The 239Pu (n, f) cross section was measured with uncertainties below 4 % from 20 meV up to 10 MeV of neutron energy at CERN’s nTOF facility using a novel fission fragment detector with a 185. 59 m flight path. Measured cross section was normalized to 1059 (6) eV · b in the 9–20 eV energy range, and is consistent within uncertainties with the standard thermal value and the IAEA reference 239Pu (n, f) cross section. Experimental key values include the integral ratio I3/I1=41. 20 (42) defined by Duran et al. 2024 and the spectrum averaged cross section in 252Cf (sf) reference neutron field of 1802 (40) mb.
A Thu, study studied this question.