Abstract
A dipole band of six transitions built upon a firmly established isomeric state has been identified in using recoil-isomer tagging. This is the lightest odd-mass Pb nucleus in which a dipole band is known. The dipole nature of the new transitions has been confirmed through angular-intensity arguments. The evolution of the excitation energy and the aligned-angular momentum of the states in the new dipole band are compared with those of dipole bands in heavier, odd-mass lead isotopes. This comparison suggests that the new band in is based upon a configuration. However, the increased aligned-angular momentum in may suggest evidence for a reduced repulsive proton/neutron-hole interaction compared to dipole bands in the heavier mass isotopes.
- Received 1 May 2015
- Revised 12 October 2015
DOI:https://doi.org/10.1103/PhysRevC.92.054312
©2015 American Physical Society