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The nuclear impulses were studied for electron pairs produced in an air-filled cloud chamber by the continuous spectrum of x-rays from a 22-Mev betatron. Less than one-third of the momentum transfers to the nucleus were found to consist of values less than mc. The probability Φ(Pₙ) of a momentum transfer Pₙ was found to decrease rapidly with decreasing Pₙ for Pₙ<mc.
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Modesitt et al. (1950) studied this question.
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