Excitation Study of High-Lying States of Differently Shaped Heavy Nuclei by the Method of Two-Step Cascades

摘要

Recently obtained primary transition intensities from two-step gamma-ray cascade investigation in 14 heavy nuclei: (sup 137),(sup 138),(sup 139)Ba, (sup 146)Nd, (sup 150)Sm, (sup 156),(sup 158)Gd, (sup 160)Tb, (sup 164)Dy, (sup 168)Er, (sup 174)Yb, (sup 181)Hf, (sup 196)Pt, (sup 198)Au are analyzed. Experiments based on thermal neutron capture were undertaken mainly at the Frank Laboratory of Neutron Physics. Comparing these measured intensities and statistical model predictions, some properties of compound-state depopulation were derived. For the spherical nuclei of (sup 137),(sup 138),(sup 139)Ba and (sup 146)Nd very intense cascades with high-energy primary transitions were observed. Rather different is the behaviour of the cascade intensity in the strongly deformed nuclei of (sup 156),(sup 158)Gd, (sup 160)Tb, (sup 164)Dy, (sup 168)Er and in transitional nucleus of (sup 150)Sm -intensity of primary gamma-rays with E(sub 1) (approx) 2-3 MeV overestimates the calculated value by more than one order of magnitude. 22 refs., 5 figs., 3 tabs. (Atomindex citation 26:043138)