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Non-linearity of recoil pulse height events in He-3 tubes

Regarding neutron spectrometry, energy calibration of a He-3 counter was performed for neutron energies up to about 7 MeV, for various operating voltages in the proportionality region. Full-energy peak position is linearly correlated with neutron energy, while the position of the 3He recoil peak dev...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2010-06, Vol.618 (1), p.284-293
Main Authors: Manolopoulou, M., Fragopoulou, M., Stoulos, S., Westmeier, W., Lagogiannis, A., Zamani, M.
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container_title Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
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creator Manolopoulou, M.
Fragopoulou, M.
Stoulos, S.
Westmeier, W.
Lagogiannis, A.
Zamani, M.
description Regarding neutron spectrometry, energy calibration of a He-3 counter was performed for neutron energies up to about 7 MeV, for various operating voltages in the proportionality region. Full-energy peak position is linearly correlated with neutron energy, while the position of the 3He recoil peak deviates from a linear response, especially in the lower energy region. By means of the linear full-energy peak calibration, recoil peak energies are found to be significantly lower than those resulting from the kinematics of the reaction. The pulse-height loss is attributed to initial recombination. Using the Bragg curve of the recoiling nucleus in the counter gas mixture, it is determined that the pulse-height loss corresponds to a constant portion, 33.5±1.3 %, of the fraction of energy deposited by a 3He nucleus traversing the gas mixture with a stopping power higher than 450 eV/μm. The energy calibration equation for the recoil peaks is derived using the following: (i) the range-energy relation and the stopping power function for a 3He nucleus in the gas mixture where the coefficients of both functions were determined via Monte Carlo calculations, and (ii) the experimentally determined recombination coefficient.
doi_str_mv 10.1016/j.nima.2010.02.267
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identifier ISSN: 0168-9002
ispartof Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 2010-06, Vol.618 (1), p.284-293
issn 0168-9002
1872-9576
language eng
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source ScienceDirect Journals
subjects Calibration
Energy (nuclear)
Gas mixtures
He-3
Mathematical analysis
Monte Carlo methods
Neutron detectors
Neutron measurements
Nuclei
Proportional counters
Recoil
Stopping power
title Non-linearity of recoil pulse height events in He-3 tubes
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