Mathematics – Logic
Scientific paper
Apr 1948
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948natur.161..645d&link_type=abstract
Nature, Volume 161, Issue 4095, pp. 645 (1948).
Mathematics
Logic
Scientific paper
IN an earlier publication1, it was reported that the intensity of cosmic rays appears to be closely related with the height of the 7.5-cm. mercury pressure-level. It was found that the correlation of cosmic-ray intensity at constant atmospheric pressure with the height of lower pressure-levels is rather low, though gradually increasing with height. When the 7.5-cm. pressure-level is chosen-the highest for which sufficient meteorological data were then available-this correlation reaches the value - 0.67. On the basis of the instability of the meson and by assuming that the bulk of the penetrating component originates at this presure-level, the value 18.6 km. was obtained for the mean range of mesons. In support of this hypothesis is the fact that if we take for the mass 180 me and for the average momentum of the mesons along their path down to sea-level the value 2,800 MeV./c. given by Rossi2, then we have for the rest-life the value 2.04 × 10-6 sec., which agrees with the one generally accepted.
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