The ²³⁵U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE

¹ P-27, Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
² XCP-5, Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
³ T-2, Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
⁴ XCP-3, Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
⁵ Lawrence Livermore National Laboratory Livermore, CA 94550, USA

^a e-mail: Jaime.Gomez@lanl.gov
^b e-mail: devlin@lanl.gov

Published online: 13 September 2017

Abstract

The Chi-Nu experiment aims to accurately measure the prompt fission neutron spectrum for the major actinides. At the Los Alamos Neutron Science Center (LANSCE), fission can be induced with neutrons ranging from 0.7 MeV and above. Using a two arm time-of-flight (TOF) technique, the fission neutrons are measured in one of two arrays: a 22-⁶Li glass array for lower energies, or a 54-liquid scintillator array for outgoing energies of 0.5 MeV and greater. Presented here are the collaboration's preliminary efforts at measuring the ²³⁵U PFNS.