Solar neutrino background in high-pressure gaseous ^(82)SeF_(6) TPC neutrinoless double beta decay experiments  

作　　者：王杰妙 汪虎林 张冬亮 Jiemiao Wang;Hulin Wang;Dongliang Zhang(PLAC,Key Laboratory of Quark and Lepton Physics(MOE),Central China Normal University,Wuhan 430079,China;Hubei Provincial Engineering Research Center of Silicon Pixel Chip&Detection Technology,Wuhan 430079,China)

机构地区：[1]PLAC,Key Laboratory of Quark and Lepton Physics(MOE),Central China Normal University,Wuhan 430079,China [2]Hubei Provincial Engineering Research Center of Silicon Pixel Chip&Detection Technology,Wuhan 430079,China

出　　处：《Chinese Physics C》2024年第4期20-33,共14页中国物理C（英文版）

基　　金：the National Natural Science Foundation of China(12105110);National Key Research and Development Program of China(2022YFA1604703)。

摘　　要：In this study,the possibility of observing a solar neutrino background in a future neutrinoless double beta decay experiment using a high-pressure gaseous ^(82)SeF_(6) TPC is investigated.Various contributions are simulated,and possible features that could be used for event classification are discussed;two types of backgrounds are identified.The rate of multi-site background events is approximately 0.63 events/(ton·yr)in a 30 keV ROI window.This background could be effectively reduced to less than 0.0001 events/(ton·yr)(95%C.L.)while maintaining a high signal efficiency of 93%by applying a selection based on the number of clusters and energy of the leading cluster.The rate of the single-electron background events is approximately 0.01 events/(ton·yr)in the ROI.Assuming a reduction factor of 10 for the single-electron background events obtained via the algorithms developed for radioactive background rejection,the total background induced by the solar neutrino would be 0.001 events/(ton·yr),which is sufficiently small for conducting ton-level experiments.

关 键 词：neutrinoless double beta decay SeF6 high-pressure TPC solar neutrino 

分 类 号：O572.321[理学—粒子物理与原子核物理]