Measurements of high-energy neutron-induced fission of (nat)Pb and (209)Bi

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, H.; Alvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Badurek, G.; Baumann, P.; Becvar, F.; Berthoumieux, E.; Calvino, F.; Calviani, M.; Cano-Ott, D.; Capote, R.; Carrapico, C.; Cennini, P.; Chepel, V.; Chiaveri, E.; Colonna, N.; Cortes, G.; Couture, A.; Cox, J.; Dahlfors, M.; David, S.; Dillmann, I.; Domingo-Pardo, C.; Dridi, W.; Eleftheriadis, C.; Embid-Segura, M.; Ferrari, A.; Ferreira-Marques, R.; Fujii, K.; Furman, W.; Goncalves, I.; Gonzalez-Romero, E.; Gramegna, F.; Guerrero, C.; Rauscher, T.; n-TOF Collaboration

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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, H.

Alvarez-Velarde, F.

Andriamonje, S.

Andrzejewski, J.

Assimakopoulos, P.

Badurek, G.

Baumann, P.

Becvar, F.

Berthoumieux, E.

Calvino, F.

Calviani, M.

Cano-Ott, D.

Capote, R.

Carrapico, C.

Cennini, P.

Chepel, V.

Chiaveri, E.

Colonna, N.

Cortes, G.

Couture, A.

Cox, J.

Dahlfors, M.

David, S.

Dillmann, I.

Domingo-Pardo, C.

Dridi, W.

Eleftheriadis, C.

Embid-Segura, M.

Ferrari, A.

Ferreira-Marques, R.

Fujii, K.

Furman, W.

Goncalves, I.

Gonzalez-Romero, E.

Gramegna, F.

Guerrero, C.

Rauscher, T.

n-TOF Collaboration

Abstract

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