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NνDEx-100 conceptual design report

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Observing nuclear neutrinoless double beta(0νββ)decay would be a revolutionary result in particle physics.Observing such a decay would prove that the neutrinos are their own antiparticles,help to study the absolute mass of neutrinos,explore the origin of their mass,and may explain the matter-antimatter asymmetry in our universe by lepton number violation.We propose developing a time projection chamber(TPC)using high-pressure 82SeF6 gas and Topmetal silicon sensors for readout in the China Jinping Underground Laboratory(CJPL)to search for neutrinoless double beta decay of 82Se,called the NνDEx experiment.Besides being located at CJPL with the world's thickest rock shielding,NνDEx combines the advantages of the high Qββ(2.996 MeV)of 82Se and the TPC's ability to distinguish signal and background events using their different topological characteristics.This makes NνDEx unique,with great potential for low-background and high-sensitivity 0νββsearches.NνDEx-100,a NνDEx experiment phase with 100 kg of SeF6 gas,is being built,with plans to complete installation at CJPL by 2025.This report introduces 0νββ physics,the NνDEx concept and its advantages,and the schematic design of NνDEx-100,its subsystems,and background and sensitivity estimation.

Neutrinoless double beta decayTime projection chamber82SeF6China Jinping Underground Laboratory

Xi-Guang Cao、Yan-Long Chang、Kai Chen、Emilio Ciuffoli、Li-Min Duan、Dong-Liang Fang、Chao-Song Gao、Surja K.Ghorui、Peng-Chong Hu、Qiang Hu、Si-Yuan Huang、Ze-Yu Huang、Lei Lang、Yu-Lan Li、Zhi-Jie Li、Tian-Yu Liang、Jun Liu、Chen-Gui Lu、Fa-Tai Mai、Yuan Mei、Hao Qiu、Xiang-Ming Sun、Xiao-Xing Tang、Hu-Lin Wang、Qian-Ming Wang、Le Xiao、Mu-Yun Xiao、Jian-Yu Xin、Nu Xu、Peng Yang、Yi-Chen Yang、Zhen Yang、Zong-Yang Yu、Dong-Liang Zhang、Jun-Wei Zhang、Cheng-Xin Zhao、Dou Zhu、NνDEx-100 collaboration

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Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China

Lanzhou University,Lanzhou 730000,China

Central China Normal University,Wuhan 430079,China

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China

Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA

North China University of Water Resources and Electric Power,Zhengzhou 450045,China

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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaFrom-0-to-1 Original Innovation Program of Chinese Academy of SciencesInternational Partner Program of Chinese Academy of SciencesNational Natural Science Foundation of China Youth Science Fund Project

2021YFA16013002022YFA1604703ZDBS-LY-SLH014GJHZ206712105110

2024

10.1007/s41365-023-01360-7

核技术(英文版)
中国科学院上海应用物理研究所,中国核学会

核技术(英文版)

CSTPCDEI
影响因子：0.667
ISSN：1001-8042
年,卷(期)：2024.35(1)
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