First Direct Measurement of Isotopic Fission-Fragment Yields of 239U
Artikel i vetenskaplig tidskrift, 2019

A direct and complete measurement of isotopic fission-fragment yields of U-239 has been performed for the first time. The U-239 fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a U-239 beam and a Be-9 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 U-239, 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.
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Publicerad i

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 123 Nummer/häfte 9 art. nr 092503

Kategorisering

Ämneskategorier (SSIF 2011)

Acceleratorfysik och instrumentering

Subatomär fysik

Atom- och molekylfysik och optik

Identifikatorer

DOI

10.1103/PhysRevLett.123.092503

PubMed

31524478

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Senast uppdaterat

2019-10-24