Nuclear pion single charge exchange has been studied using a method of ${\pi }^0$ detection based on the spectroscopy of the band-angle decay $\gamma$ ray. For incident 100-MeV positive pions, charge-exchange scattering from nuclei ranging from Be to Pb was studied. For all targets the ${\pi }^0$ spectra were broad, extending over the entire range 0-100 MeV. Data were taken at 40° and 120° and in all cases the data show a backward peaking. The yields vary about as $A^{\frac{2}{3}}$.

• Received 10 November 1977

DOI:https://doi.org/10.1103/PhysRevLett.40.97