High-accuracy determination of the neutron flux at n_TOF

Barbagallo, M.; Guerrero, C.; Tsinganis, A.; Tarrio, D.; Altstadt, S.; Andriamonje, S.; Andrzejewski, J.; Audouin, L.; Becares, V.; Becvar, F.; Belloni, F.; Berthoumieux, E.; Billowes, J.; Boccone, V.; Bosnar, D.; Brugger, M.; Calviani, M.; Calvino, F.; Cano-Ott, D.; Carrapico, C.; Cerutti, F.; Chiaveri, E.; Chin, M.; Colonna, N.; Cortes, G.; Cortes-Giraldo, M. A.; Diakaki, M.; Domingo-Pardo, C.; Duran, I.; Dressler, R.; Dzysiuk, N.; Eleftheriadis, C.; Ferrari, A.; Fraval, K.; Ganesan, S.; Garcia, A. R.; Giubrone, G.; Goebel, K.; Gomez-Hornillos, M. B.; Goncalves, I. F.; Gonzalez-Romero, E.; Griesmayer, E.; Gunsing, F.; Gurusamy, P.; Hernandez-Prieto, A.; Jenkins, D. G.; Jericha, E.; Kadi, Y.; Kaeppeler, F.; Karadimos, D.; Kivel, N.; Koehler, P.; Kokkoris, M.; Krticka, M.; Kroll, J.; Lampoudis, C.; Langer, C.; Leal-Cidoncha, E.; Lederer, C.; Leeb, H.; Leong, L. S.; Losito, R.; Manousos, A.; Marganiec, J.; Martinez, T.; Massimi, C.; Mastinu, P. F.; Mastromarco, M.; Meaze, M.; Mendoza, E.; Mengoni, A.; Milazzo, P. M.; Mingrone, F.; Mirea, M.; Mondalaers, W.; Papaevangelou, T.; Paradela, C.; Pavlik, A.; Perkowski, J.; Plompen, A.; Praena, J.; Quesada, J. M.; Rauscher, T.; Reifarth, R.; Riego, A.; Roman, F.; Rubbia, C.; Sabate-Gilarte, M.; Sarmento, R.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Schumann, D.; Steinegger, P.; Tagliente, G.; Tain, J. L.; Tassan-Got, L.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Versaci, R.; Vermeulen, M. J.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Ware, T.; Weigand, M.; Weiss, C.; Wright, T.; Zugec, P.

Author

Barbagallo, M.

Guerrero, C.

Tsinganis, A.

Tarrio, D.

Altstadt, S.

Andriamonje, S.

Andrzejewski, J.

Audouin, L.

Becares, V.

Becvar, F.

Belloni, F.

Berthoumieux, E.

Billowes, J.

Boccone, V.

Bosnar, D.

Brugger, M.

Calviani, M.

Calvino, F.

Cano-Ott, D.

Carrapico, C.

Cerutti, F.

Chiaveri, E.

Chin, M.

Colonna, N.

Cortes, G.

Cortes-Giraldo, M. A.

Diakaki, M.

Domingo-Pardo, C.

Duran, I.

Dressler, R.

Dzysiuk, N.

Eleftheriadis, C.

Ferrari, A.

Fraval, K.

Ganesan, S.

Garcia, A. R.

Giubrone, G.

Goebel, K.

Gomez-Hornillos, M. B.

Goncalves, I. F.

Gonzalez-Romero, E.

Griesmayer, E.

Gunsing, F.

Gurusamy, P.

Hernandez-Prieto, A.

Jenkins, D. G.

Jericha, E.

Kadi, Y.

Kaeppeler, F.

Karadimos, D.

Kivel, N.

Koehler, P.

Kokkoris, M.

Krticka, M.

Kroll, J.

Lampoudis, C.

Langer, C.

Leal-Cidoncha, E.

Lederer, C.

Leeb, H.

Leong, L. S.

Losito, R.

Manousos, A.

Marganiec, J.

Martinez, T.

Massimi, C.

Mastinu, P. F.

Mastromarco, M.

Meaze, M.

Mendoza, E.

Mengoni, A.

Milazzo, P. M.

Mingrone, F.

Mirea, M.

Mondalaers, W.

Papaevangelou, T.

Paradela, C.

Pavlik, A.

Perkowski, J.

Plompen, A.

Praena, J.

Quesada, J. M.

Rauscher, T.

Reifarth, R.

Riego, A.

Roman, F.

Rubbia, C.

Sabate-Gilarte, M.

Sarmento, R.

Saxena, A.

Schillebeeckx, P.

Schmidt, S.

Schumann, D.

Steinegger, P.

Tagliente, G.

Tain, J. L.

Tassan-Got, L.

Valenta, S.

Vannini, G.

Variale, V.

Vaz, P.

Ventura, A.

Versaci, R.

Vermeulen, M. J.

Vlachoudis, V.

Vlastou, R.

Wallner, A.

Ware, T.

Weigand, M.

Weiss, C.

Wright, T.

Zugec, P.

Abstract

The neutron flux of the n_TOF facility at CERN was measured, after installation of the new spallation target, with four different systems based on three neutron-converting reactions, which represent accepted cross sections standards in different energy regions. A careful comparison and combination of the different measurements allowed us to reach an unprecedented accuracy on the energy dependence of the neutron flux in the very wide range (thermal to 1 GeV) that characterizes the n_TOF neutron beam. This is a pre-requisite for the high accuracy of cross section measurements at n_TOF. An unexpected anomaly in the neutron-induced fission cross section of U-235 is observed in the energy region between 10 and 30keV, hinting at a possible overestimation of this important cross section, well above currently assigned uncertainties.