Branching ratios for theC12(γ,p) reaction at an excitation energy of 28 MeV

Abstract
Photoparticle spectra from the (γ12,pi) and (γ12,α0) reactions have been measured in an angular aperture (FWHM) of 60° centered around 90°, using 28 MeV quasimonochromatic photons from annihilation-in-flight of positrons. The branching ratio for the (γ,α0) to (γ,p0) transition amounts to (2.9±1.2)%, while the (γ,pi) branching to excited states in B11 contributes (24±2)% to the observed (γ,p) cross section.

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