The ${\pi }^{\mathrm{-}}$/${\pi }^{+}$ yield ratio in 1.05 GeV/nucleon ${}_{}{}^{40}{}_{}{}^{}$Ca${+}^{40}$Ca interactions was measured using a magnetic spectrometer system. The ratio was found to be unity over the entire range of measurements covering ${\theta }_{\mathrm{lab}=10\mathrm{}}$°, 20°, 25°, 30°, 65°, and 90° and laboratory momenta 100≤$p_{\mathrm{lab}\mathrm{\le }350}$ MeV/c. The ratios exhibit no visible effect of Coulomb forces from the nuclear charge distributions.

• Received 16 October 1989

DOI:https://doi.org/10.1103/PhysRevC.41.147