Wednesday, July 3, 2013

1307.0179 (He Chuang-Ye et al.)

Lifetime measurement of the low lying yrast states in 189Pt    [PDF]

He Chuang-Ye, Wu Xiao-Guang, Wang Jin-Long, Wu Yi-Heng, Zheng Yun, Li Guang-Sheng, Li Cong-Bo, Hu Shi-Peng, Li Hong-Wei, Liu Jia-Jian, Luo Peng-Wei, Yao Shun-He
Lifetimes of the positive-parity yrast band in 189Pt were measured using the recoil distance Doppler-shift method. A HPGe detector array consisting of 13 detectors was used in conjunction with the plunger device in CIAE. Excited states of 189Pt were populated by the 176Yb (18O, 5n) 189Pt fusion-evaporation reaction at a beam energy 87 MeV. The lifetimes of two levels belonging to the yrast band are measured. The results show that the 17/2+ state in the yrast band has large Qt value, but it deceases quickly with spin increasing. It may be contributed from the shape driving effect of the quasi-neutron from the i13/2 oribital.
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