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Träfflista för sökning "WFRF:(Fregeau M. O.) srt2:(2019)"

Sökning: WFRF:(Fregeau M. O.) > (2019)

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1.
  • Mantovani, G., et al. (författare)
  • Study of High-Energy Fission in Inverse Kinematics
  • 2019
  • Ingår i: IV INTERNATIONAL CONFERENCE ON NUCLEAR STRUCTURE AND DYNAMICS (NSD2019). - : EDP Sciences. - 2100-014X. - 9782759890842 ; 223
  • Konferensbidrag (refereegranskat)abstract
    • Fission at low excitation energy, is a process in which both macroscopic and microscopic aspects are involved. Some features in the total kinetic energy and in the N/Z distributions of the fragments, commonly associated with shell effects, came out in a series of recent experiments with high excitation energy fusion fission reactions in inverse kinematics. In the latest experiment of this campaign, a study of high-energy fission and quasi-fission between a U-238 beam and a series of light targets was carried out by using the aforementioned technique, in order to probe the role of the shell structure in these processes.
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2.
  • Ramos, D., et al. (författare)
  • First Direct Measurement of Isotopic Fission-Fragment Yields of 239U
  • 2019
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 123:9
  • Tidskriftsartikel (refereegranskat)abstract
    • 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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