Chinese Physics C > 2006, Vol. 30 > Issue(12): 1175-1179

Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus²⁶⁶Hs

LIU Zu-Hua^,,
BAO Jing-Dong

China Institute of Atomic Energy, Beijing 102413, China2 Department of Physics, Beijing Normal University, Beijing 100875, China

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Abstract：
For the ²⁶Mg+ ²⁴⁴Cm, ²⁷Al+ ²⁴³Am and ³²S+ ²³⁸U systems, the capture cross sections and the formation of the compound nucleus ²⁷⁰Hs are calculated and compared. In the entrance channel, the projectile is captured after overcoming the Coulomb barrier that has a distribution due to the deformation of the target nucleus. After contact, the system is assumed to be injected into an "asymmetric fission valley'' by the neutron induced neck formation. The dynamic process of the composite nucleus in the "asymmetric fission valley'' is treated in a two-parameter Smoluchowski equation in which neutron flow and diffusion in elongation coordinates are taken into account. The compound nucleus configuration is achieved only for those events where the system has diffused over the conditional saddle-point in the "asymmetric fission valley''. Our results show that the Coulomb barrier in the entrance channel and the height of the conditional saddle-point in the "asymmetric fission valley'' have obvious influence in the processes of the capture and compound nucleus formation.

References

[1]

. LIU Zu-Hua, BAO Jing-Dong. Chin. Phys. Lett., 2005, 22:30442. Swiatecki W J, Siwek-Wilezynska K, Wilezynski J. Phys.Rev., 2005, C71: 0146023. Adamian G G, Antonenko N V, Scheid W. Nucl. Phys.,1998, A633: 4094. Vandenbosch R, Huizenga J R. Nuclear Fission. New York:Academic Press, 1973, 2335. LI Wen-Fei et al. Chin. Phys. Lett., 2004, 21: 6366. Siwek-Wilczynska K, Skwira I. Phys. Rev., 2005, C72:0346057. Adamian G G, Antonenko N V, ScheidWet al. Nucl. Phys.,1998, A633: 4098. Adamian G G, Antonenko N V, Scheid W. Nucl. Phys.,2000, A678: 249. Adamian G G, Antonenko N V, Ivanova S P et al. Phys.Rev., 2000, C62: 064303; Zubov A S et al. ibid. 2002, 65:024308

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LIU Zu-Hua and BAO Jing-Dong. Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus ²⁶⁶Hs[J]. Chinese Physics C, 2006, 30(12): 1175-1179.

LIU Zu-Hua and BAO Jing-Dong. Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus ²⁶⁶Hs[J]. Chinese Physics C, 2006, 30(12): 1175-1179. shu

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Received: 2006-03-02
Revised: 2006-04-13

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus²⁶⁶Hs

LIU Zu-Hua^,
BAO Jing-Dong

Corresponding author:LIU Zu-Hua,

China Institute of Atomic Energy, Beijing 102413, China2 Department of Physics, Beijing Normal University, Beijing 100875, China

Received Date:2006-03-02
Accepted Date:2006-04-13
Available Online:2006-12-05

Abstract:For the²⁶Mg+²⁴⁴Cm,²⁷Al+²⁴³Am and³²S+²³⁸U systems, the capture cross sections and the formation of the compound nucleus²⁷⁰Hs are calculated and compared. In the entrance channel, the projectile is captured after overcoming the Coulomb barrier that has a distribution due to the deformation of the target nucleus. After contact, the system is assumed to be injected into an "asymmetric fission valley'' by the neutron induced neck formation. The dynamic process of the composite nucleus in the "asymmetric fission valley'' is treated in a two-parameter Smoluchowski equation in which neutron flow and diffusion in elongation coordinates are taken into account. The compound nucleus configuration is achieved only for those events where the system has diffused over the conditional saddle-point in the "asymmetric fission valley''. Our results show that the Coulomb barrier in the entrance channel and the height of the conditional saddle-point in the "asymmetric fission valley'' have obvious influence in the processes of the capture and compound nucleus formation.