A prototype detector for directional measurement of the cosmogenic neutron flux

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• 作者：J. Lopez ; K. Terao ; J.M. Conrad ; D. Dujmic ; L. Winslow ; ^{lwinslow@MIT.EDU}
• 关键词：Neutron detector ; Neutron production ; Muon interactions ; Neutrino
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2012
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：1 May, 2012
• 卷：673
• 期：Complete
• 页码：22-31
• 文件大小：2181 K

摘要

This paper describes a novel directional neutron detector. The low pressure time projection chamber uses a mix of helium and CF₄ gases. The detector reconstructs the energy and angular distribution of fast neutron recoils. This paper reports results of energy calibration using an source and angular reconstruction studies using a collimated neutron source. The best performance is obtained with a 12.5%CF₄-87.5%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 for fluorine recoils and for helium recoils.