Lifetimes of High Spin States in an Odd-Proton Nucleus 129Cs

• Published in: Chinese physics letters Vol. 27; no. 2; pp. 54 - 57
• Main Author: 王烈林 竺礼华 陆景彬 吴晓光 李广生 郝昕 郑云 贺创业 汪雷 李雪琴 刘颖 潘波 赵延新 李忠宇 丁怀博
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: H11; 四极矩; 多普勒频移; 奇质子核; 负宇称带; 转移概率; 高自旋态
• ISSN: 0256-307X; 1741-3540

Lifetimes of high spin states in 129Cs axe measured using the Doppler shift attenuation method. The high spin states of 129 Cs axe populated following the fusion evaporation reaction 124 Sn（UB, 6n）129 Cs at a beam energy of 65 MeV. The reduced transition probabilities B（E2） and the transition quadrupole moments Qt in the negativeand positive-paxity bands are deduced. The experimental results indicate that the Qt values of the negative parity band are smaller than those of the positive parity bands, probably due to different γ-deformation driving effects of different proton orbitals. The Qt values exhibit a considerable increase near the band crossing region in these bands. This behavior demonstrates that nuclear shape changing results from the neutron or proton alignments. The signature splitting of the πh11/2 and πg7/2 bands shows the opposite changing trend after backbending due to the h11~2 neutron and h11/2 proton alignments, respectively.