In this paper we present new results for prompt fission γ-ray spectral characteristics from the thermal neutron induced fission of 240 Pu *. The measured spectra were unfolded by using the detectors' response functions, simulated with GEANT4. We obtained in average per fission a γ-ray multiplicityM γ = (7.35 ± 0.12), a mean photon energy¯ γ = (0.85 ± 0.02) MeV, and an average total energy released in fissionĒ γ,tot = (6.27 ± 0.11) MeV. Our results are in good agreement with historical data measured in the 1970s by Verbinski et al. and results from recent calculations in the framework of Monte Carlo Hauser-Feshbach models. Our measured average total energy is slightly smaller than the one deduced previously and present in evaluated data. From this we conclude that the 239 Pu(n th ,f) reaction may be ruled out as possible source of γ heating underestimation, when compared with benchmark calculations based on existing nuclear data.
Abstract. Prompt fission gamma-ray spectra (PFGS) have been measured for the 239 Pu(n,f) reaction using fast neutrons atĒ n =1.81 MeV produced by the LICORNE directional neutron source. The setup makes use of LaBr 3 scintillation detectors and PARIS phoswich detectors to measure the emitted prompt fission gamma rays (PFG). The mean multiplicity, average total energy release per fission and average energy of photons are extracted from the unfolded PFGS. These new measurements provide complementary information to other recent work on thermal neutron induced fission of 239 Pu and spontaneous fission of 252 Cf.
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