Abstract
Rotational bands feeding the ground state and the isomeric state in the proton emitter were observed using the recoil-decay tagging method. This constitutes direct evidence that is deformed. A quadrupole deformation of was deduced for the ground state from the extracted dynamic moment of inertia. Based on observed band crossings and signature splittings the and configurations were proposed for the ground state and the isomeric state, respectively. Comparison with particle-rotor calculations for indicates, however, that may have significant hexadecapole deformation and could be triaxial in the ground state.
- Received 31 July 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.1458
©2001 American Physical Society