EPJ Web of Conferences 169, 00018 (2018)
https://doi.org/10.1051/epjconf/201816900018

Prompt fission gamma-ray emission spectral data for ²³⁹Pu(n,f) using fast directional neutrons from the LICORNE neutron source

¹ Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
² Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
³ CEA, DAM, DIF, 91297 Arpajon, France
⁴ Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Magurele, Romania
⁵ European Commission, Joint Research Centre, Directorate G for Nuclear Safety and Security, Unit G.2, 2440 Geel, Belgium
⁶ CSNSM Orsay, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
⁷ The Henryk Niewodniczański Institute of Nuclear Physics, 31-342 Krakow, Poland
⁸ University of Oslo, Department of Physics, P.O. Box 1048, Blindern 0316 Oslo, Norway
⁹ Grand Accélérateur National d’Ions Lourd, Bd. Henri Becquerel, BP. 55027, 14076 Caen Cedex 05, France

^* e-mail: wilson@ipno.in2p3.fr

Published online: 6 March 2018

Abstract

Prompt fission gamma-ray spectra (PFGS) have been measured for the ²³⁹Pu(n,f) reaction using fast neutrons at Ē_n=1.81 MeV produced by the LICORNE directional neutron source. The setup makes use of LaBr₃ 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 ²³⁹Pu and spontaneous fission of ²⁵²Cf.