Shell model calculations find NLO contributions to 2νββ half-lives to excited states typically below 5% but larger when leading-order terms cancel, yielding half-life predictions slightly above the 76Ge limit and consistent with recent 82Se indications.
The search for neutrinoless double-beta decay
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NEXT-100 measures internal Rn-222 activity at 0.95 Bq/m³ with no Rn-220 detected, yielding a Bi-214 rate of 0.97 Hz above 400 keV and a background index of ~4×10^{-5} counts/(keV·kg·yr) in the 0νββ ROI after topological selection.
Electroluminescence yield measurements in xenon reveal a modest 5% change in the slope of the reduced yield Y/p above 5 bar pressure.
citing papers explorer
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Two-neutrino $\beta\beta$ decay to excited states at next-to-leading order
Shell model calculations find NLO contributions to 2νββ half-lives to excited states typically below 5% but larger when leading-order terms cancel, yielding half-life predictions slightly above the 76Ge limit and consistent with recent 82Se indications.
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Radon-induced backgrounds in the NEXT-100 experiment
NEXT-100 measures internal Rn-222 activity at 0.95 Bq/m³ with no Rn-220 detected, yielding a Bi-214 rate of 0.97 Hz above 400 keV and a background index of ~4×10^{-5} counts/(keV·kg·yr) in the 0νββ ROI after topological selection.
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Electroluminescence Yield Measurements in Xenon Gas with the NEXT-DEMO++ Detector
Electroluminescence yield measurements in xenon reveal a modest 5% change in the slope of the reduced yield Y/p above 5 bar pressure.