Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 37: Nuclear Structure/Spectroscopy VI
HK 37.7: Vortrag
Donnerstag, 11. März 2004, 15:30–15:45, A
PREDICTION OF FISSION MASS-YIELD DISTRIBUTIONS BASED ON CROSS-SECTION CALCULATIONS — •S. Oberstedt1, F.-J. Hambsch1, G. Vladuca2, A. Tudora2, and D. Filipescu2 — 1EC-JRC IRMM, Retieseweg, B-2440 Geel — 2Bucharest University, Faculty of Physics, RO-76900 Bucharest
The statistical model for fission cross-section evaluation is extended by the concept of multi-modality of the fission process. The three most dominant fission modes, the two asymmetric standard I (S1) and standard II (S2) modes and the symmetric superlong (SL) mode are taken into account. De-convoluted fission cross-sections for S1, S2 and SL modes for 235,238U(n, f) and 237Np(n, f), based on experimentally obtained branching ratios, were calculated for the first time in the incident neutron-energy range from 0.01 to 5.5 MeV. Good agreement was found with the experimental neutron-induced reaction cross-section data from competitive reaction channels as well. Fission-mode branching ratios were obtained over the whole incident neutron-energy range. The possibility to predict fission-fragment yield and energy distributions at neutron energies, where no experimental data exist, is demonstrated.