Effects of nuclear orientation on the mass distribution of fission fragments in the reaction of {sup 36}S+{sup 238}U

Journal Article · Sun Jun 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.064607· OSTI ID:21191959

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. Institute of Particle and Nuclear Studies, 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-64291 Darmstadt (Germany)

Fragment mass distributions for fission after full momentum transfer were measured for the reaction {sup 36}S+{sup 238}U at bombarding energies around the Coulomb barrier. The data revealed a transition from symmetry to asymmetry mass distributions when the beam energies were decreased from above-barrier to sub-barrier values. The main components of the asymmetric mass distribution are at A{sub H}{approx_equal}200 and A{sub L}{approx_equal}74. The asymmetric fission is attributed to quasifission of the reacting system at polar collisions, whereas the symmetric fission originates from the compound nucleus produced in equatorial collisions. The results suggest a strong influence of orientation effects of the deformed target nuclei on fusion.

• OSTI ID: 21191959
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BEAMS
COLLISIONS
COMPOUND NUCLEI
COULOMB FIELD
FISSION
FISSION FRAGMENTS
MASS DISTRIBUTION
MOMENTUM TRANSFER
ORIENTATION
QUASI-FISSION
SULFUR 36
SYMMETRY
URANIUM 238