Abrupt shape transition at neutron number N=60: B(E2) values in Sr94,96,98 from fast γγ timing

J.-M. Régis et al.
Phys. Rev. C 95, 054319 – Published 23 May 2017; Erratum Phys. Rev. C 95, 069902 (2017)

Abstract

Lifetimes of low-lying yrast states in neutron-rich Sr94,96,98 have been measured by Germanium-gated γγ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of U235 and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.

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  • Received 21 February 2017

DOI:https://doi.org/10.1103/PhysRevC.95.054319

©2017 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsNuclear Physics

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Vol. 95, Iss. 5 — May 2017

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