First Direct Measurement of Isotopic Fission-Fragment Yields of $^{239}$U
RAMOS, D.
Institut de Physique Nucléaire d'Orsay [IPNO]
Grand Accélérateur National d'Ions Lourds [GANIL]
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Institut de Physique Nucléaire d'Orsay [IPNO]
Grand Accélérateur National d'Ions Lourds [GANIL]
Language
en
Article de revue
This item was published in
Physical Review Letters. 2019, vol. 123, n° 9, p. 092503
American Physical Society
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Nuclear Physics
Origin
Hal imported