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 78 Ni 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.