Influence of Valence Nucleon on Shape Change in <SUP>131</SUP>Ce and <SUP>131</SUP>Pr

LI Guang-Sheng; MENG Rui; ZHU Li-Hua; ZHANG Zhen-Long; WU Xiao-Guang; WANG Yue; WANG Zhi-Min; WEN Shu-Xian; LU Jing-Bin; ZHAO Guang-Yi; LI Xian-Feng; WEN Li-Jun; ZHEN Y

Chinese Physics C> 2005, Vol. 29> Issue(3) : 240-244

Influence of Valence Nucleon on Shape Change in ¹³¹Ce and ¹³¹Pr

China Institute of Atomic Energy,Beijing 102413,China2 Department of Physics,Jilin University,Changchun,130023,China

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Abstract：
The 95 MeV ¹⁹F beam projects on an enriched 116Sn target with backing.The γ-ray emitted from evaporation-residual nuclei were detected in γ-γ coincidence measurement by using 11 BGO Compton suppressed HPGe detectors. Lifetimes of the high spin states for ¹³¹Ce and ¹³¹Pr were determined through analysis of the Doppler broadened line shapes. The transition quadrupole moments extracted from the measured lifetimes demonstrate that change in nuclear shape occurs at band crossing region. From a comparison with the neighbouring even-even nucleus ¹³⁰Ce it follows that influence of the valence neutron is stronger than that of the valence proton on shape change of the core.

References

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. berg S. Phys. Scr. , 1982, 25: 23-272. LI Guang-Sheng, YANG Li-Ming, DAI Zheng-Yu et al. HEP NP,2002, 26( 8) : 809-813 (in Chinese)(李广生,杨利明,戴征宇等,高能物理与核物理,2002, 26(8):809-813 )3. Blaugrund A E. Nucl . Phys. , 1966, 88: 5014. LI G S, DAI Z Y, WEN S X et al . Z. Phys. , 1996, A356 ( 2) :119-1235. LI Guang-Sheng, DAI Zheng-Yu, LIU Xiang-An et al. Chin. Phys.Lett . , 1998, 15(8) : 564- 565

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LI Guang-Sheng, MENG Rui, ZHU Li-Hua, ZHANG Zhen-Long, WU Xiao-Guang, WANG Yue, WANG Zhi-Min, WEN Shu-Xian, LU Jing-Bin, ZHAO Guang-Yi, LI Xian-Feng, WEN Li-Jun, ZHEN Y, Influence of Valence Nucleon on Shape Change in ¹³¹Ce and ¹³¹Pr[J]. Chinese Physics C, 2005, 29(3): 240-244.

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Received: 2004-08-25
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Valence Nucleon on Shape Change in ¹³¹Ce and ¹³¹Pr

Corresponding author: LI Guang-Sheng,

China Institute of Atomic Energy,Beijing 102413,China2 Department of Physics,Jilin University,Changchun,130023,China

Received Date: 2004-08-25
Accepted Date: 1900-01-01
Available Online: 2005-03-05

Abstract: The 95 MeV ¹⁹F beam projects on an enriched 116Sn target with backing.The γ-ray emitted from evaporation-residual nuclei were detected in γ-γ coincidence measurement by using 11 BGO Compton suppressed HPGe detectors. Lifetimes of the high spin states for ¹³¹Ce and ¹³¹Pr were determined through analysis of the Doppler broadened line shapes. The transition quadrupole moments extracted from the measured lifetimes demonstrate that change in nuclear shape occurs at band crossing region. From a comparison with the neighbouring even-even nucleus ¹³⁰Ce it follows that influence of the valence neutron is stronger than that of the valence proton on shape change of the core.