Corrections to the Fermi Matrix Element for Superallowed <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math></span> Decay

W. E. Ormand; B. A. Brown

doi:10.1103/PhysRevLett.62.866

Corrections to the Fermi Matrix Element for Superallowed $β$ Decay

W. E. Ormand and B. A. Brown

Phys. Rev. Lett. 62, 866 – Published 20 February 1989; Erratum Phys. Rev. Lett. 63, 103 (1989)

Abstract

Corrections to the Fermi matrix element for superallowed transitions due to isospin nonconservation are reexamined. The sources of theoretical uncertainty and the possibility of a previously neglected correction based on the mismatch between the spectator nucleons are investigated. The consequences to the conserved-vector-current hypothesis and the Kobayashi-Maskawa mixing angles are discussed.