Nuclear Disintegration in Magnetic Fields
  We employ the Weizsaecker-Williams method of virtual quanta to study disintegration of nuclei in magnetic field. We explore a variety of field configurations and conclude that for the energy range of interest for applications to cosmic rays (10^{18}-10^{21} eV) such disintegrations are not a significant source of energy or flux loss for any realistic acceleration mechanism. 
Lee C. Loveridge