First Direct Double-Beta Decay Q-value Measurement of 82Se in Support of Understanding the Nature of the Neutrino

Abstract

In anticipation of results from current and future double-beta decay studies, we report a measurement resulting in a 82Se double-beta decay Q-value of 2997.9(3) keV, an order of magnitude more precise than the currently accepted value. We also present preliminary results of a calculation of the 82Se neutrinoless double-beta decay nuclear matrix element that corrects in part for the small size of the shell model single-particle space. The results of this work are important for designing next generation double-beta decay experiments and for the theoretical interpretations of their observations.

5 pages, 2 figures, accepted for publication in Physical Review Letters

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• Final Result on the Neutrinoless Double Beta Decay of ${}^{82}$Se with CUPID-0
• First search for Lorentz violation in double beta decay with scintillating calorimeters
• Perspectives on testing fundamental physics with highly charged ions in Penning traps
• Search for Majoron-like particles with CUPID-0
• Background identification in cryogenic calorimeters through $\alpha -\alpha$ delayed coincidences
• Measurement of ${}^{216}$Po half-life with the CUPID-0 experiment
• Direct determination of the ${}^{138}$La $\beta$-decay $Q$ value using Penning trap mass spectrometry
• A high-resolution CMOS imaging detector for the search of neutrinoless double $\beta$ decay in ${}^{82}$Se
• Investigation of the Lorentz invariance violation in two-neutrino double-beta decay
• Deformed shell model results for neutrinoless double beta decay of nuclei in A=60-90 region
• Results on ${}^{82}$Se $2\nu \beta \beta$ with CUPID-0 Phase I
• Exchange contribution to the variance of the excitation energy of the electron shell of the daughter atom in double-$\beta$ decay
• Search for Sterile Neutrinos with CUPID-0