Abstract
The four proton-hole nucleus was populated in the fragmentation of an GeV beam. The yrast structure of has been observed up to angular momentum by detecting delayed -ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of , , and and half-lives of , s, and s, respectively. The structure of the magic nucleus is discussed and understood in terms of the spherical shell model. The data suggest a revision of the two-body interaction for , , which determines the evolution of nuclear structure toward the r-process waiting point nuclei.
- Received 31 March 2008
DOI:https://doi.org/10.1103/PhysRevC.78.061302
©2008 American Physical Society