Abstract
Using a shell model which is capable of describing the spectra of upper -shell nuclei close to the line, we study the structure of two isomeric states and in the odd-odd nucleus . It is found that both isomeric states exhibit a large collectivity. The state is oblately deformed, and is suggested to be a shape isomer in nature. The state becomes isomeric because of level inversion of the and states due to core excitations across the shell gap. Calculation of spectroscopic quadrupole moment indicates clearly an enhancement in these states due to the core excitations. However, the present shell model calculation that produces the level inversion cannot accept the large-deformation picture of Mukha et al. [Nature (London) 439, 298 (2006)].
7 More- Received 18 January 2008
DOI:https://doi.org/10.1103/PhysRevC.77.064304
©2008 American Physical Society