Abstract
We report on the first low-energy Coulomb excitation measurements with radioactive beams of odd-odd nuclei . The beams were produced at ISOLDE, CERN and were post-accelerated by REX-ISOLDE to . rays were detected with the MINIBALL spectrometer. The beam was used to study the multiplet of states (, , , ) arising from the configuration. The state of the multiplet was populated via Coulomb excitation and the value was determined in both nuclei. The results obtained illustrate the fragile stability of the shell and subshell closures. A comparison with large-scale shell-model calculations using the core shows the importance of the proton excitations across the shell gap to the understanding of the nuclear structure in the neutron-rich nuclei with .
- Received 5 December 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.122701
©2007 American Physical Society