  We examine time reversal invariance in the beta-decays of 8B(2+) and 8Li(2+)
to 8Be(2+) in detail, with particular attention to final state interactions of
the two alpha particles from the decay of 8Be, and of the electron (positron)
with the daughter nucleus. A R-matrix formulation is used, with the initial
state described by a shell model. The R-matrix parameters are obtained by
fitting the alpha-\alpha scattering phase shifts and allowed beta-decay rates.
Because the nuclear final state interaction effects on the time reversal test
come from second forbidden beta-decays, they are small and can be minimized by
a suitable choice of kinematic conditions. The e(+/-)-nucleus Coulomb
interaction induced T-violation effects depend on the first forbidden
operators.
