Measurement of the Positiveπ-Meson Lifetime

Abstract

The time intervals between the succession of events: stopping of a ${\pi }^{+}$ meson in a stilbene crystal, $\pi \to \mu$ decay and $\mu \to {\beta }^{+}$ decay are used to identify the pulses produced by ${\pi }^{+}$ mesons and to measure the mean life of the ${\pi }^{+}\to \mu$-decay. For this mean life we find (2.58±0.14) × ${10}^{-8\mathrm{}}$ sec.