Free positrons from electron-positron pairs produced by 33-TeV Pb⁸²⁺ ions in Coulomb collisions with targets of carbon [(CH)ₓ], aluminum, palladium, and gold have been measured to determine cross sections and momentum distributions. Upper limits have been established for contributions from multiple pair formation. Comparison with similar data taken for 6.4-TeV S¹⁶⁺ ions shows that cross sections scale as the product of the squares of the projectile and target nuclear charges. Positron momentum distributions for S¹⁶⁺ and Pb⁸²⁺ ions on all targets are observed to be similar, but indicate a tendency for higher-energy positron emission for the Pb⁸²⁺ projectiles.
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Vane et al. (1997) studied this question.
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