Design and performance of an on-line wire spark chamber spectrometer for 5 to 30 GeV/c particles

Proton and Pion Spectra from Proton-Proton Interactions at 10, 20, and 30 BeV/c

“…The multiple-pion production may, for example, be a "bremsstrahlung-type" process as proposed by Lewis, Oppenheimer, and Wouthuysen 2 , and more recently modified by Kastrup, 3 to explain elastic proton-proton scattering. It was, in fact, this bremsstrahlung model that first suggested to us a relationship between the proton angle and the pion multiplicity.…”