New limits on the ${\beta }^{+}$EC and ECEC processes in ${}^{120}$Te

Abstract

New limits on the double beta processes for ${}^{120}$Te have been obtained using a 400 cm${}^3$ HPGe detector and a source consisting of natural Te0${}_2$ powder. At a confidence level of 90% the limits are $0.19\times 10^{18}$ y for the ${\beta }^{+}$EC$(0\nu +2\nu )$ transition to the ground state, $0.75\times 10^{18}$ y for the ECEC$(0\nu +2\nu )$ transition to the first 2${}^{+}$ excited state of ${}^{120}$Sn (1171.26 keV) and $(0.19-0.6)\times 10^{18}$ y for different ECEC($0\nu$) captures to the ground state of ${}^{120}$Sn.

9 pages, 4 figures; v2: minor changes

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• Double beta decay: present status
• First search for double beta decay of platinum by ultra-low background HP Ge gamma spectrometry
• Search for beta plus/EC double beta decay of 120Te