Mesons produced by the high energy photon beam from the University of California Radiation Laboratory 330 Mev synchrotron are found to show an excess of negatives over positives. (1) With a carbon target, observing mesons in the energy range 30-130 Mev at 90° to the photon beam, the ratio of negative to positive mesons is 1.7 ± 0.2 with no significant energy dependence.
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Brueckner et al. (1949) studied this question.