A search was made for pairs produced in the collision of heavy particles by bombarding tantalum with protons of energy up to 1.64 Mev. Only a very small number of positrons was detected, giving an upper limit of 6×{}10^-13 pair per proton at 1.54 Mev, in contrast to the theoretical value of 38×{}10^-13 pair per proton obtained by Born approximation.
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Stephens et al. (1958) studied this question.
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