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

Nishio, Katsuhisa   ; Hofmann, S.*; Ikezoe, Hiroshi; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; 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.*

Effects of the prolate deformation of $$^{238}$$U on the fusion probability was investigated in the reactions of $$^{16}$$O+$$^{238}$$U and $$^{30}$$Si+$$^{238}$$U. The experiment was carried out at the JAEA tandem accelerator and GSI of Darmstadt. For $$^{16}$$O+$$^{238}$$U, the evaporation residue cross-sections for fermium isotopes were measured down to deep sub-barrier. The results indicate that the projectile $$^{16}$$O fuses from every colliding angle to the symmetric axis of the $$^{238}$$U target nucleus. In the reacion of $$^{30}$$Si+$$^{238}$$U, fusion hindrance was implied in the deep sub-barrier energies, but no fusion hindrance was suggested at the above barrier energy where the collision on the equatorial side of $$^{238}$$U starts to contribute. The results suggest that the equatorial collisions has advantage to produce heavy elements in the reaction using heavier projectiles.

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