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The 90° yields of ?-rays from the reaction 27Al(p,?)28Si have been obtained at intervals of 40 keV for proton energies between 8·02 and 10·42 MeV. The ground state y-ray (?o) and the first excited state y-ray (?l) were adequately resolved. The two yield curves show considerable structure and, with the present resolution, there is a strong one-way correspondence between them. The gross structure of the ?o yield curve is compared with data from the 28Si(?,n)27Si reaction and fair agreement is found.

The Photonuclear Giant Resonance in Silicon?28