Abstract
Mass-separated sources of (separated as ) were used to study the level structure of following alpha decay. The levels in are interpreted in terms of K=1/, 3/, and 5/ parity doublet bands which have a natural theoretical explanation in terms of reflection asymmetric models. The 9/ ground-state member of the K=1/ band in can be understood in terms of both reflection asymmetry and the collapse of the quadrupole-octupole Nilsson orbitals towards the orbitals of spherical symmetry. Comparison of the K=1/ ground-state bands in and reveals the details of this transformation. Theoretical analysis of the microscopic structure of several of the positive-parity bands indicates the presence of important Nilsson configurations arising from the shell below.
- Received 8 November 1990
DOI:https://doi.org/10.1103/PhysRevC.44.676
©1991 American Physical Society