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The interaction potential between hydrogen and antihydrogen is obtained by a variational calculation. A potential maximum is found, but its peak is below the dissociation limit. A classical calculation shows that the cross section for total annihilation decreases monotonically from 31a₀² at 0.01 eV to 4a₀² at 20 eV.
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Junker et al. (1972) studied this question.
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