No abstract

No abstract

Magnetostrictive spark chambers were used with a large-aperture magnet spectrometer to study the reaction .rr-p-+.rr-.rr+n at 5.0 GeV/c at Argonne National Laboratory. Differential cross sections for this reaction were measured in the region of low nucleon momentum transfer. Extrapolation techniques were used to obtain cross sections and phase shifts for the reaction x-.rr++n-.rr+ in the region of dipion mass less than 0.7 GeV. Effects of the interference between the strong .rr-?r+ amplitude and the Coulomb amplitude off the mass shell were investigated and were found to be small.

We present the differential cross section for proton-proton bremsstrahlung at an incident beam momentum of 1.38 GeV/c (730 MeV). The measurements are made with an overconstrained detection system to reliably exclude all pp~pp7r events. We have obtained differential cross sections at 16 photon angles at photon energies up to 200 MeV for protons scattered at SO (lab). For each of the photon angles, d 0 / d Qp d Ay de decreases smoothly with increasing photon energy up to E~(lab) 80 MeV. Above this photon energy the cross sections rise again. Our results are compared with the soft photon approximation and the external emission dominance calculations. The soft photog, approximation describes most spectra fairly well up to E~=100 MeV and external emission dominance up to E~6 0 MeV (lab}, but both predict cross sections which are too smal1 at the highest photon energies. NUCLEAH BEACTIONS Proton-proton bremsstrahlung, E= 730 MeV; rneasured 0 (8,E~); compared with soft-photon calculations.