L. Ma

Identification of the {gamma}-vibrational band built on the 11/2{sup -}[505] orbital in {sup 165}Er

Excited states in {sup 165}Er have been populated using the {sup 160}Gd({sup 9}Be, 4n) reaction at beam energies of 42 and 45 MeV. A band consisting of two levels at excitation energies of 1317.6 and 1505.9 keV, both of which decay strongly to the 11/2{sup -}[505] band, is observed and assigned as the {gamma}-vibrational band built on the 11/2{sup -}[505] configuration. In addition, a newly identified level is proposed as a three-quasiparticle state.

Band properties of the transitional nucleus 189Pt

High‐spin states in 189Pt have been studied with the in‐beam γ‐spectroscopy method via the 176Yb(18O,5n) reaction at beam energies of 88 MeV and 95 MeV. A new level scheme of 189Pt has been established. Rotational bands based on the υi13/2−1, υf5/2(p3/2) and υi13/2−2υf5esol2(p3/2) configurations, as well as several structures with irregular level spacings, have been observed. Properties of rotational bands have been analyzed in the framework of triaxial particle‐rotor model. A γ~−30° triaxial shape and a near prolate shape have been proposed to the υi13/2−1 and υf5/2(p3/2) bands, respectively. Two ΔIu2009=u20092 transition sequences with similar energies have been observed, and they have been proposed to be associated with the υi13/2−2υf5/2(p3/2) configuration. According to the relevant Nilsson orbitals, the bands built on the υi13/2−2υf5/2(p3/2) configuration could be interpreted as a pair of pseudo‐spin partner.