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New limits on double-beta decay of 190 Pt and 198 Pt

A search for double-beta decay of 190 Pt and 198 Pt with emission of γ -ray quanta was realized at the HADES underground laboratory with a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition of the platinum sample has been measured with high precision using inductively coupled plasma mass spectrometry. New lower limits for the half-lives of 190 Pt relative to different channels and modes of the decays were set on the level of lim T 1 / 2 ∼ 10 14 –10 16 year. A possible exact resonant 0 ν K N transition to the 1,2 1326.9 keV level of 190 Os is limited for the ﬁrst time as T 1 / 2 ≥ 2 . 5 × 10 16 year. A new lower limit on the double-beta decay of 198 Pt