Shape coexistence and mixing of low-lying 0 + states in 96Sr

摘要

The low energy excited02,3+states in96Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron[2s1/2]2content of the01,2,3+states in96Sr was determined by means of the d(95Sr,?p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the96Sr ground and 1229 keV0+states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of theγ-decay of the isomeric03+state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited0+states in96Sr. The strengths of the excited02,3+states were also analyzed within a two-level mixing model and are consistent with a mixing strength ofa2=0.40(14)and a difference in intrinsic deformations of|Δβ|=0.31(3). These results suggest coexistence of three different configurations in96Sr and strong shape mixing of the two excited0+states.