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, Amanda; 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

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WILSON, J.N.
Institut de Physique Nucléaire d'Orsay [IPNO]

LEBOIS, M.
Institut de Physique Nucléaire d'Orsay [IPNO]

QI, L.
Institut de Physique Nucléaire d'Orsay [IPNO]

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Physical Review Letters. 2017, vol. 118, n° 22, p. 222501

American Physical Society

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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 $\gamma$-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via $\gamma$-$\gamma$ 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.< Réduire

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

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