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A new ultra-low-background spectrometer based on a HPGe detector with a sensitive volume of 600 cm 3 was developed to investigate rare nuclear processes, such as resonant neutrino-less double electron capture (0νEC/EC) and double beta decay processes (2ν2β, 2νβEC, 2νEC/EC) to the excited states of daughter nuclei. The spectrometer was installed at the Modane underground laboratory (LSM, France, 4800 m w.e.). Sensitivity of the spectrometer and its background were tested. A new method for the efficiency calibration in measurements of low-active samples was developed. A spectrometer was used for the measurements of low active materials and samples. Results obtained in 395 h investigation of resonant 0νEC/EC decay of Cd to the 2718 keV and 2741 keV excited states of Pd with ~23.2 g of enriched Cd, βEC, EC/EC decays of Ni in measurements of ~21.7 kg sample of natural nickel and 2ν2β decay of Mo sample with the mass of 2588 g to the 0 + , 1130 keV and 2 + , 539.5 keV excited states of 100 Ru are presented.

The Low-Background HPGE Γ-Spectrometer OBELIX for the Investigation of the Double Beta Decay to Excited States