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Evidence for the Production of Neutral Mesons by Photons
Phys. Rev. 78, 802 – Published 15 June, 1950
DOI: https://doi.org/10.1103/PhysRev.78.802
Abstract
In the bombardment of nuclei by 330-Mev x-rays, multiple gamma-rays are emitted. From their angular correlation it is deduced that they are emitted in pairs in the disintegration of neutral particles moving with relativistic velocities and therefore of intermediate mass. The neutral mesons are produced with cross sections similar to those for the charged mesons and with an angular distribution peaked more in the forward direction. The production cross section in hydrogen and the production cross section per nucleon in C and Be are comparable.
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