The goal of the Chi-Nu experiment at the Los Alamos Neutron Science Center is to measure the prompt fission neutron spectra from major actinides using a double time-of-flight method with a pulsed, white incoming neutron source. Fission events are detected with a parallel-plate avalanche counter and outgoing neutrons are detected with either a 6Li-glass or liquid scintillator detector array for low- or high-energy neutrons, respectively. A detector response matrix for the interaction of neutrons with the experimental environment for neutrons measured with the Chi-Nu 6Li-glass detector array has been calculated to obtain a full understanding of the measured Chi-Nu data and also to allow for nearly instantaneous production of simulated Chi-Nu data spectra. Prompt fission neutron spectra corresponding to 19 incoming neutron energy ranges from 0.7-20 MeV have been extracted using the ratio-of-ratios method with Chi-Nu 6Li-glass data on the neutron-induced fission of 235U.

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pulsed prompt fission neutron spectra highenergy neutrons parallelplate avalanche counter neutroninduced fission of 235u double timeofflight method low detector response environment 6liglass or liquid scintillator detector array

Kelly Keegan J.,Devlin Matthew,Gomez Jaime A.,O’Donnell John M.,Taddeucci Terry N.,Haight Robert C.,Lee Hye Young,Mosby Shea M.,Fotiades Nikolaos,Neudecker Denise,Talou Patrick,Rising Michael E.,White Morgan C.,Solomon Clell J.,Wu Ching-Yen,Bucher Brian,Buckner Matthew Q.,Henderson Roger A.,.Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment. 193 (),.

Kelly Keegan J.,Devlin Matthew,Gomez Jaime A.,O’Donnell John M.,Taddeucci Terry N.,Haight Robert C.,Lee Hye Young,Mosby Shea M.,Fotiades Nikolaos,Neudecker Denise,Talou Patrick,Rising Michael E.,White Morgan C.,Solomon Clell J.,Wu Ching-Yen,Bucher Brian,Buckner Matthew Q.,Henderson Roger A.,"Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment" 193

Kelly Keegan J.,Devlin Matthew,Gomez Jaime A.,O’Donnell John M.,Taddeucci Terry N.,Haight Robert C.,Lee Hye Young,Mosby Shea M.,Fotiades Nikolaos,Neudecker Denise,Talou Patrick,Rising Michael E.,White Morgan C.,Solomon Clell J.,Wu Ching-Yen,Bucher Brian,Buckner Matthew Q.,Henderson Roger A.,"Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment"