NνDEx-100 conceptual design report  

作　　者：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 

机构地区：[1]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China [2]Lanzhou University,Lanzhou 730000,China [3]Central China Normal University,Wuhan 430079,China [4]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [5]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [6]Lawrence Berkeley National Laboratory,Berkeley,CA 94720,USA [7]North China University of Water Resources and Electric Power,Zhengzhou 450045,China [8]不详

出　　处：《Nuclear Science and Techniques》2024年第1期18-33,共16页核技术（英文）

基　　金：This work was supported by the National Key Research and Development Program of China(Nos.2021YFA1601300 and 2022YFA1604703);From-0-to-1 Original Innovation Program of Chinese Academy of Sciences(No.ZDBS-LY-SLH014);International Partner Program of Chinese Academy of Sciences(No.GJHZ2067);National Natural Science Foundation of China Youth Science Fund Project(No.12105110).

摘　　要：Observing nuclear neutrinoless double beta (0vββ) 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 ^(82)SeF_(6) gas and Topmetal silicon sensors for readout in the China Jinping Underground Laboratory (CJPL) to search for neutrinoless double beta decay of82Se,called the NvDEx experiment.Besides being located at CJPL with the world’s thickest rock shielding,NvDEx combines the advantages of the high Qββ(2.996 MeV) of82Se and the TPC’s ability to distinguish signal and background events using their different topological characteristics.This makes NvDEx unique,with great potential for low-background and high-sensitivity 0 vββsearches.NvDEx-100,a NvDEx experiment phase with 100 kg of SeF_(6)gas,is being built,with plans to complete installation at CJPL by 2025.This report introduces 0 vββ physics,the NvDEx concept and its advantages,and the schematic design of NvDEx-100,its subsystems,and background and sensitivity estimation.

关 键 词：Neutrinoless double beta decay Time projection chamber ^(82)SeF_(6) China Jinping Underground Laboratory 

分 类 号：O572.321[理学—粒子物理与原子核物理] O571.3[理学—物理]