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The cross-section and angular distributions of protons from the D-D reaction using thin gas targets have been measured from 55 to 430 keV. The results have been expressed in the form σ θ = ( σ /4 π (1+⅓ A +1/5 B )) (1+ A cos 2 θ + B cos 4 θ). The variation of the total cross-section σ and the asymmetry coefficients A and B over the energy range 15 to 190 keV can be described by the theory of Beiduk, Pruett & Konopinski introducing only a small or negligible amount of spin-orbit coupling. The ratio of the number of 3 He’s to 3 H’s has been measured up to 250 keV at a few angles in the forward direction only, and found to be unity within experimental error.

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