We report the background-free observation of atomic antihydrogen, produced by interactions of an antiproton beam with a hydrogen gas jet target in the Fermilab Antiproton Accumulator. We measure the cross section of the reaction p̄p→H̄e^-p for p̄ beam momenta between 5203 and 6232 MeV/ c to be 1.12±0.14±0.09 pb.
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Blanford et al. (1998) studied this question.
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