Study of theK+Decay Probability

Abstract

We have measured the mean life of the $K^{+}$ meson with particular attention paid to whether the decay obeys the exponential law. We find no evidence for nonexponential decay. The data give a ${\chi }^2$ of 365 with 379 degrees of freedom when fitted to a pure exponential between 2.5 and 7.3 mean lives from production. The mean life is found to be 12.443±0.038 nsec.