Abstract

This article describes the design and operation of an array of cylindrical spark chambers mounted in a 15.8 kG magnetic field. The array provided momentum analysis of charged prongs and γ-ray detection over approximately 2π steradian. A system of conical mirrors permitted photography of the sparks through small holes in the pole-pieces of the magnet. The equipment was operated in an unseparated beam of π − and K − particles of momentum 7.7 GeV/ c with a neutral-link trigger requirement which permitted observation of neutral V-particles.

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