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Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, Wilton, De Witte, H., Doherty, D. T. , Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadyńska-Klęk, K., Hauschild, K., Hess, H., 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, S., Panebianco, S., Podolyak, Zsolt, Porta, A., Regan, Patrick, Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, Robert, Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F. and Zielinska, M. (2017) Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction Physical Review Letters, 118 (22). pp. 222501-1.

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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Wilson, J. N.
Lebois, M.
Qi, L.
Amador-Celdran, P.
Bleuel, D.
Briz, J. A.
Carroll, R.
De Witte, H.
Doherty, D. T.
Eloirdi, R.
Georgiev, G.
Gottardo, A.
Goasduff, A.
Hadyńska-Klęk, K.
Hauschild, K.
Hess, H.
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, S.
Panebianco, S.
Porta, A.
Reiter, P.
Rezynkina, K.
Rose, S. J.
Sahin, E.
Seidlitz, M.
Serot, O.
Siebeck, B.
Siem, S.
Smith, A. G.
Tveten, G. M.
Verney, D.
Warr, N.
Zeiser, F.
Zielinska, M.
Date : 1 June 2017
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevLett.118.222501
Copyright Disclaimer : © 2017 American Physical Society. This is the published version of the following article: J.M. Wilson et al, 'Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction', in Physical Review Letters 118:22, 222501, which has been published at This article may be used under the terms of the Creative Commons Attribution license 4.0 for non-commercial purposes in accordance with the publisher's Terms and Conditions for Self-Archiving. See: for details.
Depositing User : Clive Harris
Date Deposited : 08 Jun 2017 10:55
Last Modified : 16 Jan 2019 18:53

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