Search for neutrinoless quadruple beta decay of ${}^{136}$Xe in XMASS-I

Abstract

A search for the neutrinoless quadruple beta decay of ${}^{136}$Xe was conducted with the liquid-xenon detector XMASS-I using $327\mathrm{kg}\times 800.0\mathrm{days}$ of the exposure. The pulse shape discrimination based on the scintillation decay time constant which distinguishes $\gamma$-rays including the signal and $\beta$-rays was used to enhance the search sensitivity. No significant signal excess was observed from the energy spectrum fitting with precise background evaluation, and we set a lower limit of the half life of 3.7 $\times$ 10${}^{24}$ years at 90$\%$ confidence level. This is the first experimental constraint of the neutrinoless quadruple beta decay of ${}^{136}$Xe.

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