Hexadecapole Interaction and the Delta I=4 Staggering Effect in Rotational Bands

Abstract

A role of the multipole interaction in the description of the $\triangle I$=4 staggering phenomenon is investigated in a model consisting of a single-$j$ shell filled by identical nucleons. Exact diagonalization of the quadrupole-plus-hexadecapole Hamiltonian shows that the hexadecapole-hexadecapole interaction can produce a $\triangle I$=4 periodicity in the yrast sequence.Comment: revised version with technical changes only, to be published in Physica Scripta, latex, 4 pages, 3 PostScript figures available on request from [email protected], preprint No. IFT/18/9