RAMOS, D.; CAAMAÑO, M.; LEMASSON, A.; REJMUND, M.; AUDOUIN, L.; ÁLVAREZ-POL, H.; FRANKLAND, J.D.; FERNÁNDEZ-DOMÍNGUEZ, B.; GALIANA-BALDÓ, E.; PIOT, J.; ACKERMANN, D.; BISWAS, S.; CLEMENT, E.; DURAND, D.; FARGET, F.; FREGEAU, M.O.; GALAVIZ, D.; HEINZ, A.; HENRIQUES, A.I.; JACQUOT, B.; JURADO, B.; KIM, Y.H.; MORFOUACE, P.; RALET, D.; ROGER, T.; SCHMITT, C.; TEUBIG, P.; TSEKHANOVICH, I.

doi:10.1103/PhysRevLett.123.092503

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RAMOS, D.
Institut de Physique Nucléaire d'Orsay [IPNO]
Grand Accélérateur National d'Ions Lourds [GANIL]

CAAMAÑO, M.

LEMASSON, A.
Grand Accélérateur National d'Ions Lourds [GANIL]

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Physical Review Letters. 2019, vol. 123, n° 9, p. 092503

American Physical Society

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A direct and complete measurement of isotopic fission-fragment yields of U239 has been performed for the first time. The U239 fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a U238 beam and a Be9 target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. The measurement allows us to directly evaluate the fission models at excitation energies of fast neutrons, which are relevant for next-generation nuclear reactors. The present data, in agreement with model calculations, do not support the recently reported anomaly in the fission-fragment yields of U239, and they confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by a few mega-electron volts.< Réduire

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Nuclear Physics

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First Direct Measurement of Isotopic Fission-Fragment Yields of $^{239}$U

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