Pulse Shape Simulation and Discrimination using Machine-Learning Techniques

TL;DR

This paper explores machine learning techniques, specifically Dense and Recurrent Neural Networks, to improve pulse shape discrimination in particle detection, especially in low-light scenarios where traditional methods struggle.

Contribution

It introduces neural network-based methods for pulse shape discrimination and compares their performance with conventional techniques in particle detection experiments.

Findings

Neural networks outperform traditional methods in low-light conditions.

Recurrent Neural Networks show superior discrimination accuracy.

Machine learning enhances particle identification in rare-event searches.

Abstract

An essential metric for the quality of a particle-identification experiment is its statistical power to discriminate between signal and background. Pulse shape discrimination (PSD) is a basic method for this purpose in many nuclear, high-energy and rare-event search experiments where scintillation detectors are used. Conventional techniques exploit the difference between decay-times of the pulses from signal and background events or pulse signals caused by different types of radiation quanta to achieve good discrimination. However, such techniques are efficient only when the total light-emission is sufficient to get a proper pulse profile. This is only possible when adequate amount of energy is deposited from recoil of the electrons or the nuclei of the scintillator materials caused by the incident particle on the detector. But, rare-event search experiments like direct search for dark matter do not always satisfy these conditions. Hence, it becomes imperative to have a method that can deliver a very efficient discrimination in these scenarios. Neural network based machine-learning algorithms have been used for classification problems in many areas of physics especially in high-energy experiments and have given better results compared to conventional techniques. We present the results of our investigations of two network based methods \viz Dense Neural Network and Recurrent Neural Network, for pulse shape discrimination and compare the same with conventional methods.