EPJ Web of Conferences (Jan 2016)

Total prompt γ-ray emission in fission

  • Wu C.Y.,
  • Chyzh A.,
  • Kwan E.,
  • Henserson R.A.,
  • Bredeweg T.A.,
  • Haight R.C.,
  • Hayes-Sterbenz A.C.,
  • Lee H.Y.,
  • O’Donnell J.M.,
  • Ullmann J.L.

DOI
https://doi.org/10.1051/epjconf/201612201011
Journal volume & issue
Vol. 122
p. 01011

Abstract

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The total prompt γ-ray energy distributions for the neutron-induced fission of 235U, 239,241Pu at incident neutron energy of 0.025 eV ‒ 100 keV, and the spontaneous fission of 252Cf were measured using the Detector for Advanced Neutron Capture Experiments (DANCE) array in coincidence with the detection of fission fragments by a parallel-plate avalanche counter. DANCE is a highly segmented, highly efficient 4π γ-ray calorimeter. Corrections were made to the measured distribution by unfolding the two-dimension spectrum of total γ-ray energy vs multiplicity using a simulated DANCE response matrix. The mean values of the total prompt γ-ray energy, determined from the unfolded distributions, are ~ 20% higher than those derived from measurements using single γ-ray detector for all the fissile nuclei studied. This raises serious concern on the validity of the mean total prompt γ-ray energy obtained from the product of mean values for both prompt γ-ray energy and multiplicity.