Time-reversal invariance in the beta-decay of RaE

The question of the possible violation of time-reversal invariance in RaE beta decay has been reinvestigated. The²-analysis of the available experimental data on spectrum shape together with the longitudinal polarization of beta electrons lead to an upper limit of 2° for the relative phase of the vector and axial vector coupling constants which is a lower value than that given in some previous papers.