Prompt fissionγ-ray characteristics from neutron-induced fission on 239Pu and the time-dependence of prompt-γray emission
作者： Angélique Gatera , Alf Göök , Franz-Josef Hambsch , André Moens , Andreas Oberstedt
DOI: 10.1051/EPJCONF/201816900003
关键词:
摘要: Recent years have seen an increased interest in prompt fission γ-ray (PFG) measurements motivated by a high priority request of the OECD/NEA for precision data, mainly nuclear fuel isotopes 235 U and 239 Pu. Our group has conducted PFG measurement campaign using state-of-the-art lanthanum halide detectors all main actinides to better than 3%. The experiments were performed coincidence setup between trigger detectors. time-of-flight technique was used discriminate photons, traveling at speed light, neutrons. For full rejection neutrons below 20 MeV, time window should not be wider few nanoseconds. This includes most PFG, provided that no isomeric states populated during de-excitation process. When are populated, PFGs can still emitted up 1 yus after instant or later. To study these γ-rays, detector response had determined correction applied spectra.The latest results characteristics from reaction Pu(nth ,f) will presented, together with analysis 200 ns spontaneous 252 Cf as well thermal-neutron induced on compared calculations framework Hauser-Feshbach Monte Carlo code CGMF FIFRELIN.
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