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Report No.

Evidence for hindrance in fusion between sulfur and lead nuclei

Khuyagbaatar, J.*; Nishio, Katsuhisa  ; Hofmann, S.*; Ackermann, D.*; Block, M.*; Heinz, S.*; He${ss}$berger, F. P.*; Hirose, Kentaro ; Ikezoe, Hiroshi; Kindler, B.*; Lommel, B.*; Makii, Hiroyuki  ; Mitsuoka, Shinichi; Nishinaka, Ichiro; Otsuki, Tsutomu*; Wakabayashi, Yasuo*; Yan, S.*

The influence of the structure of projectile and target nuclei on the capture cross-sections was investigated for the reactions $$^{34}$$S+$$^{204,206,208}$$Pb and $$^{36}$$S+$$^{204,206,208}$$Pb. Capture cross-sections were deduced by measuring the fission fragments using multi-wire proportional counters. An enhancement of the capture cross-sections relative to an one-dimensional barrier penetration model was observed for all reactions at energies below the interaction barriers. The enhancement is larger in the case of reactions with $$^{34}$$S than with $$^{36}$$S. This observation is explained by a stronger coupling to the vibrational states in the reactions with $$^{34}$$S. Comparing the capture cross-sections and the evaporation-residue cross-sections for the reactions $$^{36}$$S+$$^{206}$$Pb and $$^{34}$$S+$$^{208}$$Pb, both yielding the same compound nucleus $$^{242}$$Cf, it is shown that the latter reaction has a lower fusion probability.



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Category:Physics, Nuclear



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