Large solid angle momentum-analyzing spark chamber system

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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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This work was supported in part through funds provided by the U. S. Atomic Energy Commission under Contract AT(30-1)-2098.

Present address: Lawrence Radiation Laboratory, University of California, Berkeley, California.

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Present address: Argonne National Laboratory, Argonne, Illinois.

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