Review of modern double beta decay experiments

The review of modern experiments on search and studying of double beta decay processes is done. Results of the most sensitive current experiments are discussed. The main attention is paid to EXO-200, KamLAND-Zen, GERDA-I and CUORE-0 experiments. Modern values of T_1/2(2ν) and best present limits on neutrinoless double beta decay and double beta decay with Majoron emission are presented. Conservative limits on effective mass of a Majorana neutrino (〈m_ν〉 < 0.46 eV) and a coupling constant of Majoron to neutrino (〈g_ee〉 < 1.3 · 10⁻⁵) are obtained. Prospects of search for neutrinoless double beta decay in new experiments with sensitivity to 〈m_ν〉 at the level of ∼ 0.01-0.1 eV are discussed