Abstract
The Yukawa interaction between nucleon and antinucleon is investigated in the intermediate energy range (50 to 200 Mev) where it is shown that the details of the short-range forces are unimportant; that is, cross sections are primarily determined by the pion exchange potential for distances greater than ${10}^{\ensuremath{-}13}$ cm. Numerical calculations by the WKB method, using two possible forms of the potential, give nucleon-antinucleon cross sections several times larger than the nucleon-nucleon cross sections at corresponding energies. This large difference is due to systematic cancellation effects in the nucleon-nucleon interaction which are removed in the nucleon-antinucleon system. It is shown that irregularities in the annihilation cross section as a function of energy are to be expected as a result of the sudden onset of individual partial waves.
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