Details

Autor(en) / Beteiligte

• Amaducci, S.
• Barbagallo, M.
• Mengoni, A.
• Massimi, C.
• Lo Meo, S.
• Finocchiaro, P.
• Andrzejewski, J.
• Audouin, L.
• Bacak, M.
• Balibrea, J.
• Bečvář, F.
• Billowes, J.
• Bosnar, D.
• Brown, A.
• Calviño, F.
• Calviani, M.
• Cano-Ott, D.
• Cardella, R.
• Casanovas, A.
• Chen, Y. H.
• Cortés, G.
• Cortés-Giraldo, M. A.
• Damone, L. A.
• Diakaki, M.
• Dressler, R.
• Dupont, E.
• Durán, I.
• Fernández-Domínguez, B.
• Ferrari, A.
• Ferreira, P.
• Furman, V.
• Gawlik, A.
• Gilardoni, S.
• Glodariu, T.
• Gonçalves, I. F.
• González-Romero, E.
• Guerrero, C.
• Gunsing, F.
• Harada, H.
• Heinitz, S.
• Heyse, J.
• Jenkins, D. G.
• Jericha, E.
• Käppeler, F.
• Kalamara, A.
• Kavrigin, P.
• Kimura, A.
• Kivel, N.
• Kokkoris, M.
• Krtička, M.
• Kurtulgil, D.
• Leal-Cidoncha, E.
• Leeb, H.
• Lerendegui-Marco, J.
• Macina, D.
• Manna, A.
• Marganiec, J.
• Martínez, T.
• Masi, A.
• Mastinu, P.
• Mastromarco, M.
• Mazzone, A.
• Mendoza, E.
• Milazzo, P. M.
• Mingrone, F.
• Musumarra, A.
• Negret, A.
• Nolte, R.
• Oprea, A.
• Patronis, N.
• Pavlik, A.
• Perkowski, J.
• Porras, I.
• Praena, J.
• Quesada, J. M.
• Radeck, D.
• Rauscher, T.
• Reifarth, R.
• Rubbia, C.
• Ryan, J. A.
• Sabaté-Gilarte, M.
• Saxena, A.
• Schillebeeckx, P.
• Sedyshev, P.
• Smith, A. G.
• Sosnin, N. V.
• Stamatopoulos, A.
• Tagliente, G.
• Tain, J. L.
• Tarifeño-Saldivia, A.
• Tassan-Got, L.
• Valenta, S.
• Variale, V.
• Ventura, A.
• Vlachoudis, V.
• Wallner, A.
• Warren, S.
• Weiss, C.
• Woods, P. J.
• Wright, T.

Titel

Measurement of the 235U(n, f) cross section relative to the 6Li(n, t) and 10B(n,α) standards from thermal to 170 keV neutron energy range at n_TOF

Ist Teil von

• The European physical journal. A, Hadrons and nuclei, 2019, Vol.55 (7), p.1-19, Article 120

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• . The 235 U(n, f ) cross section was measured at n_TOF relative to 6 Li(n, t) and 10 B(n, α ) , with high resolution ( L = 183 . 49 ( 2 ) m) and in a wide energy range (25meV-170keV) with 1.5% systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the yields of the 235 U(n, f ) and of the two reference reactions under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10-30keV 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 cross section in the 9-18keV neutron energy range is indeed overestimated by almost 5% in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3, as a consequence of a 7% overestimate in a single GMA node in the IAEA reference file. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The results here reported may lead to a reduction of the uncertainty in the 1-100keV neutron energy region. Finally, from the present data, a value of 249 . 7 ± 1 . 4 ( stat ) ± 0 . 94 ( syst ) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247 . 5 ± 3 b·eV recently established as a standard.