2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41613We 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.High Energy Physics - Phenomenologytext