$Q$-value and half-lives for the double-$\beta$-decay nuclide $^{110}$Pd

The $^{110}$Pd $\beta\beta$- decay ${Q}$-value was measured with the Penning-trap mass spectrometer ISOLTRAP to be ${Q}$ = 2017.85(64) keV. This value shifted by 14 keV compared to the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay modes. In addition a new set of the relevant matrix elements has been calculated. The expected half-life of the two-neutrino mode was reevaluated as 1.5(6) $\times$10$^{20}$ yr. With its high natural abundance, the new results reveal $^{110}$Pd to be an excellent candidate for double-$\beta$ -decay studies.