The magnitude of the Coulomb mixing parameter delta (l)(IM) has been experi
mentally deduced, for the first time, for the B decay of Rb-74. Th, estimat
ed magnitude is derived from the feeding of the non-analog first excited 0(
+) state in Kr-74. The inferred upper Limit of 0.07% is small compared to t
heoretical predictions. The half-life was measured to be 64.90(9) ms. (C) 2
001 Published by Elsevier Science B,V.