REFLECTION ASYMMETRIC DEFORMATION AND CLUSTERING IN HEAVY-NUCLEI

The relationship between the cluster properties of heavy nuclei and th e appearance of low-lying collective negative-parity states in these n uclei is discussed. Energies of the cluster type np-nh particle-hole e xcited states, where n is the number of nucleons in a cluster are calc ulated. It is shown that the energies of these states take minimal val ues in nuclei having low-lying collective 1(-) states and ground-state alternating-parity rotational bands with Delta I = 1. The correlation between the difference of the quadrupole deformations in the potentia l energy minimum and at the barrier separating two octupole minima and the value of the angular momentum, at which parity splitting disappea rs, is studied.