Search for neutrinoless double-βdecay inXe136with a time projection chamber

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Abstract

A xenon time projection chamber (TPC) with an active volume of 180 liters has been built to study neutrinoless double-$\ensuremath{\beta}$ decay in $^{136}\mathrm{Xe}$. The experiment was performed in the Gotthard Underground Laboratory, with 5 atm of xenon enriched to 62.5% in $^{136}\mathrm{Xe}$. The experimental details, background considerations, detector performance, and data analysis are discussed. From 6830 h of data, no evidence has been found for the $0\ensuremath{\nu}{0}^{+}\ensuremath{\rightarrow}{0}^{+}$ transition. Half-life limits of ${T}_{\frac{1}{2}}^{0\ensuremath{\nu}}>3.4(6.4)\ifmmode\times\else\texttimes\fi{}{10}^{23}$ yr in the mass mechanism mode, and ${T}_{\frac{1}{2}}^{0\ensuremath{\nu}}>2.6(4.9)\ifmmode\times\else\texttimes\fi{}{10}^{23}$ yr in the right-handed currents mode, at the 90(68)% C.L., were derived, corresponding to an upper limit on the Majorana neutrino mass parameter $〈{m}_{\ensuremath{\nu}}〉$ of about 2.8 eV. Limits on two-neutrino double-$\ensuremath{\beta}$ decay of ${T}_{\frac{1}{2}}^{2\ensuremath{\nu}}>2.1\ifmmode\times\else\texttimes\fi{}{10}^{20}$ yr, and on neutrinoless double-$\ensuremath{\beta}$ decay with Majoron emission of ${T}_{\frac{1}{2}}^{0\ensuremath{\nu}\ensuremath{\chi}}>4.9\ifmmode\times\else\texttimes\fi{}{10}^{21}$ yr, both at 90% C.L., were also derived. Accordingly, a limit on the effective Majoron-neutrino coupling parameter of $〈{g}_{M}〉<2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ was deduced.

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