Abstract
Magnetic moments of a proton and a neutron are calculated in the QCD sum rule approach. The substantial role of the external electromagnetic field induced vacuum expectation values, the most important of which is connected with quark condensate magnetic susceptibility, is demonstrated. The results are μ p = 3.0, μ n = −2.0(±105) which is in perfect agreement with experiment. The invariant amplitudes of the Δ →p γ transition are also calculated.
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