Single-particle and collective structures in neutron-rich Sr isotopes

Abstract

Neutron-rich Sr nuclei around N=60 exhibit a sudden shape transition from spherical ground state to strongly prolate-deformed. Recently, a lot of new insight into the structure of Sr isotopes in this region was gained through experimental studies of excited levels, transitions strengths and spectroscopic factors. In this work, a "classic" shell-model description of strontium isotopes from N=50 to N=58 is provided, using a natural valence space outside the 78Ni core. Both even-even and even-odd isotopes are adressed. In particular, spectroscopic factors are computed to shed more light on the structure of low-energy excitations and their evolution along the Sr chain. The origin of deformation at N=60 is commented in the context of the present and previous shell-model and Monte-Carlo shell-model calculations.

14 pages, 8 figures

References in corpus (5)

• Collectivity in the light Xenon isotopes: A shell model study
• The subtle connection between shape coexistence and quantum phase transition. The Zr case
• Proxy-SU(3) symmetry in the shell model basis
• Connecting the proxy-SU(3) symmetry to the shell model
• Single-particle structure in neutron-rich Sr isotopes approaching the N = 60 shape transition

Cited by in corpus (2)

• The proxy-SU(3) symmetry in atomic nuclei
• Configuration mixing and intertwined quantum phase transitions in odd-mass niobium isotopes