Abstract
The lifetimes of the first 2 states in the neutron-deficient Sr isotopes were measured using a unique combination of the -ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2 states were determined to be fm for Sr and 1800(250) fm for Sr, corresponding to large deformation of 0.45(3) for Sr and 0.40(3) for Sr. The present data provide experimental evidence for mutually enhanced collectivity that occurs at 38. The systematic behavior of the excitation energies and values indicates a signature of shape coexistence in Sr, characterizing Sr as one of most deformed nuclei with an unusually reduced (4)(2) ratio.
- Received 7 October 2011
DOI:https://doi.org/10.1103/PhysRevC.85.041303
©2012 American Physical Society