
Accession Number : AD0015374
Title : THE MESON COMPONENT OF COSMIC RADIATION
Corporate Author : WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
Personal Author(s) : CHARBONNIER,F.M. ; DAVIS,W.R.
Report Date : 1953
Pagination or Media Count : 97
Abstract : Observations were made of the momentum spectrum of mesons at a 3.3km altitude and 48 deg N magnetic latitude and in the vertical and at 46.7 deg E and W of the vertical. The spectra covered the 0.34 to 2Bev/c range. A 12km average height of meson production was estimated on the basis of a comparison of the spectra obtained from the vertical and at an angle. Predictions were also made of the maximum meson production at low altitudes. Studies of zenithangle dependence suggested that the number of mesons produced below 3.3 km does not exceed 5% of the number already present. A value of n = 2.45 + or  0.05 was obtained from the data on the basis of a zenithangle dependence of the form, j(Zeta)=j(O) cos Nu Zeta. Positivetonegative ratios of 1.09 + or  0.06, 1.21 + or  0.08, and 1.22 + or  0.07 for 0.34 to 1.0, 1.0 to 1.67 and above 1.67 Bec/c were obtained in the vertical direction. In the 0.34 to 1Bev/c interval, ratios of 1.40 + or  0.12 and 0.88 + or  0.06, respectively, were obtained at the 46.7 deg zenith angle for the west and east directions. The eastwest asymmetry was calculated to be 0.205 + or  0.076 for positive and 0.264 + or  0.082 for negative particles.
Descriptors : COMPARISON, EAST(DIRECTION), HEIGHT, LOW ALTITUDE, MESONS, MOMENTUM, ORIENTATION(DIRECTION), PARTICLES, PRODUCTION, SPECTRA, VERTICAL ORIENTATION, WEST(DIRECTION).
Distribution Statement : APPROVED FOR PUBLIC RELEASE