Neutron-induced fission cross section of Pb-nat and Bi-209 from threshold to 1 GeV : An improved parametrization
Author
Tarrio, D.
Tassan-Got, L.
Audouin, L.
Berthier, B.
Duran, I.
Ferrant, L.
Isaev, S.
Le Naour, C.
Paradela, C.
Stephan, C.
Trubert, D.
Abbondanno, U.
Aerts, G.
Alvarez-Velarde, F.
Andriamonje, S.
Andrzejewski, J.
Assimakopoulos, P.
Badurek, G.
Baumann, P.
Becvar, F.
Belloni, F.
Berthoumieux, E.
Calvino, F.
Calviani, M.
Cano-Ott, D.
Capote, R.
Carrapico, C.
Carrillo de Albornoz, A.
Cennini, P.
Chepel, V.
Chiaveri, E.
Colonna, N.
Cortes, G.
Couture, A.
Cox, J.
Dahlfors, M.
David, S.
Dillmann, I.
Dolfini, R.
Domingo-Pardo, C.
Dridi, W.
Eleftheriadis, C.
Embid-Segura, M.
Ferrari, A.
Ferreira-Marques, R.
Fitzpatrick, L.
Frais-Koelbl, H.
Fujii, K.
Furman, W.
Rauscher, T.
N TOF Collaboration
Attention
2299/10521
Abstract
Neutron-induced fission cross sections for Pb-nat and Bi-209 were measured with a white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. The experiment, using neutrons from threshold up to 1 GeV, provides the first results for these nuclei above 200 MeV. The cross sections were measured relative to U-235 and U-238 in a dedicated fission chamber with parallel plate avalanche counter detectors. Results are compared with previous experimental data. Upgraded parametrizations of the cross sections are presented, from threshold energy up to 1 GeV. The proposed new sets of fitting parameters improve former results along the whole energy range.