Anisotropy of fission fragments for the reaction {sup 16}O+{sup 208}Pb
Journal Article
·
· AIP Conference Proceedings
- Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141960 Dubna, Moscow region (Russian Federation)
- Instituto Nazionale di Fisica Nucleare, Laboratorio Nazionale del Sud, 95123 Catania (Italy)
The cross section and angular distributions of fission fragments have been measured for the compound nucleus {sup 224}Th produced in the reaction {sup 16}O+{sup 208}Pb at four energy values in the range from 5 to 15 MeV below the fusion barrier calculated in terms of the Bass model. The performed measurements allowed one for the first time to obtain data for the region of interaction of heavy ions with nuclei characterized by the cross section being by 8 orders of magnitude lower than the geometric cross section. It can be seen that at the energy of oxygen ions of up to E{sub lab}{<=}82 MeV, account should be taken of the contribution made by the lowest vibration states of interacting partners. The measured angular distributions of fission fragments are in agreement with the calculations performed within the framework of the standard statistic transition state model for the saddle point. The data do not support the hypothesis that deep-subbarrier reactions are characterized by fission fragments showing anomalously high anisotropy. However in the investigated energy range there is a plateau characterized by the relation W(180 deg.)/W(90 deg.)=1.2 in the angular anisotropy of fission fragments. This implies that the available angular packet of harmonics, which govern the production cross section of a compound nucleus, is approximately the same.
- OSTI ID:
- 21202244
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 447; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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