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Publication Citation: Event Identification in He-3 Proportional Counters Using Risetime Discrimination

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Author(s): Jeffrey S. Nico; T J. Langford; Christopher D. Bass; E J. Beise; D. K. Erwin; Craig Heimbach;
Title: Event Identification in He-3 Proportional Counters Using Risetime Discrimination
Published: April 02, 2013
Abstract: We present a straightforward method for particle identification and background rejection in He-3 proportional counters for use in neutron detection. By measuring the risetime and pulse height of the preamplifier signals, one may define a region in the risetime versus pulse height space where the events are predominately from neutron interactions. For the proportional counters used in this study, there is an alpha-particle rejection of 96%. By applying the same method, we also show an effective rejection of microdischarge noise events that, when passed through a shaping amplifier, are indistinguishable from physical events in the counters. The primary application of this method is in measurements where the signal-to-background for counting neutrons is very low, such as in underground laboratories.
Citation: Nuclear Instruments & Methods in Physics Research
Pages: pp. 51 - 57
Keywords: He-3; neutron detection; proportional counters
Research Areas: Neutron Physics
DOI: http://dx.doi.org/10.1016/j.nama.2013.03.062  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (751KB)