The mean lifetime of the neutral π-meson has been determined by measurements on the ‘direct’ electron pairs associated with nuclear disintegrations and due to an alternative mode of decay, viz. π0 → hv + β+ + β-. The most probable value is 5 x 10-15 s. The ratio of the probability of this alternative mode of decay to that in which the meson transforms into two photons is 0⋅013 ± 0⋅004.
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B. M. Anand (1953) studied this question.
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