Search for Relativistic Charge-23eQuarks in the Cosmic Radiation

Abstract

A multilayer liquid scintillation detector telescope of aperture 0.51 ${\mathrm{m}}^2$ sr combined with a flash-tube track detector has been used to search for relativistic charge-$\frac{2}{3}e$ quarks in the cosmic radiation. The results set an upper limit on the vertical intensity of such particles of 2.2×${10}^{-6\mathrm{}}$ ${\sec }^{-1\mathrm{}}$ ${\mathrm{m}}^{-2\mathrm{}}$ ${\mathrm{sr}}^{-1\mathrm{}}$ at a 90% confidence level.