Effects of nuclear orientation on fusion and fission process for reactions using actinide target nuclei

Journal Article · Fri Apr 30 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3431429· OSTI ID:21367181

Nishio, K; Ikezoe, H; Mitsuoka, S; Nishinaka, I; Makii, H; 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. GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany)

Fission fragment mass distributions in the reaction of {sup 30}Si+{sup 238}U were measured at the energies around the Coulomb barrier. At the above-barrier energies, the mass distribution showed Gaussian shape. At the sub-barrier energies, triple-humped distribution was observed, which consists of symmetric fission and asymmetric fission peaked at A{sub L}/A{sub H}approx =90/178. The asymmetric fission should be attributed to quasifission from the results of the measured evaporation residue (ER) cross-sections produced by {sup 30}Si+{sup 238}U. The cross-section for {sup 263}Sg at the above-barrier energy agree with the statistical model calculation which assumes that the measured fission cross-sections are equal to the fusion cross-sections, whereas the one for {sup 264}Sg measured at the sub-barrier energy is smaller than the calculation, indicating the presence for quasifission. We also report the results on the fragment mass distributions for {sup 36,34}S+{sup 238}U and {sup 40}Ar+{sup 238}U.

• OSTI ID: 21367181
• Journal Information: AIP Conference Proceedings, Vol. 1224, Issue 1; Conference: International symposium on exotic nuclei, Sochi (Russian Federation), 28 Sep - 2 Oct 2009; Other Information: DOI: 10.1063/1.3431429; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 40 REACTIONS
ASYMMETRY
COULOMB FIELD
CROSS SECTIONS
FISSION
FISSION FRAGMENTS
MASS DISTRIBUTION
ORIENTED NUCLEI
QUASI-FISSION
SEABORGIUM 263
SEABORGIUM 264
SILICON 30 REACTIONS
STATISTICAL MODELS
SULFUR 34 REACTIONS
SULFUR 36 REACTIONS
URANIUM 238 TARGET
ALPHA DECAY RADIOISOTOPES
DISTRIBUTION
ELECTRIC FIELDS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MILLISECONDS LIVING RADIOISOTOPES
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
RADIOISOTOPES
SEABORGIUM ISOTOPES
SPATIAL DISTRIBUTION
SPONTANEOUS FISSION RADIOISOTOPES
TARGETS