Abstract
Delayed γ rays from neutron-rich A = 97 fission fragments were measured using the Lohengrin spectrometer at the high-flux reactor of the Institut Lau
Highlights
Shape transitions in the A ≈ 100 region have been the subject of intense studies lately
The determined lifetimes within this work are compared to an interacting boson-fermion model calculation that is based on the microscopic energy density functional to provide a better understanding of the spherical-deformed border in strontium isotopes
By increasing the number of neutrons crossing N = 60 a rapid change in ground-state deformation is observed, which results in a prolate-deformed ground-state rotational band in 98Sr
Summary
Shape transitions in the A ≈ 100 region have been the subject of intense studies lately. Further there is experimental evidence in 98Sr and 100Zr for an additional prolate-oblate shape coexistence [8,9,10], which is underlined by theoretical calculations [11,12] This variety of different structures and configurations causes the complexity of this region and provides a lot of potential to understand the transition from single-particle to collective behavior. A possible description of the deformed states is given by the fact that once the neutron νg7/2 orbit is being filled an interaction between νg7/2 and π g9/2 causes the proton subshell to vanish and results in a collective motion [15,16,17].
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