A calculation of the cross section for the reaction vγ → vμ~+μ~-, which is induced by the neutrinomagnetic moment, is described in detail. The expression obtained for this cross section is used to determine the asymptotic behavior of the cross section for the reaction vN →vNμ~+μ~- by the Weiszacker-Williams method. It is shown that, upon going over from the nucleus involved to a structureless particle (for example, an electron), the resulting expression is doubled owing to integration with respect to the virtual-photon momentum over the region m_μ Q E_v, where the Weiszacker-Williams approximation is not applicable. The method developed here makes it possible to obtain straightforwardly the known asymptotic expressions for the cross sections describing the reactions eN → eNμ~+μ~- and e~+e~- → W~+W~-e~+e~-.
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