Updated evaluation of potential ultra-low Q value $\beta$-decay candidates

Abstract

"Ultra-low" Q value $\beta$ decays are referred to as such due to their low decay energies of less than $\sim$1 keV. Such a low energy decay is possible when the parent nucleus decays into an excited state in the daughter, with an energy close to that of the Q value. These decays are of interest as potential new candidates for neutrino mass determination experiments and as a testing ground for studies of atomic interference effects in the nuclear decay process. In this paper, we provide an updated evaluation of atomic mass data and nuclear energy level data to identify potential ultra-low Q value $\beta$ decay candidates. For many of these candidates, more precise and accurate atomic mass data is needed to determine if the Q value of the potential ultra-low decay branch is energetically allowed and in fact ultra-low. The precise atomic mass measurements can be achieved via Penning trap mass spectrometry.

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• Identification of a potential ultra-low Q value electron capture decay branch in ${}^{75}$Se via a precise Penning trap measurement of the mass of ${}^{75}$As

Cited by in corpus (5)

• ${\beta }^{-}$ decay $Q$-value measurement of ${}^{136}$Cs and its implications to neutrino studies
• Atomic corrections for the unique first forbidden $\beta$ transition of ${}^{187}$Re
• Precise Mass Measurements of $A=133$ Isobars with the Canadian Penning Trap: Resolving the $Q_{{\beta }^{-}}$ anomaly at ${}^{133}$Te
• High-precision direct decay energy measurements of the electron-capture decay of ${}^{97}$Tc
• Ultra-low $Q_{\beta }$ value for the allowed decay of ${}^{110}$Ag${}^m$ confirmed via mass measurements