supported in part by the National Key R&D Program of China(2018YFA0404100);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA10010100);the National Natural Science Foundation of China(11605081,11775231,11775232,11835013,11820101005);the CAS Center for Excellence in Particle Physics
We emphasize that it is extremely important for future neutrinoless double-beta(0νββ)decay experiments to reach the sensitivity to the effective neutrino mass|mββ|≈1 meV.With such a sensitivity,it is highly poss...