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The mean life of positrons was measured in superconducting lead and tin. Consistent results were obtained with the lead sample giving an average value for the mean life of (0.57±0.07)X10~9 sec. A null result was obtained with tin; the measured value of the lifetime was (0.15 ±0.09) X 10~~9 sec, as compared with the room temperature value of 0.15X10" 9 sec. The data indicate that the lifetime change in lead is a superconductive phenomenon and not due simply to the low temperature of the sample. Conjectures are made to explain the different results obtained with lead and tin.

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