research Council Canada.
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Presenters
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Harris Bidaman
- University of Guelph