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Nuclear Zemach moments and finite-size corrections to allowed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>decay
The finite-size correction to $\ensuremath{\beta}$ decay plays an important role in determining the expected antineutrino spectra from reactors at a level that is important for the reactor-neutrino anomaly. Here we express the leading-order finite-size correction to allowed $\ensuremath{\beta}$ decay in terms of Zemach moments. We calculate the Zemach moments within …