Abstract
Alpha- and beta-decay studies of mass-separated Rn and At nuclei reveal the existence of a low-lying state in . The excited states are interpreted as proton-pair excitations across the shell gap leading to a deformed state, coexisting with the spherical ground state. It is shown that with decreasing neutron number the deformed configuration intrudes to lower excitation energy, increasingly mixing into the ground state.
- Received 28 April 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.4571
©1995 American Physical Society