B. Ding

Lifetime measurement of the first excited state in S37

Lifetime of the 3/2(-) first excited state in S-37 populated by the beta(-) decay of P-37 has been measured using beta-gamma.delayed coincidence technique. The B(E2; 7/2(-) -> 3/2(-)) value in S-37 deduced from the lifetime comes close to the B(E2; 0(+) -> 2(1)(+)) value in weakly deformed S-38 but deviates significantly from that in spherical S-36. This manifests that S-37 is a weakly deformed rather than spherical nucleus.

Rotational band properties in {sup 165}Er

High-spin states in {sup 165}Er have been studied experimentally using the {sup 160}Gd({sup 9}Be, 4n) reaction at beam energies of 42 and 45 MeV. The previously known bands based on the 5/2{sup +}[642], 5/2{sup -}[523], and 11/2{sup -}[505] configurations are extended to (49/2{sup +}), (45/2{sup -}), and (31/2{sup -}) states, respectively. The rotational bands in {sup 165}Er generally show gradual alignment processes, indicating strong band interactions associated with the i{sub 13/2} neutron alignments. The band properties are compared with those in the neighboring nuclei and discussed within the framework of the cranked shell model.

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.

Signature inversion in the 7/2−[503] band of 185Pt

High-spin states in 185Pt have been investigated using the 173Yb(16O, 4n) reaction at a beam energy of 90 MeV. The 7/2?[503] band in 185Pt is revised, and particularly the intra-band B(M1)/B(E2) ratios are deduced experimentally. Low-spin signature inversion is revealed in the 7/2?[503] band. The signature inversion can be interpreted if we assume configuration change in this band from the 7/2?[503] orbital to the 7/2?[514] orbital with increasing spin, which is supported by comparing the measured B(M1)/B(E2) ratios with the theoretical values from the semi-classical D?nau and Frauendorf approach.