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The first direct determination of the ground-state-to-ground-state $Q$ valuesof the $\beta^-$ decay $^{76}$As $\rightarrow$ $^{76}$Se and theelectron-capture decay $^{155}$Tb $\rightarrow$ $^{155}$Gd was performedutilizing the double Penning trap mass spectrometer JYFLTRAP. By measuring theatomic mass difference of the decay pairs via the phase-imagingion-cyclotron-resonance (PI-ICR) technique, the $Q$ values of $^{76}$As$\rightarrow$ $^{76}$Se and $^{155}$Tb $\rightarrow$ $^{155}$Gd were determinedto be 2959.265(74) keV and 814.94(18) keV, respectively. The precision wasincreased relative to earlier measurements by factors of 12 and 57,respectively. The new $Q$ values are 1.33 keV and 5 keV lower compared to thevalues adopted in the most recent Atomic Mass Evaluation 2020. With the newlydetermined ground-state-to-ground-state $Q$ values combined with the excitationenergy from $\gamma$-ray spectroscopy, the $Q$ values forground-state-to-excited-state transitions $^{76}$As (ground state)$\rightarrow$ $^{76}$Se$^*$ (2968.4(7) keV) and $^{155}$Tb (ground state)$\rightarrow$ $^{155}$Gd$^*$ (815.731(3) keV) were derived to be -9.13(70) keVand -0.79(18) keV. Thus we have confirmed that both of the $\beta^{-}$-decayand EC-decay candidate transitions are energetically forbidden at a level of atleast 4$\sigma$, thus definitely excluding these two cases from the list ofpotential candidates for the search of low-$Q$-value $\beta^-$ or EC decays todetermine the electron-(anti)neutrino mass.

physical review. c

Direct determination of the atomic mass difference of the pairs  $^{76}$As-$^{76}$Se and $^{155}$Tb-$^{155}$Gd rules out $^{76}$As and  $^{155}$Tb as possible candidates for electron (anti)neutrino mass  measurements