A new investigation on the spontaneous decay of mesons is performed by counting delayed coincidences between the impinging low energy mesons and the decay electrons. Four points of the decay curve of mesons are obtained for relative delay times ranging between -0.91 and 2.43 {μ}sec. The results give an exponential curve which is evidence of the decay process. For the mean life we find τ=2.33 μsec.±6.5 percent. The effect disappears completely by inverting the sign of the delay.
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Conversi et al. (1946) studied this question.