High accuracy determination of the 238U/235 U fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN

The 238U to 23577 U fission cross section ratio has been determined at n_TOF up to 1 GeV, with two different detection systems, in different geometrical configurations. A total of four data sets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solving a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to 1 GeV.

PARADELA DOBARRO Carlos;  CALVIANI M.;  TARRIO D.;  LEAL-CIDONCHA E.;  LEONG L. S.;  TASSAN-GOT L.;  LE NAOUR C.;  DURAN I.;  COLONNA N.;  AUDOUIN L.;  MASTROMARCO M.;  LO MEO S.;  VENTURA A.;  ALTSTADT S.;  ANDRZEJEWSKI J.;  BARBAGALLO M.;  BECARES V.;  BECVÁR F.;  BELLONI F.;  BERTHOUMIEUX E.;  BILLOWES J.;  BOCCONE V.;  BOSNAR D.;  BRUGGER M.;  CALVIÑO F.;  CANO-OTT D.;  CARRAPIÇO C.;  CERUTTI F.;  CHIAVERI E.;  CHIN M.;  CORTES G.;  CORTES-GIRALDO M. A.;  DIAKAKI M.;  DOMINGO-PARDO C.;  DRESSLER R.;  ELEFTHERIADIS C.;  FERRARI A.;  FRAVAL K.;  GANESAN S.;  GARCIA A. R.;  GIUBRONE G.;  GOMEZ-HORNILLOS M. B.;  GONZALEZ-ROMERO E.;  GONÇALVES I.;  GRIESMAYER E.;  GUERRERO C.;  GUNSING F.;  GURUSAMY P.;  JENKINS D. G.;  JERICHA E.;  KADI Y.;  KARADIMOS D.;  KÄPPELER F.;  KOKKORIS M.;  KIVEL Niko;  KROLL J.;  KRTICKA M.;  LANGER C.;  LEEB H.;  LOSITO R.;  MANOUSOS A;  MARGANIEC J.;  MARTÍNEZ T.;  MASSIMI C.;  MASTINU P.;  MENDOZA E.;  MENGONI A.;  MILAZZO P. M.;  MINGRONE F.;  MIREA M.;  MONDELAERS Willy;  PAVLIK Andreas;  PERKOWSKI J.;  PLOMPEN Arjan;  PRAENA J.;  QUESADA J.;  RAUSCHER T.;  REIFARTH R.;  RIEGO A.;  ROMAN F.;  RUBBIA C.;  SARMENTO R.;  SCHILLEBEECKX Peter;  SCHMIDT S.;  SCHUMANN D.;  TAGLIENTE G.;  TAIN J. L.;  TSINGANIS A.;  VALENTA S.;  VANNINI G.;  VARIALE V.;  VAZ P.;  VERMEULEN M.;  VERSACI R.;  VLACHOUDIS V.;  VLASTOU R.;  WALLNER A.;  WARE T.;  WEIGAND M.;  WEISS C.;  WRIGHT T. J.;  ZUGEC P.;  BERTHIER B.;  FERRANT L.;  ALVAREZ H.;  ALVAREZ-VELARDE F.;  ANDRIAMONJE S.;  BADUREK G.;  BAUMANN P.;  CAPOTE R.;  CENNINI P.;  COUTURE A.;  COX J.;  DAVID S.;  DILLMANN I.;  DRIDI W.;  EMBID-SEGURA M.;  FUJII K.;  FURMAN W.;  GRAMEGNA F.;  HAIGHT R.;  HEIL M.;  IGASHIRA M.;  KERVENO M.;  LOZANO M.;  MARRONE S.;  MOREAU C.;  MOSCONI M.;  O'BRIEN S.;  PERROT L.;  PLAG R.;  PLUKIS A.;  PRETEL C.;  RUDOLF G.;  SALGADO J.;  SANTOS C.;  SARCHIAPONE L.;  TAVORA L.;  TERLIZZI R.;  VILLAMARIN D.;  VINCENTE M. C.;  WALTER S.;  WIESCHER M.;  WISSHAK K.;  AERTS G.;  PAVLOPOULOS P.;  COSENTINO Luigi;  FINOCCHIARO Paolo;  GOVERDOVSKI A.;  HEINITZ S.;  ISAEV S.;  KARAMANIS D.;  KETLEROV V.;  KONOVALOV V.;  LAMPOUDIS C.;  LEDERER C.;  MUSUMARRA A.;  PANCIN J.;  PATRONIS N.;  PIGNI M. T.;  POCH A.;  RULLHUSEN Peter;  SAXENA A.;  STEPHAN C.;  VOSS F.; 

2015-02-17

AMER PHYSICAL SOC

JRC94723

0556-2813,   

http://journals.aps.org/prc/abstract/10.1103/PhysRevC.91.024602,    https://publications.jrc.ec.europa.eu/repository/handle/JRC94723,   

10.1103/PhysRevC.91.024602,