NUCLEAR PHYSICS |
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Lifetime Measurement of the Low Lying Yrast States in 189Pt |
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 |
China Institute of Atomic Energy, Beijing 102413 |
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Cite this article: |
HE Chuang-Ye, WU Xiao-Guang, WANG Jin-Long et al 2013 Chin. Phys. Lett. 30 112101 |
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Abstract High-spin states in 189Pt are populated through the heavy-ion fusion-evaporation reaction176Yb (18O, 5n)189Pt at 87 MeV beam energy. An array consisting of 13 HPGe detectors is used in conjunction with the plunger device in CIAE. The lifetimes of two levels in the yrast band are determined by using the recoil distance Doppler shift method. The transition quadrupole moments Qt are extracted. The results show that the 17/2+ state has a much larger Qt value than that of the ground state, whereas the value deceases quickly with spin increasing. This may contribute to the shape driving effect of the quasi-neutron from the em13/2 orbital.
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Received: 28 June 2013
Published: 30 November 2013
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