Optimization and first electronic implementation of the Constant-Fraction Time-Over-Threshold pulse shape discrimination method
Abstract
In this contribution we report on further investigations of the recently-evaluated Constant-Fraction Time-over-Threshold (CF-ToT) method for neutron/gamma-ray pulse shape discrimination (PSD). The superiority of the CF-ToT PSD method over the constant-threshold (CT-ToT) method was previously demonstrated, down to low neutron energy thresholds of 100 keVee. Here, we report on a quantitative comparison between the traditionally used Charge Comparison (CC) method and the CF-ToT method using a stilbene scintillator coupled to a silicon photomultiplier, implementing an offline analysis of recorded fast-neutron and gamma-ray waveforms. An optimization of the constant fraction value indicates that a 20%-fraction yields the optimum figure-of-merit (FOM) and gamma-ray peak-to-valley (P/V) ratio. The results obtained for a particle energy threshold of 100 keVee show that the FOM and P/V values achieved with the CF-ToT method are superior to those obtained using the standard CC method. In addition, a first electronic implementation of the CF-ToT method was performed using simple circuitry suitable for multichannel architecture. Initial results obtained with this circuit prototype are presented.
Cite
@article{arxiv.2212.09711,
title = {Optimization and first electronic implementation of the Constant-Fraction Time-Over-Threshold pulse shape discrimination method},
author = {A. Roy and D. Vartsky and I. Mor and C. Boiano and S. Brambilla and S. Riboldi and E. O. Cohen and Y. Yehuda-Zada and A. Beck and L. Arazi},
journal= {arXiv preprint arXiv:2212.09711},
year = {2023}
}
Comments
10 pages, 8 figures. To be submitted to JINST