Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus 266Hs

  • 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.
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  • [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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Entrance Channel Dependence of Production Cross Sections of Superheavy Nucleus 266Hs

    Corresponding author: LIU Zu-Hua,
  • China Institute of Atomic Energy, Beijing 102413, China2 Department of Physics, Beijing Normal University, Beijing 100875, China

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.

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