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We present a convergent frozen-correlation approximation (CFCA) to evaluate multiple-ionization cross sections in ion-atom collisions. The theory allows the evaluation of total cross sections for double ionization without dynamic correlation. We have studied double ionization of He by impact of high-energy protons and antiprotons. Our results for antiproton impact are in excellent agreement with experiment, thus proving the negligible role of dynamic correlation. However, a discrepancy is obtained for proton impact, which suggests that dynamic correlation may play a significant role in this case.
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Dı́az et al. (2000) studied this question.
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