Accession Number : AD0765906

Title :   Angular Distribution and Altitude Dependence of Atmospheric Neutrons from 10 to 100 MeV.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV RIVERSIDE INST OF GEOPHYSICS AND PLANETARY PHYSICS

Personal Author(s) : Preszler,Alan M. ; Simnett,George M. ; White,R. Stephen

Report Date : 27 JUL 1973

Pagination or Media Count : 33

Abstract : The altitude dependence of atmospheric neutrons from ground level to 5 g/sq 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 g/sq 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 g/sq 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)

Descriptors :   (*MAGNETOSPHERE, *NEUTRON FLUX), ALBEDO, VAN ALLEN RADIATION BELT, NEUTRON SPECTRUM, DISTRIBUTION FUNCTIONS, COSMIC RAYS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE