Physics
Scientific paper
Oct 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963rspsa.275..391h&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 275, Issue 1362, pp. 391-410
Physics
30
Scientific paper
The rate of energy loss of muons is examined by comparing the observed depth-intensity relation with that predicted from a knowledge of the sea-level energy spectrum of cosmic ray muons. The evidence for each of the parameters entering into the analysis is assessed and estimates are made of the sea-level muon spectrum up to 10 000 GeV and the depth-intensity relation down to 7000 m.w.e. The effect of range-straggling on the underground intensities is considered and shown to be important at depths below 1000 m.w.e. Following previous workers the energy loss relation is written as -dE/dx = 1.88 + 0.077 lnE'_m/mc^2 + bE MeV g-1 cm^2, where E'_m is the maximum transferrable energy in a μ-e collision and m is the muon mass. The first two terms give the contribution from ionization (and excitation) loss and the third term is the combined contribution from pair production, bremsstrahlung and nuclear interaction. The best estimate of the coefficient b from the present work is b = (3.95 ± 0.25) x 10-6 g-1 cm^2 over the energy range 500 to 10 000 GeV, which is close to the theoretical value of 4.0 x 10-6 g-1 cm^2. It is concluded that there is no evidence for any marked anomaly in the energy loss processes for muons of energies up to 10 000 GeV.
Hayman P. J.
Palmer N. S.
Wolfendale Arnold W.
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