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Symmetric and asymmetric scission properties in the fission of pre-actinides through heavy actinides

プレーアクチノイドから重アクチノイド領域の核分裂における対称・非対称切断点の特性

永目 諭一郎 ; 西中 一朗; Zhao, Y. L.*; 中原 弘道*

Nagame, Yuichiro; Nishinaka, Ichiro; Zhao, Y. L.*; Nakahara, Hiromichi*

アクチノイドの核分裂における、対称・非対称質量分割に伴う、対称・非対称切断点の形状(核分裂片の変形度)-伸びた形状とコンパクトな形状-を系統的に考察したので報告する。それぞれの形状(変形度)は核分裂片の全運動エネルギー並びに核分裂片から放出される中性子数の値から見積もった。広範なアクチノイド領域のデータをもとに切断点形状の系統性を導き出した。これにより重アクチノイド領域で特異な現象として観測されているbimodal fissionは従来のtwo-mode fissionの一部として解釈できることを提案する。

Existence of two kinds of scission configurations associated with symmetric and asymmetric fission modes is pointed out in the fission of actinides: elongated and compact configurations. Each scission property is discussed in terms of shape elongation evaluated from fragment total kinetic energy (TKE). Fragment deformation at scission is also discussed based on neutron multiplicity measurements. From the systematic study of the scission properties in a wide range of actinides, the bimodal fission observed in the spontaneous fission (SF) of the heavy actinides would be interpreted as the result of the presence of the two fission paths; the ordinary asymmetric fission path is still exiting while the symmetric one is bifurcated by strongly shell-influenced effects.

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