Proceedings of the XX International Scientific Conference of Young Scientists and Specialists (AYSS-2016)

Investigation of double beta decay processes to excited states of daughter nuclei was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using the high sensitivity spectrometer OBELIX in a common activity of JINR Dubna, IEAP CTU in Prague and LSM. The spectrometer is based on the HPGe detector with the sensitive volume of 600 cm3 and relative efficiency of 160%. Two experimental runs with a large
sample ( 21.7 kg) of nickel containing 68% of 58Ni were carried out at 2014 and 2015. At the same time, a new experimental run of searching for double beta decay of 106Cd was performed using the TGV-2 spectrometer, consisting of 32 planar type HPGe detectors with a total sensitive volume of 400 cm3. The current results obtained in the TGV-2 experiment with 106Cd and new experimental limits obtained in the measurement of 58Ni using the OBELIX spectrometer are presented.