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

        Author
        Furman, W.
        Cennini, P.
        Ketlerov, V.
        Goverdovski, A.
        Konovalov, V.
        Abbondanno, U.
        Aerts, G.
        Alvarez, H.
        Alvarez-Velarde, F.
        Andriamonje, S.
        Andrzejewski, J.
        Assimakopoulos, P.
        Audouin, L.
        Badurek, G.
        Baumann, P.
        Becvar, F.
        Benlliure, J.
        Berthoumieux, E.
        Calvino, F.
        Cano-Ott, D.
        Capote, R.
        de Albornoz, A.C.
        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.
        Duran, R.B.
        Embid-Segura, M.
        Ferrant, L.
        Ferrari, A.
        Ferreira-Marques, R.
        Fitzpatrick, L.
        Frais-Koelbl, H.
        Fujii, K.
        Guerrero, C.
        Goncalves, I. F.
        Gallino, R.
        Gonzalez-Romero, E.
        Gramegna, F.
        Griesmayer, E.
        Gunsing, F.
        Haas, B.
        Haight, R.
        Heil, M.
        Herrera-Martinez, A.
        Igashira, M.
        Isaev, S.
        Jericha, E.
        Kadi, Y.
        Kappeler, F.
        Karamanis, D.
        Karadimos, D.
        Kerveno, M.
        Koehler, P.
        Kolokolov, D.
        Kossionides, E.
        Krticka, 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, M.
        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.
        Attention
        2299/14218
        Abstract
        A series of measurements of Np-237 fission cross section have been performed at the CERN spallation neutron facility n_TOF which covers a wide energy range from 1 eV up to 250 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with registration efficiency of not less than 97%. Particular attention was paid to correct the fission cross section with use of U-235 standard. Total experimental uncertainties are determined to be at the level of 3%. Analysis of the experimental data in the restricted neutron energy from 5 eV up to I MeV showed a systematic deviation from evaluated data (ENDF/B-VI). This discrepancy amounts to up to a factor 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 (E-n = 300 keV-1 MeV). 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. Np-237 is required.
        Publication date
        2005
        Published in
        Int Conf on Nuclear Data for Science and Technology
        Published version
        https://doi.org/10.1063/1.1945184
        Other links
        http://hdl.handle.net/2299/14218
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