Applications of (CLYC)-L-7 scintillators in fast neutron spectroscopy

The capabilities of Li-enriched Cs LiYCl (CLYC) scintillation detectors for fast neutron spectroscopy are explored in benchmark experiments that exploit its excellent pulse-shape discrimination between neutrons and rays, and its unprecedented 10% energy resolution for fast neutrons in the few MeV range, obtained through the 35Cl(n,p) reaction. Energy- and angle-resolved elastic and inelastic neutron scattering cross-section measurements of 56Fe(n,n') were performed at Los Alamos National Laboratory with a pulsed white neutron source and an array of CLYC crystals. The results convincingly establish the utility of this dual n/ scintillator for fast neutron spectroscopy. Intrinsic efficiency measurements of both and the first ever CLYC crystal have been initiated, using mono-energetic fast neutron beams at UMass Lowell generated via the Li(p,n) reaction. The spectroscopic capabilities and potential of CLYC are discussed in the context of developing this emerging scintillator for targeted science applications.The work was supported by the U.S. Department of Energy (DOE) NNSA Stewardship Science Academic Alliance program Grants DE- NA0001988 and DE-NA0002932, and Office of Science Grant DE-FG02-94ER40848. Portions of this work benefited from use of the LANSCE accelerator facility supported under DOE Contract No. DE- AC52-06NA2539

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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

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

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