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

Abstract

A search for double beta processes in 190Pt and 198Pt was realized with the help of ultra-low background HP Ge 468 cm^3 gamma spectrometer in the underground Gran Sasso National Laboratories of the INFN (Italy). After 1815 h of data taking with 42.5 g platinum sample, T_{1/2} limits on 2beta processes in 190Pt (εβ^+ and 2ε) have been established on the level of 10^{14}-10^{16} yr, 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 \times 10^{16} yr at 90% C.L. In addition, T_{1/2} limit on 2 beta^- decay of 198Pt (2ν+0ν) to the 2^+_1 excited level of 198Hg has been set at the first time: T_{1/2}>3.5 \times 10^{18} yr. The radiopurity level of the used platinum sample is reported.

13 pages, 6 figures, 2 tables

References in corpus (7)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Precise half-life values for two neutrino double beta decay
• Resonance enhancement of neutrinoless double electron capture
• Search for ${\beta }^{+}$EC and ECEC processes in ${}^{112}$Sn and ${\beta }^{-}{\beta }^{-}$ decay of ${}^{124}$Sn to the excited states of ${}^{124}$Te
• First observation of alpha decay of 190-Pt to the first excited level (E_{exc}=137.2 keV) of 186-Os
• A search for various double beta decay modes of tin isotopes
• New limits on the ${\beta }^{+}$EC and ECEC processes in ${}^{120}$Te

Cited by in corpus (13)

• Theory of neutrinoless double beta decay
• Neutrinoless double beta decay and neutrino mass
• Dark Matter investigation by DAMA at Gran Sasso
• Neutrinoless Double-Electron Capture
• First observation of alpha decay of 190-Pt to the first excited level (E_{exc}=137.2 keV) of 186-Os
• Neutrinoless double electron capture
• Evaluation of the resonance enhancement effect in neutrinoless double-electron capture in 152Gd, 164Er and 180W atoms
• Transition Operators Entering Neutrinoles Double Electron Capture to Excited Nuclear States
• DAMA/LIBRA results and perspectives, Bled 2013
• New limits on double-beta decay of ${}^{190}$Pt and ${}^{198}$Pt
• Searches for neutrinoless resonant double electron captures at LNGS
• First limits on double beta decays in ${}^{232}$Th
• Updated and novel limits on double beta decay and dark matter-induced processes in platinum