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Isospin-breaking corrections to superallowed Fermi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>decay in isospin- and angular-momentum-projected nuclear density functional theory
Background: Superallowed $\ensuremath{\beta}$-decay rates provide stringent constraints on physics beyond the standard model of particle physics. To extract crucial information about the electroweak force, small isospin-breaking corrections to the Fermi matrix element of superallowed transitions must be applied.Purpose: We perform systematic calculations of isospin-breaking corrections to superallowed $\ensuremath{\beta}$ decays and …