Measurement of the 235U(n,f) cross section relative to the 6Li(n,t) and 10B(n,alpha) standards from thermal to 170 keV neutron energy range at n_TOF
Creators: name: Amaducci, S.
name: Cosentino, L.
name: Barbagallo, M.
name: Colonna, N.
name: Mengoni, A.
name: Massimi, C.
name: Meo, S. Lo
name: Finocchiaro, P.
name: Aberle, O.
name: Andrzejewski, J.
name: Audouin, L.
name: Bacak, M.
name: Balibrea, J.
name: Bečvář, F.
name: Berthoumieux, E.
name: Billowes, J.
name: Bosnar, D.
name: Brown, A.
name: Caamaño, M.
name: Calviño, F.
name: Calviani, M.
name: Cano-Ott, D.
name: Cardella, R.
name: Casanovas, A.
name: Cerutti, F.
name: Chen, Y. H.
name: Chiaveri, E.
name: Cortés, G.
name: Cortés-Giraldo, M. A.
name: Damone, L. A.
name: Diakaki, M.
name: Domingo-Pardo, C.
name: Dressler, R.
name: Dupont, E.
name: Durán, I.
name: Fernández-Domínguez, B.
name: Ferrari, A.
name: Ferreira, P.
name: Furman, V.
name: Göbel, K.
name: García, A. R.
name: Gawlik, A.
name: Gilardoni, S.
name: Glodariu, T.
name: Gonçalves, I. F.
name: González-Romero, E.
name: Griesmayer, E.
name: Guerrero, C.
name: Gunsing, F.
name: Harada, H.
name: Heinitz, S.
name: Heyse, J.
name: Jenkins, D. G.
name: Jericha, E.
name: Käppeler, F.
name: Kadi, Y.
name: Kalamara, A.
name: Kavrigin, P.
name: Kimura, A.
name: Kivel, N.
name: Knapova, I.
name: Kokkoris, M.
name: Krtička, M.
name: Kurtulgil, D.
name: Leal-Cidoncha, E.
name: Lederer, C.
name: Leeb, H.
name: Lerendegui-Marco, J.
name: Lonsdale, S. J.
name: Macina, D.
name: Manna, A.
name: Marganiec, J.
name: Martínez, T.
name: Masi, A.
name: Mastinu, P.
name: Mastromarco, M.
name: Maugeri, E. A.
name: Mazzone, A.
name: Mendoza, E.
name: Milazzo, P. M.
name: Mingrone, F.
name: Musumarra, A.
name: Negret, A.
name: Nolte, R.
name: Oprea, A.
name: Patronis, N.
name: Pavlik, A.
name: Perkowski, J.
name: Porras, I.
name: Praena, J.
name: Quesada, J. M.
name: Radeck, D.
name: Rauscher, T.
name: Reifarth, R.
name: Rubbia, C.
name: Ryan, J. A.
name: Sabaté-Gilarte, M.
name: Saxena, A.
name: Schillebeeckx, P.
name: Schumann, D.
name: Sedyshev, P.
name: Smith, A. G.
name: Sosnin, N. V.
name: Stamatopoulos, A.
name: Tagliente, G.
name: Tain, J. L.
name: Tarifeño-Saldivia, A.
name: Tassan-Got, L.
name: Valenta, S.
name: Vannini, G.
name: Variale, V.
name: Vaz, P.
name: Ventura, A.
name: Vlachoudis, V.
name: Vlastou, R.
name: Wallner, A.
name: Warren, S.
name: Weiss, C.
name: Woods, P. J.
name: Wright, T.
name: Žugec, P.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The 235U(n,f) cross section was measured in a wide energy range at n_TOF relative to 6Li(n,t) and 10B(n,alpha), with high resolution and in a wide energy range, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the reaction yields under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10÷30 keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the evaluated cross section in the 9÷18 keV neutron energy range is indeed overestimated, both in the recent updates of ENDF/B-VIII.0 and of the IAEA reference data. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The new, high accuracy results here reported may lead to a reduction of the uncertainty in the 1÷100 keV neutron energy region. Finally, the present data provide additional confidence on the recently re-evaluated cross section integral between 7.8 and 11 eV.
description: 22 pages, 20 figures, submitted to PRC