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Fission fragment mass distributions of Np, Pu and Am isotopes utilizing multi-nucleon transfer reactions

Vermeulen, M. J.; 西尾 勝久  ; 牧井 宏之  ; 廣瀬 健太郎 ; Orlandi, R. ; 塚田 和明 ; 千葉 敏*; Andreyev, A.*

Vermeulen, M. J.; Nishio, Katsuhisa; Makii, Hiroyuki; Hirose, Kentaro; Orlandi, R.; Tsukada, Kazuaki; Chiba, Satoshi*; Andreyev, A.*

FFMD are interpreted in terms of symmetric and asymmetric modes. The current work looks at the excitation energy dependence of the FFMD of various actinide nuclei, with the aim to provide more information regarding the distribution of waste products following the transmutation of actinide waste in accelerator driven systems (ADS)The JAEA-Tokai Tandem accelerator facility was utilized for the current work, supplying an 18O beam with an energy of 162 MeV. This beam impinged on a target of $$^{237}$$Np, leading to many excited compound nuclei (CN; $$^{237,238,239}$$Np, $$^{238,239,240}$$Pu, $$^{241,242,243}$$Am), via MNT reactions, which then undergo fission. CN and their excitation energies were identified by detecting ejectiles with a silicon $$Delta$$E-E telescope. Fission fragments were detected in coincidence with two multi-wire proportional counters (MWPCs), and FFs masses were determined by a kinematic consideration. Preliminary results show the transition from asymmetric fission to asymmetric fission as CN excitation energy increases. All the measured nuclei investigated in this experiment showed similar behavior as will be shown at the meeting.

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