Devlin, M; Gomez, JA; Kelly, KJ; Haight, RC; O'Donnell, JM; Taddeucci, TN; Lee, HY; Mosby, SM; Perdue, BA; Fotiades, N; Ullmann, JL; Wu, CY; Bucher, B; Buckner, MQ; Henderson, RA; Neudecker, D; White, MC; Talou, P; Rising, ME; Solomon, CJ
New prompt fission neutron spectrum measurements are reported for U-235(n, f) reactions induced by neutrons with energies from 0.7 to 20 MeV. These measurements cover outgoing neutron energies from 2.5 MeV down to 10 keV, using an array of 6 Li-glass scintillators for neutron detection and a double time-of-flight technique. The neutrons were produced at the Weapons Neutron Research facility of the Los Alamos Neutron Science Center. A detailed MCNP (R) model of the experimental equipment and the surrounding room was used to interpret the experimental results. Backgrounds were measured in situ, making use of the time-dependent singles rates of the various detectors with asynchronous readout from waveform digitizers. The results presented here have been included in a re-evaluation of the fission neutron spectra for this fissioning system, a description of which is presented elsewhere in this issue.