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A study of the photo-disintegration of the deuteron using a cloud chamber as a detector has been made for gamma-ray energies of 6.14 and 7.00 Mev from the F(p,α)O16* reaction. By observing the number of photo-disintegration protons and the number of electron pairs formed in the gas (CD₄) of the cloud chamber, the ratio of the photo-disintegration cross section to the pair cross section is obtained. Assuming a calculated value for the pair cross section these data yield σ[D(γ,p)n]=25.7(14 percentP.E.)×10^-28 cm² at an average gamma-ray energy of 6.55 Mev.A plot of the angular distribution of the photo-disintegration protons agrees, within statistical limits, with sin²θ, though there may be a slight asymmetry in the forward direction.
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Phillips et al. (1950) studied this question.
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