ENERGY DEPENDENCE OF PROTON-ALPHA BREMSSTRAHLUNG

Abstract

Publisher Summary This chapter discusses the energy dependence of proton–alpha (p–α) bremsstrahlung. Bremsstrahlung in proton–alpha scattering was measured for incident proton energies of 22 MeV and 45 MeV at the UCLA Cyclotron Laboratory. The chapter also describes an experiment in which the final state proton and alpha, but not the photon, is detected. A. M. Green derived theoretical p–α bremsstrahlung cross-sections in which off-energy shell proton–nucleus transition matrices are expanded about their on-shell values at the initial and final energies, the expansion parameter being the ratio of the average photon energy to twice the final and initial relative energies. The chapter illustrates the energy dependence of p–α bremsstrahlung at 70°–30°. A. M. Green, while discussing the Zurich data, attributed this to the presence of the lithium ground state resonance in the region of final state energies. The second order terms contain a part of the single scattering graphs and not just the re-scattering.