, Volume 16, Issue 3, pp 490-504

A new measurement of the mean life of the positive pion

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The mean life of the positive π-meson has been determined from about 8 000 πμ decay events recorded by photographing pulses on an oscilloscope. The pictures were measured with an instrument originally developed for the evaluation of bubble chamber pictures, and the data were analysed using a fast computer. The value obtained for the mean life of the π-meson is τπ=25.46±0.32 ns.


La vita media del mesone π+ è stata determinata da circa 8 000 decadimenti πμ fotografati su un oscillografo. Le fotografie sono state misurate con uno strumento destinato ad analisi di fotografie in camera a bolle ed i dati ottenuti sono stati elaborati su una calcolatrice elettronica rapida. Il valore ottenuto per la vita media del mesone π è τπ=(25.46±0.32) ns.