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- Title
Measurement of evaporation residue cross-sections of the reaction <sup>30</sup>Si + <sup>238</sup>U at subbarrier energies.
- Authors
Nishio, K.; Hofmann, S.; Heßberger, F.; Ackermann, D.; Antalic, S.; Comas, V.; Gan, Z.; Heinz, S.; Heredia, J.; Ikezoe, H.; Khuyagbaatar, J.; Kindler, B.; Kojouharov, I.; Kuusiniemi, P.; Lommel, B.; Mann, R.; Mazzocco, M.; Mitsuoka, S.; Nagame, Y.; Ohtsuki, T.
- Abstract
The reaction 30Si + 238U → 268Sg* was studied at beam energies close to the Coulomb barrier. At a center-of-mass energy of E c.m. = 144.0MeV for reactions at half thickness of the target we measured three decay chains of 263Sg produced by evaporation of five neutrons. The cross-section was ( 67+67-37) pb. At E c.m. = 133.0MeV we measured three spontaneously fissioning nuclei which we assigned to the isotope 264Sg. The production cross-section was ( 10+10-6) pb and a half-life of ( 120+126-44) ms was determined. This half-life is a factor of twenty shorter than theoretical predictions. At E c.m. = 128.0MeV an upper cross-section limit of 15pb was measured. The cross-section data reveal a strong influence of the orientation of the deformed target nucleus on the production yield. Compared to excitation functions measured for the lighter system 16O + 238U → 254Fm*, a reduction of the fusion probability was observed at low beam energies indicating increasing competition from quasifission processes.
- Subjects
EVAPORATION (Chemistry); NEUTRONS; NUCLEAR fission; COULOMB excitation; PARTICLES (Nuclear physics)
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2006, Vol 29, Issue 3, p281
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2006-10091-y