Electromagnetic simulation of t violation in beta decay

β-decay correlation terms of the form J•pe×pν can arise, insofar as time-reversal invariance is valid, only from the influence of final-state electromagnetic interactions. For allowed transitions governed by V, A couplings, the effects are recoil-dependent. They are computed here, to lowest relevant recoil and electro-magnetic orders, for the special class of spin-1/2 mirror transitions, of which the decay process Ne19→F19+e++ν is an example. On the conserved-vector-current hypothesis, the correlation effect in question is seen to be dominated by the phenomenon of weak magnetism.