Decay Mechanism of Nuclear Fragments from Hot Nuclei Exceeding the Rotating Liquid Drop Limit (低および中高エネルギ-重イオン核反応機構)

概要

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In order to investigate the reaction mechanisms of Intermediate Mass Pragments(IMF) as well as Fission Products(FP) from a highly excited compound nucleus, we have carried out the experiment using the RIKEN Ring Cyclotron for ^<84>Kr+^<27> Al at 10.6 MeV/u in which the complete fusion is still dominant. The distributions of nuclear element Z and its isotope mass are analyzed extensively in terms of Extended Hauser Feshbach Method(EHFM) and it is concluded that the sequential decay is playing an important role in accounting for those distributions and the fully equilibrated compound states of ^<111>In at 〜 200 MeV do exist with the angular momentum state of 83 ± 7h above the limit of rotating liquid drop model of 68h. A large difference observed in the previous experimental Z-distributions for ^<84>Kr+^<27>Al at 5.83 MeV/u and ^3He+Ag at 30 MeV/u, which form the nearly same compound nucleus In at 〜 100 MeV, is interpreted consistently in terms of EHFM as being due to the effect of angular momentum windows involved.
素粒子論グループ素粒子研究編集部の論文
1991-08-20