[Zurück]

D. Tarrio, G. Badurek, E. Jericha, H. Leeb, H. Oberhummer, M. Pigni, -. nTOF Collaboration:
"High-energy Neutron-induced Fission Cross Sections of Natural Lead and Bismuth-209";
Journal of the Korean Physical Society, 59 (2011), S. 1904 - 1907.

The CERN Neutron Time-Of- Flight (n_TOF) facility is well suited to measure small neutron-induced fission cross sections, as those of subactinides. The cross section ratios of ^natPb and ²⁰⁹Bi relative to ²³⁵U and ²³⁸U were measured using PPAC detectors. The fragment coincidence method allows to unambiguously identify the fission events. The present experiment provides the first results for neutron-induced fission up to 1 GeV for ^natPb and ²⁰⁹Bi. A good agreement with previous experimental data below 200 MeV is shown. Thecomparison with proton-induced fission indicates that the limiting regime where neutron-induced and proton-induced fission reach equal cross section is close to 1 GeV.

Nuclear data, Neutron-induced fi ssion reactions, Pb-nat(n,f), Bi-209(n,f), Spallation neutron source, n_TOF facility

http://dx.doi.org/10.3938/jkps.59.1904