Other
Scientific paper
Dec 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961rspsa.265..117a&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 265, Issue 1320, pp. 117-132
Other
14
Scientific paper
Measurements have been made at Durham (200 ft. above sea level) with an emulsion spectrograph of the absolute cosmic ray particle intensity in the momentum range 1 to 100 GeV/e at zenith angles of between 65^circ and 85^circ. It is found that a differential π-meson production spectrum of the form I_0E-γ fits closely the present results as well as the accepted vertical spectrum. The values of the parameters when E lies between 6 and 1000 GeV are given by the equations I_0 = 0.425 - 0.125 log10 E and γ = 3.92-0.944(1 - 0.125 log10 E)-1 and their approximate constant values in this range are 0.15 and 2.55 respectively. The analysis is based on the model of Barrett, Bollinger, Cocconi, Eisenberg & Greisen (1952) but, in addition, the effects of scattering and geomagnetic deflexion of μ-mesons in the atmosphere have been taken into account as well as their production over a range of atmospheric depths. Although in principle it should be possible from the form of the sea-level spectra at large zenith angles to determine the relative numbers of π- and K-mesons at production, it is shown that very great accuracy is required in order to do so. Nevertheless, the agreement between the theoretical curves and the experimental measurements indicates that the main assumptions concerning the production and propagation of mesons in the atmosphere are correct. The mean positive to negative ratio is 1.39±0.08, a value rather larger than is found by other observers at 68^circ, but within statistical fluctuation.
Allen Edward J.
Apostolakis A. J.
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