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Orientation effects of deformed $$^{238}$$U target nuclei on the fusion probability for the heavy element synthesis

重元素合成における変形した$$^{238}$$U標的原子核の融合反応における効果

西尾 勝久  ; Hofmann, S.*; 池添 博; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Lommel, B.*; Mann, R.*; Mazzocco, M.*; 光岡 真一; 永目 諭一郎 ; 大槻 勤*; Popeko, A. G.*; Saro, S.*; Sch$"o$tt, H. J.*; Sulignano, B.*; Svirikhin, A.*; 塚田 和明 ; Yeremin, A. V.*

Nishio, Katsuhisa; Hofmann, S.*; Ikezoe, Hiroshi; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Lommel, B.*; Mann, R.*; Mazzocco, M.*; Mitsuoka, Shinichi; Nagame, Yuichiro; Otsuki, Tsutomu*; Popeko, A. G.*; Saro, S.*; Sch$"o$tt, H. J.*; Sulignano, B.*; Svirikhin, A.*; Tsukada, Kazuaki; Yeremin, A. V.*

The effects of the orientation of the deformed $$^{238}$$U target nuclei were investigated in the reaction of $$^{30}$$Si+$$^{238}$$U. The cross-sections of the system to overcome the Coulomb barrier were determined by measuring the fission cross-sections at JAEA-tandem accelerator, from which the Coulomb barrier height for the collision of $$^{30}$$Si to the polar side and the equatorial side of $$^{238}$$U were determined. The evaporation residue (ER) cross-sections were determined at the velocity filter SHIP of GSI. Significant enhancement of the cross-sections of $$^{264}$$Sg(4n) in the sub-barrier energy indicates the lowering of the Coulomb barrier at the Polar collisions. However, competition between fusion and quasifission was implied. The cross-sections for $$^{263}$$Sg(5n) measured at the above barrier energy indicated that there is no significant fusion hindrance at the equatorial collisions. In this contribution, the systematic behavior of the orientation effects of $$^{238}$$U is discussed by using additionally the data of $$^{16}$$O+$$^{238}$$U and $$^{48}$$Ca+$$^{238}$$U.

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