  A classical calculation, modified by Compton-recoil kinematics, of the
radiation emitted by a relativistic neutrino with mass and a magnetic moment
passing through a transverse magnetic field. The calculation is performed in
the neutrinos rest frame by the method of virtual quanta. The total number N of
virtual quanta scattered by the neutrino is determined. The semi-classical
result for the analog of the Klein-Nishina formula is compared with a QED
calculation of the photon scattering cross section. The different angular
distributions, both strongly peaked, lead to a factor of two difference between
the QED and semi-classical results for N.

High Energy Physics - Phenomenology