Nuclear Structure and Dynamics

Coexisting shapes in strontium

The shape of an atomic nucleus is a result of a delicate interplay between macroscopic, liquid drop-like and microscopic shell structure effects. Nuclei with a closed shell configuration are spherical in their ground states, but away from magic numbers deformed ground states are observed. Small changes in the nucleon number can lead to rapid changes in deformation and states of different deformation can coexist at close excitation energies. In the first ISAC experiment with a post-accelerated heavy beam, recently published in Physics Letters B, the shape coexistence in 96Sr was studio with TIGRESS and SHARC by means of the d(95Sr,p) transfer reaction. These results suggest coexistence of three different configurations in 96Sr and strong shape mixing of two excited 0states.