Angular Distribution and Altitude Dependence of Atmospheric Neutrons from 10 to 100 MeV.
CALIFORNIA UNIV RIVERSIDE INST OF GEOPHYSICS AND PLANETARY PHYSICS
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The altitude dependence of atmospheric neutrons from ground level to 5 gsq cm of residual atmosphere at neutron energies of 10 to 100 MeV is reported. Ground level measurements were taken at Cape Girardeau, Missouri, on September 18, 1972. The other measurements were made during ascent and float on launch from Palestine, Texas on September 26, 1971. The intensity of both the downward and upward moving neutrons is maximum at about 100 gsq cm of residual atmosphere. Neutron angular distributions are reported from 20 degrees to 80 degrees and 100 degrees to 160 degrees for 10 to MeV neutrons. Omnidirectional fluxes at altitudes at 5, 50, 100, and 200 gsq cm residual atmosphere are in good agreement with recent theoretical calculations of Armstrong et al. in the three energy intervals of 10-30, 30-50, and50-100 MeV. Author
- Atmospheric Physics