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First search for double- \( \beta\) decay of platinum by ultra-low background HP Ge \( \gamma\) spectrometry

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Abstract

A search for double-\( \beta\) processes in 190Pt and 198Pt was realized with the help of ultra-low background HP Ge 468cm^3 \( \gamma\) spectrometer in the underground Gran Sasso National Laboratories of the INFN (Italy). After 1815 h of data taking with 42.5g platinum sample, T 1/2 limits on 2\( \beta\) processes in 190Pt ( \( \varepsilon\) \( \beta^{+}_{}\) and 2\( \varepsilon\) have been established on the level of 1014-1016y, 3 to 4 orders of magnitude higher than those known previously. In particular, a possible resonant double-electron capture in 190Pt was restricted on the level of 2.9×1016 y at 90% C.L. In addition, T 1/2 limit on 2\( \beta^{-}_{}\) decay of 198Pt (2\( \nu\) +0\( \nu\)) to the 2+ 1 excited level of 198Hg has been set at the first time: T 1/2 > 3.5×1018 y. The radiopurity level of the used platinum sample is reported.

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Correspondence to R. Bernabei.

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Communicated by E. Bellotti

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Belli, P., Bernabei, R., Cappella, F. et al. First search for double- \( \beta\) decay of platinum by ultra-low background HP Ge \( \gamma\) spectrometry. Eur. Phys. J. A 47, 91 (2011). https://doi.org/10.1140/epja/i2011-11091-6

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