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Wilson JN, Lebois M, Qi L, et al. Anomalies in the Charge Yields of Fission Fragments from the ^{238}U(n,f) Reaction. Phys Rev Lett. 2017;118(22):222501doi: 10.1103/PhysRevLett.118.222501.
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, 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). Anomalies in the Charge Yields of Fission Fragments from the ^{238}U(n,f) Reaction. Physical review letters, 118(22), 222501. https://doi.org/10.1103/PhysRevLett.118.222501
Wilson, J N, et al. "Anomalies in the Charge Yields of Fission Fragments from the ^{238}U(n,f) Reaction." Physical review letters vol. 118,22 (2017): 222501. doi: https://doi.org/10.1103/PhysRevLett.118.222501
Wilson JN, Lebois M, Qi L, Amador-Celdran P, Bleuel D, Briz JA, Carroll R, Catford W, De Witte H, Doherty DT, 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 Z, Porta A, Regan PH, Reiter P, Rezynkina K, Rose SJ, Sahin E, Seidlitz M, Serot O, Shearman R, Siebeck B, Siem S, Smith AG, Tveten GM, Verney D, Warr N, Zeiser F, Zielinska M. Anomalies in the Charge Yields of Fission Fragments from the ^{238}U(n,f) Reaction. Phys Rev Lett. 2017 Jun 02;118(22):222501. doi: 10.1103/PhysRevLett.118.222501. Epub 2017 Jun 01. PMID: 28621970.
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Phys Rev Lett. 2017 Jun 02;118(22):222501. doi: 10.1103/PhysRevLett.118.222501. Epub 2017 Jun 01.

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

Physical review letters

J N Wilson, M Lebois, L Qi, P Amador-Celdran, D Bleuel, J A Briz, R Carroll, W Catford, H De Witte, D T Doherty, R Eloirdi, G Georgiev, A Gottardo, A Goasduff, K Hadyńska-Klęk, K Hauschild, H Hess, V Ingeberg, T Konstantinopoulos, J Ljungvall, A Lopez-Martens, G Lorusso, R Lozeva, R Lutter, P Marini, I Matea, T Materna, L Mathieu, A Oberstedt, S Oberstedt, S Panebianco, Zs Podolyák, A Porta, P H Regan, P Reiter, K Rezynkina, S J Rose, E Sahin, M Seidlitz, O Serot, R Shearman, B Siebeck, S Siem, A G Smith, G M Tveten, D Verney, N Warr, F Zeiser, M Zielinska

Affiliations

  1. Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France.
  2. European Commission, Joint Research Centre, Directorate G for Nuclear Safety and Security, Unit G.I.5, Postfach 2340, 76215 Karlsruhe, Germany.
  3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
  4. Subatech/Ecole des Mines, 4 rue Alfred Kastler, 44307 Nantes, France.
  5. Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
  6. Institute for Nuclear and Radiation Physics, KU Leuven, 3000 Leuven, Belgium.
  7. Irfu, CEA, Université Paris Saclay, 91191 Gif-sur-Yvette Cedex, France.
  8. CSNSM Orsay, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France.
  9. INFN Laboratori Nazionali di Legnaro, Viale dell'Universitá, 2, I-35020 Legnaro, Italy.
  10. Institut für Kernphysik, Zülpicher Strasse 77, 50937 Köln, Deutschland.
  11. University of Oslo, Department of Physics, P.O. Box 1048, Blindern, 0316 Oslo, Norway.
  12. National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
  13. LMU München, Schellingstrasse 4, 80799 Munich, Germany.
  14. CEA/DAM, DIF, Bruyeres-le-chatel, 91297 Arpajon, France.
  15. CENBG Bordeaux, Chemin du Solarium, Le Haut Vigneau, BP 120, 33175 Gradignan, France.
  16. Extreme Light Infrastructure-Nuclear Physics (ELI-NP), 077125 Bucharest-Magurele, Romania.
  17. European Commission, Joint Research Centre, Directorate G for Nuclear Safety and Security, Unit G.2, 2440 Geel, Belgium.
  18. CEA Cadarache, 13108 Saint Paul lez Durance, France.
  19. Department of Physics, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.

PMID: 28621970 DOI: 10.1103/PhysRevLett.118.222501

Abstract

Fast-neutron-induced fission of ^{238}U 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.

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