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Report No.

High-resolution study of $$^{237}$$Np fission cross section from 5 eV to 1 MeV

Furman, W.*; Cennini, P.*; Ketlerov, V.*; Goverdovski, A.*; Konovalov, V.*; Abbondanno, U.*; Aerts, G.*; $'A$lvarez, H.*; Alvarez-Velarde, F.*; Andriamonje, S.*; Andrzejewski, J.*; Assimakopoulos, P.*; Audouin, L.*; Badurek, G.*; Baumann, P.*; Becv$'a$r, F.*; Benlliure, J.*; Berthoumieux, E.*; Calvi$~n$o, F.*; Cano-Ott, D.*; Capote, R.*; Carrillo de Albornoz, A.*; Chepel, V.*; Chiaveri, E.*; Colonna, N.*; Cortes, G.*; Cortina, D.*; Couture, A.*; Cox, J.*; David, S.*; Dolfini, R.*; Domingo-Pardo, C.*; Dorochenko, A.*; Dridi, W.*; Dur$'a$n, I.*; Embid-Segura, M.*; Ferrant, L.*; Ferrari, A.*; Ferreira-Marques, R.*; Fitzpatrick, L.*; Frais-Koelbl, H.*; Fujii, Kaori*; Guerrero, C.*; Goncalves, I.*; Gallino, R.*; Gonzalez-Romero, E.*; Gramegna, F.*; Griesmayer, E.*; Gunsing, F.*; Haas, B.*; Haight, R.*; Heil, M.*; Herrera-Martinez, A.*; Igashira, Masayuki*; Isaev, S.*; Jericha, E.*; Kadi, Y.*; K$"a$ppeler, F.*; Karamanis, D.*; Karadimos, D.*; Kerveno, M.*; Koehler, P.*; Kolokolov, D.*; Kossionides, E.*; Krti$v{c}$ka, M.*; Lamboudis, C.*; Leeb, H.*; Lindote, A.*; Lopes, I.*; Lozano, M.*; Lukic, S.*; Marganiec, J.*; Marques, L.*; Marrone, S.*; Mastinu, P.*; Mengoni, A.*; Milazzo, P. M.*; Moreau, C.*; Mosconi, M.*; Neves, F.*; Oberhummer, H.*; O'Brien, S.*; Oshima, Masumi; Pancin, J.*; Papachristodoulou, C.*; Papadopoulos, C.*; Paradela, C.*; Patronis, N.*; Pavlik, A.*; Pavlopoulos, P.*; Perrot, L.*; Plag, R.*; Plompen, A.*; Plukis, A.*; Poch, A.*; Pretel, C.*; Quesada, J.*; Rauscher, T.*; Reifarth, R.*; Rosetti, M.*; Rubbia, C.*; Rudolf, G.*; Rullhusen, P.*; Salgado, J.*; Sarchiapone, L.*; Sedysheva, M.*; Stephan, C.*; Tagliente, G.*; Tain, J. L.*; Tassan-Got, L.*; Tavora, L.*; Terlizzi, R.*; Vannini, G.*; Vaz, P.*; Ventura, A.*; Villamarin, D.*; Vincente, M. C.*; Vlachoudis, V.*; Vlastou, R.*; Voss, F.*; Wendler, H.*; Wiescher, M.*; Wisshak, K.*

A series of measurements of $$^{237}$$Np fission cross section have been performed at the CERN spallation neutron source facility n_TOF. A fast ionization chamber was used as a fission fragment detector. Total experimental uncertainties are determined to be at the level of 3%. Analysis of experimental data in the neutron energy from 5 eV to 1 MeV showed a systematic deviation from the evaluated data (ENDF/B-VI). This discrepancy amounts to up to the factor of 3 for resolved resonances in the neutron energy range of 5 eV - 2 keV, and is in good agreement with some previous experiments. A similar disagreement at the level of 6-7% was found for higher energies around the threshold. This energy range is essential for the transmutation of neptunium in ADS or fast reactors. It is concluded that an updated evaluation of nuclear data for $$^{237}$$Np is required.



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