Abstract
Spectra of protons and alpha-particles, emitted from the giant electric dipole resonance of 28 Si excited by quasi-monochromatic photons from in-flight annihilation of accelerated positrons, were measured. Cross sections for six charged-particle decay channels were extracted in the energy region from 16.8 to 25.7 MeV. While the ( γ , α 0 ) cross section is completely statistical in nature, the (γ, p) process was found to have a 65% semidirect component, mainly in the ( γ , p 0 ) and ( γ , p 1+2 ) channels.
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