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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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.