A prototype detector for directional measurement of the cosmogenic neutron flux
Author(s)Lopez, J.; Terao, Kazuhiro; Conrad, Janet; Dujmic, Denis; Winslow, Lindley
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This paper describes a novel directional neutron detector. The low pressure time projection chamber uses a mix of helium and CF[subscript 4] gases. The detector reconstructs the energy and angular distribution of fast neutron recoils. This paper reports results of energy calibration using an α source and angular reconstruction studies using a collimated neutron source. The best performance is obtained with a 12.5% CF[subscript 4]–87.5% He gas mixture. At low energies the target for fast neutrons transitions is primarily helium, while at higher energies, the fluorine contributes as a target. The reconstruction efficiency is both energy and target dependent. For neutrons with energies less than 20 MeV, the reconstruction efficiency is ∼40% for fluorine recoils and ∼60% for helium recoils.
DepartmentMassachusetts Institute of Technology. Department of Physics
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Lopez, J., K. Terao, J.M. Conrad, D. Dujmic, and L. Winslow. “A Prototype Detector for Directional Measurement of the Cosmogenic Neutron Flux.” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 673 (May 2012): 22–31.
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