Abstract
The values for transitions in and were deduced from a Coulomb excitation experiment at the safe energy of MeV/nucleon using post-accelerated beams of at the REX-ISOLDE on-line isotope mass separator facility. The emitted rays were detected by the MINIBALL -detector array, and values were obtained from the yields normalized to the known strength of the transition in the target. The comparison of these new results with the data of less neutron-rich gallium isotopes shows a shift of the collectivity toward lower excitation energy when adding neutrons beyond . This supports conclusions from previous studies of the gallium isotopes, which indicated a structural change in this isotopic chain between and . Combined with recent measurements from collinear laser spectroscopy showing a spin and parity for the ground state, the extracted results revealed evidence for a doublet near the ground state in differing by at most keV in energy.
- Received 30 September 2010
DOI:https://doi.org/10.1103/PhysRevC.82.064309
© 2010 The American Physical Society