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

Shape Change of¹²⁹Ce 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 _11/2neutron 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 _11/2quasiprotons 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 of¹²⁹Ce 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 of¹²⁹Ce were populated through the reaction¹¹⁶Sn(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 of¹²⁹Ce is reduced with respect to the even-even core¹²⁸Ce. This reduction in collectivity caused by the addition of a h_11/2neutron 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_11/2quasiprotons possibly have a dominant innuence on property of the core.

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Shape Change of¹²⁹Ce at High Spin States

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通讯作者:陈斌, bchen63@163.com

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