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Nuclear-charge polarization at scission in proton-induced fission of $$^{233}$$U

陽子誘起核分裂における切断点での核電荷分極

西中 一朗; 谷川 勝至*; 永目 諭一郎 ; 中原 弘道*

Nishinaka, Ichiro; Tanikawa, Masashi*; Nagame, Yuichiro; Nakahara, Hiromichi*

$$^{233}$$Uの11.5MeV陽子誘起核分裂における二次分裂片の最確核電荷を二重飛行時間法で測定した質量収率と放射化学的手法で測定し文献に報告された部分累積収率と独立収率から決定した。二次分裂片質量数について放出中性子数を補正し、切断点での一次分裂片の核電荷分極を求めた。その結果から、切断点での核電荷分極は、原子核のポテンシャルエネルギーによって決まり、分裂核の質量数,励起エネルギー、そして中性子-陽子数比にほとんど依存しないことを明らかにした。

The most probable charges of secondary fragments in the 11.5 MeV proton-induced fission of $$^{233}$$U were determined from the mass yields measured by the double time-of-flight method and the fractional cumulative and independent yields measured radiochemically and reported in literature. The nuclear-charge polarization of primary fragments at scission was obtained by correcting the secondary fragment mass for neutron evaporation. The results show that the nuclear-charge polarization is determined by the minimum potential energy of nuclei at scission and that it is nearly independent not only of mass and excitation energy but also of the neutron-to-proton ratio of the fissioning nucleus.

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パーセンタイル:72.3

分野:Physics, Nuclear

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