Title: 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
Authors: AMADUCCI S.COSENTINO LUIGIBARBAGALLO M.COLONNA N.MENGONI A.MASSIMI C.LO MEO S.FINOCCHIARO PAOLOABERLE O.ANDRZEJEWSKI J.AUDOUIN L.BACAK M.BALIBREA J.BECVÁR F.BERTHOUMIEUX E.BILLOWES J.BOSNAR D.BROWN A.CAAMANO M.CALVIÑO F.CALVIANI M.CANO-OTT D.CARDELLA R.CASANOVAS A.CERUTTI F.CHEN Y. H.CHIAVERI E.CORTES G.CORTES-GIRALDO M. A.DAMONE L.DIAKAKI M.DOMINGO-PARDO C.DRESSLER R.DUPONT E.DURAN I.FERNANDEZ-DOMINGUEZ B.FERRARI A.FERREIRA P.FURMAN V.GÖBEL K.GARCIA A. R.GAWLIK A.GILARDONI S.GLODARIU T.GONCALVES I.GONZALEZ-ROMERO E.GRIESMAYER E.GUERRERO CGUNSING F.HARADA H.HEINITZ S.HEYSE JANJENKINS D. G.JERICHA E.KAEPPELER F.KADI Y.KALAMARA A.KAVRIGIN P.KIMURA A.KIVEL NIKOKNAPOVA I.KOKKORIS M.KRTIČKA M.KURTULGIL D.LEAL-CIDONCHA E.LEDERER-WOODS CLAUDIALEEB H.LERENDEGUI-MARCO J.LONSDALE S.MACINA D.MANNA A.MARGANIEC J.MARTÍNEZ T.MASI A.MASTINU P.MASTROMARCO M.MAUGERI E.MAZZONE A.MENDOZA E.MILAZZO P. M.MINGRONE F.MUSUMARRA A.NEGRET A.NOLTE R.OPREA A.PATRONIS N.PAVLIK ANDREASPERKOWSKI J.PORRAS I.PRAENA J.QUESADA J.RADECK D.RAUSCHER T.REIFARTH R.RUBBIA C.RYAN J.SABATE-GILARTE MSAXENA A.SCHILLEBEECKX PETERSCHUMANN D.SEDYSHEV P.SMITH A. G.SOSNIN N. V.STAMATOPOULOS A.TAGLIENTE G.TAIN J. L.TARIFENO-SALDIVIA A.TASSAN-GOT L.VALENTA S.VANNINI G.VARIALE V.VAZ P.VENTURA A.VLACHOUDIS V.VLASTOU R.WALLNER A.WARREN S.WEISS C.WOODS P. J.WRIGHT T. J.ZUGEC P.
Citation: EUROPEAN PHYSICAL JOURNAL A vol. 55 p. 120 (19 pp)
Publisher: SPRINGER
Publication Year: 2019
JRC N°: JRC115961
ISSN: 1434-6001 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC115961
DOI: 10.1140/epja/i2019-12802-7
Type: Articles in periodicals and books
Abstract: The 235U(n,f) cross section was measured in a wide energy range at n_TOF relative to 6Li(n,t) and 10B(n,α), 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.
JRC Directorate:Nuclear Safety and Security

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