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. et al, 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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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.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Name Email ORCID Wilson, J. N. Lebois, M. Qi, L. Amador-Celdran, P. Bleuel, D. Briz, J. A. Carroll, R. Catford, Wilton W.Catford@surrey.ac.uk 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 Z.Podolyak@surrey.ac.uk Porta, A. Regan, Patrick P.Regan@surrey.ac.uk Reiter, P. Rezynkina, K. Rose, S. J. Sahin, E. Seidlitz, M. Serot, O. Shearman, Robert r.shearman@surrey.ac.uk 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 http://dx.doi.org/10.1103/PhysRevLett.118.222501. 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: https://journals.aps.org/open_access.html for details.
Depositing User :	Clive Harris
Date Deposited :	08 Jun 2017 10:55
Last Modified :	16 Jan 2019 18:53
URI:	http://epubs.surrey.ac.uk/id/eprint/841338

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