Positive pions were stopped in a water Cherenkov counter and the time distribution of the positrons from π⁺→μ⁺→e⁺ was measured. The μ⁺ mean life obtained, 2.196 95±{}0.000 06 {μ}s, is slightly less than previous results.
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Giovanetti et al. (1984) studied this question.
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