Abstract
The decay of on-line mass-separated to is studied by spectroscopy. The revised decay scheme adds further evidence of the coexistence of very different shapes in A set of levels is proposed to originate from particle-hole pair excitations across the spherical gap in analogy with A deformed band with probable even parity is built on a 7.1-ns isomer at 1838 keV. It is interpreted as a two-quasineutron excitation in accordance with a quantum Monte Carlo pairing calculation based on a deformed shell model. Configurations of the calculated lowest-lying two-quasiparticle levels confirm the importance of the [404]9/2 neutron orbital at the largest deformations in the neutron-rich region.
- Received 17 September 2001
DOI:https://doi.org/10.1103/PhysRevC.65.024318
©2002 American Physical Society