A calculation of the photonuclear energy-loss coefficient bₙ is made by extrapolating recent SLAC inelastic muon scattering data to the 10¹²-eV energy region. Previous methods of calculation are discussed, and attention is drawn to the q² dependence of the inelastic cross section. It is also noted that bₙ should be A dependent. This is predicted from vector dominance and indicated by the SLAC data on photoproduction off complex nuclei. The value of bₙ obtained is 0.21×{}10^-6 g^-1 cm². The relationship of bₙ to observed cosmic-ray muon intensities is discussed, along with the implications of higher bₙ values than are predicted here.
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G. L. Cassiday (1971) studied this question.
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