CXIX. The mean lifetime and frequency of production of charged V-particles

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Abstract
Data for the determination of the mean lifetime of charged V-particles are discussed, following the procedure outlined by Wilson and Butler (1952). The tracks of twenty-seven V ±-particles have now been photographed on the Pic-du-Midi (2 867 m) by Armenteros et al. (1952) and by the authors in a circular cloud chamber, 28 cm in diameter. It is shown that, using these data, the chamber is too small for the lifetime to be determined, but a lower limit of 1·0 × 10-10 sec is obtained. Furthermore, the relation between the frequency of production of energetic V ±-particles in penetrating showers of average energy (10–30) Bev, and various assumed lifetimes is discussed. Using recent photographic emulsion data on the frequency of particles of mass about 1200 me in the same type of penetrating shower an upper limit for the lifetime of 10-8 sec is obtained.

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