Final results of the Aurora experiment to study 2β decay of Cd116 with enriched Cd116WO4 crystal scintillators

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Abstract

The double-beta decay of $^{116}\mathrm{Cd}$ has been investigated with the help of radiopure enriched $^{116}\mathrm{Cd}{\mathrm{WO}}_{4}$ crystal scintillators (mass of 1.162 kg) at the Gran Sasso underground laboratory. The half-life of $^{116}\mathrm{Cd}$ relative to the $2\ensuremath{\nu}2\ensuremath{\beta}$ decay to the ground state of $^{116}\mathrm{Sn}$ was measured with the highest up-to-date accuracy as ${T}_{1/2}=(2.6{3}_{\ensuremath{-}0.12}^{+0.11})\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{yr}$. A new improved limit on the $0\ensuremath{\nu}2\ensuremath{\beta}$ decay of $^{116}\mathrm{Cd}$ to the ground state of $^{116}\mathrm{Sn}$ was set as ${T}_{1/2}\ensuremath{\ge}2.2\ifmmode\times\else\texttimes\fi{}{10}^{23}\text{ }\text{ }\mathrm{yr}$ at 90% C.L., which is the most stringent known restriction for this isotope. It corresponds to the effective Majorana neutrino mass limit in the range $⟨{m}_{\ensuremath{\nu}}⟩\ensuremath{\le}(1.0--1.7)\text{ }\text{ }\mathrm{eV}$, depending on the nuclear matrix elements used in the estimations. New improved half-life limits for the $0\ensuremath{\nu}2\ensuremath{\beta}$ decay with majoron(s) emission, Lorentz-violating $2\ensuremath{\nu}2\ensuremath{\beta}$ decay, and $2\ensuremath{\beta}$ transitions to excited states of $^{116}\mathrm{Sn}$ were set at the level of ${T}_{1/2}\ensuremath{\ge}{10}^{20}--{10}^{22}\text{ }\text{ }\mathrm{yr}$. New limits for the hypothetical lepton-number violating parameters (right-handed currents admixtures in weak interaction, the effective majoron-neutrino coupling constants, R-parity violating parameter, Lorentz-violating parameter, heavy neutrino mass) were set.

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