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Lifetimes of Excited Levels in 131Ce |
| LI Guang-Sheng1;MENG Rui2;ZHU Li-Hua1;ZHANG Zhen-Long2;WANG Yue2;WANG Zhi-Min1;WEN Shu-Xian1;LU Jing-Bin2;ZHAO Guang-Yi2;LI Xian-Feng2;WEN Li-Jun2;ZHENG Yong-Nan1;ZHENG Yong3;LIU Yun-Zuo2;YUAN Guan-Jun1;YANG Chun-Xiang1 |
| 1China Institute of Atomic Energy, Beijing 102413
2Department of Physics, Jilin University, Changchun 130023
3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 |
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| Cite this article: |
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LI Guang-Sheng, MENG Rui, ZHU Li-Hua et al 2004 Chin. Phys. Lett. 21 461-463 |
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Abstract The fusion--evaporation reaction 116Sn (19F, p3n) 131Ce at projectile energy of 95 MeV is used to populate high spin states in 131Ce. The de-exciting γ-rays are detected in γ-γ coincidence measurement with Compton-suppressed BGO-HPGe detectors. Level lifetimes of 131Ce were determined by using the Doppler shift attenuation method. The experimental results indicate that collectivity of 131Ce is reduced relative to that of 130Ce and it follows that deformation decreases with increase of the neutron number on the basis of systematic comparison of transition quadrupole moments for the light cerium isotopes.
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| Keywords:
21.10.Tg
23.20.-g
27.60.+j
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Published: 01 March 2004
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