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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)× 10 - 9 sec. A null result was obtained with tin; the measured value of the lifetime was (0.15±0.09)× 10 - 9 sec, as compared with the room temperature value of 0.15× 10 - 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.
Physical Review – American Physical Society (APS)
Published: Nov 15, 1954
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