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Report No.

Effects of nuclear orientation on fusion and fission process for reactions using uranium target nuclei

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

Results on the measurements of (1) evaporation residue (ER) cross-sections for $$^{30}$$Si, $$^{34}$$S + $$^{238}$$U and of (2) fission fragment mass distributions for $$^{30}$$Si,$$^{34,36}$$S, $$^{40}$$Ar + $$^{238}$$U will be discussed. Measurement of ER cross-section was carried out at GSI by using the velocity filter SHIP. Measurement of fission fragment mass distributions was made by using the JAEA tandem accelerator. In the reaction $$^{30}$$Si + $$^{238}$$U, the ER cross-section for $$^{263}$$Sg(5n) suggested no fusion hindance at above-barrier energy, whereas the one for $$^{264}$$Sg(4n) suggested competition between fusion and quasi-fission at sub-barrier energy. This conclusion is consistent with the measured fragment mass distributions, where the asymmetric fission component associated with quasi-fission appears only at sub-barrier energies. In the reaction of $$^{34}$$S + $$^{238}$$U, the ER cross-sections for $$^{267}$$Hs(5n) and $$^{268}$$Hs(4n, new isotope) suggested fusion hindrance both for above- and sub-barrier energies. With the results of fission fragment mass distributions, it is found that quasi-fission has symmetric fission components when projectile mass is relatively large. We will also discuss the variation of the fragment mass distributions for $$^{30}$$Si,$$^{34,36}$$S, $$^{40}$$Ar + $$^{238}$$U.



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