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Effects of nuclear orientation on fission fragment mass distributions in the reactions of $$^{34,36}$$S+$$^{238}$$U

$$^{34,36}$$S+$$^{238}$$U反応の核分裂片質量数分布における標的核の向きの効果

西尾 勝久  ; 池添 博; 光岡 真一; 西中 一朗; 渡辺 裕*; 永目 諭一郎; 大槻 勤*; 廣瀬 健太郎*; Hofmann, S.*

Nishio, Katsuhisa; Ikezoe, Hiroshi; Mitsuoka, Shinichi; Nishinaka, Ichiro; Watanabe, Yutaka*; Nagame, Yuichiro; Otsuki, Tsutomu*; Hirose, Kentaro*; Hofmann, S.*

Fragment mass distributions for fission after full momentum transfer were measured for the reaction $$^{36,34}$$S,+,$$^{238}$$U at bombarding energies around the Coulomb barrier. The experiment was carried out by using the sulfur beams supplied by the JAEA tandem accelerator. The experimental data revealed a transition from symmetry to asymmetry mass distributions when the beam energies were decreased from above-barrier to sub-barrier values. The main components of the asymmetric mass distribution are at $$A$$=200 and $$A=$$74. The asymmetric fission is attributed to quasifission of the reacting system at polar collisions, whereas the symmetric fission originates from the compound nucleus produced in equatorial collisions. The results suggest a strong influence of orientation effects of the deformed target nuclei on fusion.

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