e$^{+}$/e$^{-}$ Discrimination in Liquid Scintillator and Its Usage to Suppress $^{8}$He/$^{9}$Li Backgrounds
Instrumentation and Detectors
2016-09-15 v2 High Energy Physics - Experiment
Abstract
Reactor neutrino experiments build large-scale detector systems to detect neutrinos. In liquid scintillator, a neutral bound state of a positron and an electron, named positronium, can be formed. The spin triplet state is called ortho-positronium (o-Ps). In this article, an experiment is designed to measure the lifetime of o-Ps, giving a result of 3.1 ns. A PSD parameter based on photon emission time distribution (PETD) was constructed to discriminate e/e. Finally, the application of e/e discrimination in the JUNO experiment is shown. It helps suppress He/Li backgrounds and improves the sensitivity by 0.6 in analysis with an assumption of =1 ns PMT Transit Time Spread, which will bring a smearing effect to the PETD.
Keywords
Cite
@article{arxiv.1605.00941,
title = {e$^{+}$/e$^{-}$ Discrimination in Liquid Scintillator and Its Usage to Suppress $^{8}$He/$^{9}$Li Backgrounds},
author = {Ya-Ping Cheng and Liang-Jian Wen and Peng Zhang and Xing-Zhong Cao},
journal= {arXiv preprint arXiv:1605.00941},
year = {2016}
}
Comments
6 pages,8 figures