PHOTOPRODUCTION OF NEUTRAL PIONS IN HYDROGEN AND DEUTERIUM

Abstract

production. By a method of Placzek and Wick the corrections to the simple theory are estimated, and found to be large near threshold. These corrections may explain the discrepancy between the theory and the experimental results. No information about the nuclear-pair correlation function is obtained. The impulse approximation is used to calculate the relative ratio of the radiative absorption rate of pi /sup -/ mesons absorbed in hydrogen and deuterium from an atomic s state. The calculated value of the ratio T = R( pi /sup -/ + d yields 2n + gamma )/R( pi /sup -/ + p yields n + gamma ) is 0.83 plus or minus 0.08. The experimental value is 0.41 plus or minus 0.06. The closure approximation is used to evaluate T. By a method due to Placzek the error due to the closure approximation is shown to be small. (auth)

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