Rv. Jolos et Yv. Palchikov, CLUSTERING AND STRONG OCTUPOLE CORRELATIONS IN MEDIUM-MASS AND HEAVY-NUCLEI, Physics of atomic nuclei, 60(7), 1997, pp. 1077-1080
The energies of excited np-nh particle-hole states of the cluster type
(n is the number of nucleons in a cluster) are calculated. It is show
n that the energies of these excitations are minimal in nuclei having
low-lying 1(-) states and Delta I = 1 rotational bands that are built
on ground states and which involve levels of alternating parities.