Effects of nuclear orientation on fusion and fission process in heavy ion reactions

Journal Article · Mon May 04 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3141660· OSTI ID:21304788

Nishio, K; Ikezoe, H; Mitsuoka, S; Nishinaka, I; Nagame, Y ^[1]; Watanabe, Y ^[2]; Ohtsuki, T; Hirose, K ^[3]; Hofmann, S ^[4]

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1. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
2. High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan)
3. Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826 (Japan)
4. Gesellschaft fuer Schwerionenforschung mbH, D-64220 Darmstadt (Germany)

Effects of nuclear orientation on fission fragment mass distributions in the reaction of {sup 30}Si+{sup 238}U were investigated. The mass distributions showed a Gaussian shape in the above barrier region, having a character of fusion-fission. At the sub-barrier energies, the asymmetric fission component around A{sub L}/A{sub H}{approx_equal}90/178 appears, representing quasifision. The measured evaporation residue cross sections for {sup 30}Si+{sup 238}U in [1] have also suggested the competition between fusion and quasifission at sub-barrier region, whereas the fusion is the main process in the above barrier region. These results suggest an influence of orientation effects of the deformed target nuclei on the reaction. Discussion will be given on the difference in the mass distributions between {sup 30}Si+{sup 238}U and {sup 36}S+{sup 238}U.

• OSTI ID: 21304788
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1120; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
CROSS SECTIONS
EVAPORATION MODEL
FISSION
FISSION FRAGMENTS
MASS DISTRIBUTION
ORIENTED NUCLEI
QUASI-FISSION
SILICON 30 REACTIONS
SULFUR 36 REACTIONS
TANDEM ELECTROSTATIC ACCELERATORS
TRANSACTINIDE ELEMENTS
URANIUM 238 TARGET