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- W2013723897 abstract "Mesotron intensities are being simultaneously recorded at Fordham University, 142 ft above sea level, and on the 87th floor level of the Empire State Building (ESB), 1125 ft above sea level. Identical types of cosmic ray telescopes are used at each station, and the aperture of each telescope is such that the sensitive cone is not screened by the tower structure of the ESB. By this method of simultaneous observations, errors due to variations of barometric pressure and atmospheric temperature are largely cancelled, since the final calculations of mesotron intensity for any given period are determined by the ratio of the counting rates of the two telescopes during the same period.Each telescope is permanently screened against the softer component by 20 cm of lead. For the first series of observations both telescopes were located at Fordham. and alternate runs were made with and without an additional screening of 35.5 gm/cm2 of lead above the telescope destined to be placed at the ESB; this procedure was repeated after transfer of that telescope to the ESB.An increase of 3.3 per cent in intensity at the higher station is computed and is interpreted as representing that fraction of mesotrons decaying while traversing the 983 ft difference in elevation between stations. A mean free path of 9.34 km is thus indicated. For mesotrons of γ = 17.5 the resultant lifetime, τ0 is 1.8×10−6 sec.Observations are being continued with a view of determining τ0 through correlation of mesotron variations with variations in altitude of certain pressure levels of the upper atmosphere." @default.
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- W2013723897 date "1946-01-01" @default.
- W2013723897 modified "2023-09-25" @default.
- W2013723897 title "Simultaneous cosmic ray measurements on the Empire State Building Tower and at Fordham University" @default.
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- W2013723897 doi "https://doi.org/10.1029/tr027i005p00665" @default.
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