Anomalies in the Charge Yields of Fission Fragments from the 238U(n,f) Reaction
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.
WILSON J. N.;
LEBOIS M.;
QI Liqiang;
AMADOR CELDRAN Pedro;
BLEUEL D. L.;
BRIZ J. A.;
CARROLL R.;
CATFORD W.;
DE WITTE H.;
DOHERTY D.;
ELOIRDI Rachel;
GEORGIEV 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 Stephan;
PANEBIANCO 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.;
2017-08-01
AMER PHYSICAL SOC
JRC105932
0031-9007,
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.222501,
https://publications.jrc.ec.europa.eu/repository/handle/JRC105932,
10.1103/PhysRevLett.118.222501,
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