Shape Change of <SUP>129</SUP>Ce at High Spin States

LI Guang-Sheng; DAI Zheng-Yu; LIU Xiang-An; ZHANG Lan-Kuan; WEN Shu-Xian; WU Xiao-Guang; YUAN Guan-Jun; PENG Chao-Hua; WENG Pei-Kun; LI Sheng-Gang; YANG Chun-Xiang

Chinese Physics C> 2001, Vol. 25> Issue(10) : 984-988

Shape Change of ¹²⁹Ce at High Spin States

China Institute of Atomic Energy, Beijing 102413, China

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Abstract：
High spin states of ¹²⁹Ce were populated through the reaction ¹¹⁶Sn(¹⁶O,3n)¹²⁹Ce at a beam energy of 73 MeV. Lifetimes of the excited states were measured using the Doppler shift atten-uation method. The transition quadrupole moments Qt were deduced from lifetime data. The results indicate that collectivity of ¹²⁹Ce is reduced with respect to the even-even core ¹²⁸Ce. This reduction in collectivity caused by the addition of a h_11/2 neutron can be interpreted as due to triaxial deforma-tion induced by shape driving effect. Although the Qt values of the negaive-parity band are some-what smaller than the ones of the positive-parity band, they exhibit a considerably sindlar behavior with increasing angular momentum. It would appear that the two h_11/2 quasiprotons possibly have a dominant innuence on property of the core.

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LI Guang-Sheng, DAI Zheng-Yu, LIU Xiang-An, ZHANG Lan-Kuan, WEN Shu-Xian, WU Xiao-Guang, YUAN Guan-Jun, PENG Chao-Hua, WENG Pei-Kun, LI Sheng-Gang and YANG Chun-Xiang. Shape Change of ¹²⁹Ce at High Spin States[J]. Chinese Physics C, 2001, 25(10): 984-988.

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Received: 2000-11-03
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Shape Change of ¹²⁹Ce at High Spin States

Corresponding author: LI Guang-Sheng,

China Institute of Atomic Energy, Beijing 102413, China

Received Date: 2000-11-03

Accepted Date: 1900-01-01

Available Online: 2001-10-05

Abstract: High spin states of ¹²⁹Ce were populated through the reaction ¹¹⁶Sn(¹⁶O,3n)¹²⁹Ce at a beam energy of 73 MeV. Lifetimes of the excited states were measured using the Doppler shift atten-uation method. The transition quadrupole moments Qt were deduced from lifetime data. The results indicate that collectivity of ¹²⁹Ce is reduced with respect to the even-even core ¹²⁸Ce. This reduction in collectivity caused by the addition of a h_11/2 neutron can be interpreted as due to triaxial deforma-tion induced by shape driving effect. Although the Qt values of the negaive-parity band are some-what smaller than the ones of the positive-parity band, they exhibit a considerably sindlar behavior with increasing angular momentum. It would appear that the two h_11/2 quasiprotons possibly have a dominant innuence on property of the core.

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Shape Change of 129Ce at High Spin States

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Shape Change of 129Ce at High Spin States

Corresponding author: LI Guang-Sheng,

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Shape Change of ¹²⁹Ce at High Spin States

Shape Change of ¹²⁹Ce at High Spin States