Abstract
The relationship between the cluster properties of heavy nuclei and the appearance of low-lying collective negative-parity states in these nuclei is discussed. Energies of the cluster typenp-nh particle-hole excited states, wheren is the number of nucleons in a cluster, are calculated. It is shown that the energies of these states take minimal values in nuclei having low-lying collective 1- states and ground-state alternating-parity rotational bands with ΔI = 1. The correlation between the difference of the quadrupole deformations in the potential energy minimum and at the barrier separating two octupole minima and the value of the angular momentum, at which parity splitting disappears, is studied.
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