As a member of KamLAND collaboration I participate in search for neutrinoless double beta decay. Observation of such extremely rare nuclear process will allow to establish the Majorana nature of neutrino, and help to determine the neutrino-mass hierarchy and estimate the effective Majorana mass of neutrino.

KamLAND-Zen is the world's most sensitive experiment (as of May 2016) to search for neutrinoless double beta decay. It uses liquid scintillator loaded with enriched xenon to study double beta decay of Xenon-136. My research efforts will be focused on improvements of the KamLAND-Zen sensitivity towards the inverted mass hierarchy region as well as other projects.