Lifetimes of High Spin Yrast States in Odd-Proton Nucleus 131Pr
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LI Guang-Sheng,
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MENG Rui,
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ZHU Li-Hua,
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ZHANG Zhen-Long,
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WANG Yue,
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WANG Zhi-Min,
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WEN Shu-Xian,
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LU Jing-Bin,
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ZHAO Guang-Yi,
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LI Xian-Feng,
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WEN Li-Jun,
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ZHENG Yong-Nan,
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ZHENG Yong,
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LIU Yun-Zuo,
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YUAN Guan-Jun,
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YANG Chun-Xiang
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Abstract
Lifetimes of the high spin yrast states in the odd-proton nucleus 131Pr have been determined by analysing the Doppler broadened line shapes for the de-exciting γ-rays following the 116Sn(19F, 4n)131Pr reaction at a bombarding energy of 95 MeV. The transition quadrupole moments extracted from the measured lifetimes exhibit a considerable reduction near the rotational frequency of 0.42 MeV, at which the J(1) and J(2) moments of inertia indicate a band crossing. The experimental result demonstrates occurrence of the nuclear shape change induced by band crossing associated with the alignment of a pair of h11/2 protons.
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