Neutron-induced fission cross section of Pb-nat and Bi-209 from threshold to 1 GeV : An improved parametrization

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

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

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.