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n_TOF Collaboration(Sanchez-Caballero, A. et al), Babiano-Suarez, V., Balibrea-Correa, J., Domingo-Pardo, C., Ladarescu, I., & Lerendegui-Marco, J. (2026). Low-uncertainty measurement of the 239Pu(n,f) cross section at n_TOF in a very broad energy range from 0.02 eV up to 10 MeV. Phys. Lett. B, 872, 140070–8pp.
Abstract: The Pu-239(n,f) cross section was measured with uncertainties below 4% from 20 meV up to 10 MeV of neutron energy at CERN's n_TOF facility using a novel fission fragment detector with a 185.59 m flight path. Measured cross section was normalized to 1059(6) eV center dot b in the 9-20 eV energy range, and is consistent within uncertainties with the standard thermal value and the IAEA reference Pu-239(n,f) cross section. Experimental key values include the integral ratio I-3/I-1= 41.20(42) defined by Duran et al. 2024 and the spectrum averaged cross section in Cf-252(sf) reference neutron field of 1802(40) mb.
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