Total prompt γ-ray emission in fission

¹ Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
² North Carolina State University, Raleigh, NC 27694, USA
³ National Superconducting Cyclotron Laboratory, East Lansing, MI 48824, USA
⁴ Los Alamos National Laboratory, Los Alamos, NM 87545, USA

^a e-mail: wu24@llnl.gov

Published online: 13 September 2017

Abstract

The total prompt γ-ray energy distributions were measured 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 using the Detector for Advanced Neutron Capture Experiments (DANCE) array in coincidence with the detection of fission fragments by a parallel-plate avalanche counter. Corrections were made to the measured distribution by unfolding the two-dimension spectrum of total prompt γ-ray energy vs multiplicity using a simulated DANCE response matrix. A summary of this work is presented with the emphasis on the comparison of total prompt fission γ-ray energy between our results and previous ones. The mean values of the total prompt γ-ray energy ⟨Eγ,tot⟩, determined from the unfolded distributions, are ∼20% higher than those derived from measurements using single γ-ray detector for all the fissile nuclei studied.