Projected sensitivity of the LUX-ZEPLIN experiment to the two-neutrino and neutrinoless double β decays of Xe134

Le résumé fourni par la source

The projected sensitivity of the LUX-ZEPLIN (LZ) experiment to two-neutrino and neutrinoless double $\ensuremath{\beta}$ decay of $^{134}\mathrm{Xe}$ is presented. LZ is a 10-tonne xenon time-projection chamber optimized for the detection of dark matter particles and is expected to start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass of natural xenon provides an exceptional opportunity to search for the double $\ensuremath{\beta}$ decay of $^{134}\mathrm{Xe}$, for which xenon detectors enriched in $^{136}\mathrm{Xe}$ are less effective. For the two-neutrino decay mode, LZ is predicted to exclude values of the half-life up to $1.7\ifmmode\times\else\texttimes\fi{}{10}^{24}$ years at 90% confidence level (CL) and has a three-sigma observation potential of $8.7\ifmmode\times\else\texttimes\fi{}{10}^{23}$ years, approaching the predictions of nuclear models. For the neutrinoless decay mode LZ, is projected to exclude values of the half-life up to $7.3\ifmmode\times\else\texttimes\fi{}{10}^{24}$ years at 90% CL.

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