Table 1: Lower limits of the half-lives determined at the 90% CL in recent experiments along with upper limits of the effective neutrino mass, mββ, derived for various values of the nuclear matrix elements.

Experiment Isotope T1/20vββ (y) mββ (eV)
GERDA [57] 76Ge > 2.1 · 1025 < (0.2 – 0.4)
NEMO-3 [58] 100Mo > 1.1 · 1024 < (0.3 – 0.8)
CUORICINO [59] 130Te > 2.8 · 1024 < (0.30 – 0.71)
EXO-200 [60] 136Xe > 1.1 · 1025 < (0.19 – 0.45)
KamLAND-Zen [61] 136Xe > 1.9 · 1025 < (0.12 – 0.25) *

* Combined with the former result of the EXO-200 experiment [62].