K-forbidden transition probabilities

Abstract

Reduced hindrance factors of K-forbidden transitions are compiled for nuclei with A ∼ 180 where γ-vibrational states are observed. Correlations between these reduced hindrance factors and a Coriolis forces, statistical level mixing and γ-softness have been studied. It is demonstrated that the K-forbidden transitions probabilities are related to γ-softness. The decay of the high-K bandheads has been studied by means of the two-state mixing, which would be induced by the γ-softness, with the use of a number of K-forbidden transitions compiled in the present work, where high-K bandheads are depopulated by both E2 and ΔI = 1 transitions. The validity of the two-state mixing scheme has been examined by using the proposed identity of the B(M1)/B(E2) ratios of transitions depopulating high-K bandheads and levels of low-K bands. A break down of the identity might indicate that other levels would mediate transitions between high- and low-K states.