Rejection of backgrounds from pileup alpha coincidences in the SNO+ detector

Topical Research Meeting: Prospects in Neutrino Physics

Majumdar, K.^1

Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford

OX1 3RH, United Kingdom^1

关键词: Beta decay;    Half lives;    Multi-purpose;    Neutrino detectors;    Neutrinoless double-beta decays;    Process mean;    Radioactive decay;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/598/1/012023/pdf
DOI  :  10.1088/1742-6596/598/1/012023

来源: IOP

【 摘 要 】

SNO+ is a multi-purpose neutrino detector with a number of physics goals, one of which is to investigate the existence of Neutrinoless Double Beta Decay. The potential rarity of this process means that other radioactive decays occurring in and around the detector can become major background sources. Two such backgrounds are the β decays of214Bi and212Bi, which are followed by the a decays of their respective daughters:214Po and212Po. These daughters have relatively short half-lives, and so these β-α coincidences can form pileup events in the detector. Two methods are presented here for rejecting such pileup coincidence events.