Study on the formation of the composite system of 238U+238U

中国物理C, 2009, 33(z1): 30-32.

^1, , ^2, , ^3, , ^4, , ^5,

1.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

2.Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China;Beijing Radiation Center, Beijing 100875, China

3.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

4.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

5.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China;Institute of Theoretical Physics, Chinese Academic of Science, Beijing 100080, China

基金项目: 国家重点基础研究发展规划(973计划)(2007CB209900) 国家自然科学基金(10235030;10675172)

Study on the formation of the composite system of 238U+238U

WU Xi-Zhen ^1, , TIAN Jun-Long ^2, , ZHAO Kai ^3, , ZHANG Ying-Xun ^4, , LI Zhu-Xia ^5,

1.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

2.Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China;Beijing Radiation Center, Beijing 100875, China

3.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

4.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China

5.China Institute of Atomic Energy, P.O. Box 27518, Beijing 102413, China;Institute of Theoretical Physics, Chinese Academic of Science, Beijing 100080, China

Keywords： ImQMD model

Strongly damped reactions of 238U+238U, at Ecm = 680-1880 MeV have been studied based on the improved quantum molecular dynamics model. We find that at a certain energy region the entrance channel potential is weakly repulsive and the dissipation is very strong after touching configuration, these two effects make the time delay of re-separation for colliding system. The single particle potential well of the transiently formed composite system has Coulomb barrier about 15-20 MeV high at the surface, which makes the excited unbound protons being still embedded in the potential well and moving in a common mono-single particle potential for a period of time and thus restrains from quick decay of the composite system.

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Study on the formation of the composite system of 238U+238U

参考文献