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  • Access by Xinjiang University

The Scattering and Absorption of π+ Mesons by Aluminum

James F. Tracy

  • Radiation Laboratory, Department of Physics, University of California, Berkeley, California

Phys. Rev. 91, 960 – Published 15 August, 1953

DOI: https://doi.org/10.1103/PhysRev.91.960

Abstract

The interaction of π+ mesons with aluminum has been studied in a magnet cloud chamber containing five 18-inch aluminum plates. Meson energies ranged from 25 to 100 Mev. 20 stops, 34 scatters ≥30°, and 57 stars were observed. A 1-prong star and a 70-Mev electron-positron pair in coincidence was interpreted as an inelastic charge-exchange scatter. All stops are reasonably accounted for by scatters and stars hidden by the geometry. The cross sections rise steeply with energy. The scattering (elastic plus inelastic) is very roughly isotropic except for a dip in the 60° to 90° interval Corrected absolute cross sections for the 25-45-, 47-70-, and 70-100-Mev intervals, respectively, are σ(scat), 70±23, 312±74, and 216±82 mb; σ(star), 176±34, 299±62, and 332±100 mb; and σ(total), 246±43, 611±95, and 548±129 mb. Detailed results and a description of experimental procedures are given.

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