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We discuss the problem of ultra high energy nuclei propagation inextragalactic background radiations. The present paper is the continuation ofthe accompanying paper I where we have presented three new analytic methods tocalculate the fluxes and spectra of ultra high energy cosmic ray nuclei, bothprimary and secondary, and secondary protons. The computation scheme in thispaper is based on the analytic solution of coupled kinetic equations, whichtakes into account the continuous energy losses due to the expansion of theuniverse and pair-production, together with photo-disintegration of nuclei.This method includes in the most natural way the production of secondary nucleiin the process of photo-disintegration of the primary nuclei during theirpropagation through extragalactic background radiations. In paper I, in orderto present the suggested analytical schemes of calculations, we have consideredonly the case of the cosmic microwave background radiation, in the presentpaper we generalize this computation to all relevant background radiations,including infra-red and visible/ultra-violet radiations, collectively referredto as extragalactic background light. The analytic solutions allow transparentphysical interpretation of the obtained spectra. Extragalactic background lightplays an important role at intermediate energies of ultra high energy cosmicray nuclei. The most noticeable effect of the extragalactic background light isthe low-energy tail in the spectrum of secondary nuclei.

Analytic calculations of the spectra of ultra high energy cosmic ray nuclei. II. The general case of background radiation