Pulse Shape Simulation and Discrimination using Machine-Learning Techniques

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.

18 pages, 39 figures

References in corpus (6)

• Neutrino interaction classification with a convolutional neural network in the DUNE far detector
• CsI(Tl) Pulse Shape Discrimination with the Belle II Electromagnetic Calorimeter as a Novel Method to Improve Particle Identification at Electron-Positron Colliders
• Boosted top quark tagging and polarization measurement using machine learning
• Measurements of gamma ray, cosmic muon and residual neutron background fluxes for rare event search experiments at an underground laboratory
• An Exact Formula to Describe the Amplification Process in a Photomultiplier Tube
• Neutron calibration facility with an Am-Be source for pulse shape discrimination measurement of CsI(Tl) crystals

Cited by in corpus (2)

• Pulse Shape Discrimination Algorithms: Survey and Benchmark
• Scintillation pulse characterization with spectrum-inspired temporal neural networks: case studies on particle detector signals