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, W.; 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.; Podolyák, Zs.; 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.

doi:10.1103/PhysRevLett.118.222501

Title: Anomalies in the Charge Yields of Fission Fragments from the ${}^{238}{U (n, f)}$ Reaction

Journal Article · Thu Jun 01 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.222501· OSTI ID:1378544

Wilson, J. N. ^[1]; Lebois, M. ^[1]; Qi, L. ^[1]; Amador-Celdran, P. ^[2]; Bleuel, D. ^[3]; Briz, J. A. ^[4]; Carroll, R. ^[5]; Catford, W. ^[5]; De Witte, H. ^[6]; Doherty, D. T. ^[7]; Eloirdi, R. ^[2]; Georgiev, G. ^[8]; Gottardo, A. ^[1]; Goasduff, A. ^[8]; Hadyńska-Klęk, K. ^[9]; Hauschild, K. ^[8]; Hess, H. ^[10]; Ingeberg, V. ^[11]; Konstantinopoulos, T. ^[8]; Ljungvall, J. ^[8] more »

Univ. Paris-Sud, Orsay (France). Inst. de Physique Nucleaire
European Commission, Karlsruhe (Germany). Joint Research Centre
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Subatech/Ecole des Mines, Nantes (France)
Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
Katholieke Univ. Leuven, Leuven (Belgium). Inst. for Nuclear and Radiation Physics
Univ. Paris-Saclay, Gif-sur-Yvette (France)
Centre National de la Recherche Scientifique (CNRS), Orsay (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3), Centre de Sciences Nucleaires et de Sciences de la Matiere (CSNSM)
National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)
Inst. fur Kernphysik, Koln (Deutschland)
Univ. of Oslo (Norway). Dept. of Physics
National Physical Lab., Middlesex (United Kingdom)
Ludwig Maximilian Univ., Munich (Germany)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Centre d'Etudes Nucleaires de Bordeaux-Gradignan, Gradignan (France)
Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Bucharest-Magurele (Romania)
European Commission, Geel (Belgium). Joint Research Centre
Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics; National Physical Lab., Middlesex (United Kingdom)
Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
Univ. of Manchester (United Kingdom). Dept. of Physics

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. Finally, 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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; Research Council of Norway; Science and Technology Facilities Council (STFC), UK

Grant/Contract Number:: AC52-07NA27344; 05P15PKCIA; 222287

OSTI ID:: 1378544

Report Number(s):: LLNL-JRNL-737167; PRLTAO; TRN: US1702815

Journal Information:: Physical Review Letters, Vol. 118, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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