Effective decoupling in some odd-A odd-Z rotational bands

A systematic analysis of the results of single quasiparticle-plus-rotor band mixing calculations is presented wherein the empirically noticed characteristic effective decoupling patterns and their systematics in certain odd-A odd-Z rotational bands based on hsub(9/2), dsub(5/2), hsub(11/2) and gsub(7/2) orbitals are reproduced. The strategy adopted allows one to obtain an almost unique set of parameter values for a given decoupling pattern. The composition of wavefunctions in terms of core rotational angular momentum supports the idea of effective decoupling. These wavefunctions are then used to analyse the extent and nature of Coriolis coupling in these bands. It is found that either o ne or both parts of the Coriolis energies, diagonal and non-diagonal, are significant in most of the cases and the non-diagonal part is mainly responsible for the effective decoupling. These Coriolis effects prominently affect the intraband B(M1) and B(E2) values and their variation with spin is discussed. An unusual feature in the B(M1) value of the hsub(9/2) orbital based band is pointed out. (author). 28 refs., 14 figs