Abstract
A -decaying high-spin isomer in , with a half-life , has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of on a target. From the half-life and the observed decays in the daughter nucleus, , we conclude that the -decaying state is the long predicted “spin-gap” isomer. Shell-model calculations, using the Gross-Frenkel interaction and the model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the gaps and the Gamow-Teller strength, distributions have been studied via large-scale shell-model calculations using the model space to compare with the experimental value obtained from the half-life of the isomer.
- Received 10 August 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.172502
© 2011 American Physical Society