Abstract
As recently measured in relativistic heavy-ion collisions, the antideuteron formation rate, which is the ratio of the antideuteron production cross section to the antiproton cross section squared at the same momentum per nucleon, is substantially smaller than the formation rate of deuterons. This happens because the shape of the antinucleon source is different from the nucleon one. In the case of baryon-rich sources, the nucleons are emitted from the whole source volume while antinucleons are emitted predominantly from the surface due to antinucleon absorption in the baryon environment.
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