Abstract
The strength distributions of Gamow-Teller (GT) transitions from and are investigated. We study where the GT strengths of the transitions ( ) are located incorporating quenching effects due to the Δ-hole contributions. The connection between the GT sum rule and effects of the halo structure of are discussed. The narrowing of the gap between the shell and the shell is found to change the structure of the GT strength distribution. The accuracy of the present calculation is tested for the GT decay from We further study the GT transition from The narrowing of the gap between the and shells varies the transition strength to as well as the GT distribution. The quenching of the transition strength suggests an enormous breaking of the neutron closed-shell structure of
- Received 9 December 1996
DOI:https://doi.org/10.1103/PhysRevC.56.847
©1997 American Physical Society