Title: Anomalies in the Charge Yields of Fission Fragments from the 238U(n,f) Reaction
Authors: WILSON J. N.LEBOIS M.QI LIQIANGAMADOR CELDRAN PEDROBLEUEL D. L.BRIZ J. A.CARROLL R.CATFORD W.DE WITTE H.DOHERTY D.ELOIRDI RACHELGEORGIEV G.GOTTARDO A.GOASDUFF A.HADYNSKE-KLEK K.HAUSCHILD K.HESS M.INGEBERG V.KONSTANTINOPOULOS T.LJUNGVALL J.LOPEZ-MARTENS A.LORUSSO G.LOZEVA R.LUTTER R.MARINI P.MATEA I.MATERNA T.MATHIEU L.OBERSTEDT A.OBERSTEDT STEPHANPANEBIANCO S.PODOLYAK Z.PORTA A.REGAN P. H,REITER P.REZYNKINA K.ROSE S. J.SAHIN E.SEIDLITZ M.SEROT O.SHEARMAN R.SIEBECK B.SIEM S.SMITH A. G.TVETEN G. M.VERNEY D.WARR N.ZEISER F.ZIELINSKA M.
Citation: PHYSICAL REVIEW LETTERS vol. 118 no. 22 p. 222501
Publisher: AMER PHYSICAL SOC
Publication Year: 2017
JRC N°: JRC105932
ISSN: 0031-9007
URI: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.222501
http://publications.jrc.ec.europa.eu/repository/handle/JRC105932
DOI: 10.1103/PhysRevLett.118.222501
Type: Articles in periodicals and books
Abstract: Fast-neutron-induced fission of 238U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency γ-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via γ−γ coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fast-neutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.
JRC Directorate:Nuclear Safety and Security

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