Accession Number : AD0668483

Title :   THE ATMOSPHERIC AND LEAKAGE FLUX OF NEUTRONS PRODUCED IN THE ATMOSPHERE BY COSMIC RAY INTERACTIONS,

Corporate Author : MILAN UNIV (ITALY) ISTITUTO DI SCIENZE FISICHE

Personal Author(s) : Boella,G. ; Dilworth,C. ; Panetti,M. ; Scarsi,L.

Report Date : 15 DEC 1967

Pagination or Media Count : 38

Abstract : The curve of the integrated neutron flux in the 'thermal' to 20 MeV energy range, as a function of the atmospheric depth from sea level up to 0.1 mbar, has been obtained, assuming as energy spectrum that predicted by Newkirk. The instrument employed is a combination of an hydrogeneous moderator with a slow neutron detector, with anticoincidence rejection of background events. Four balloon flights have been carried out in March 1966; one rocket flight in July 1966. With this flight the curve has been extended to 0.1 mbar from 6 mbar, attained with the balloon flights. The neutron flux as a function of the atmospheric depth is given, at 5.3 GV geomagnetic cut-off rigidity, in quiet Sun conditions. (Author)

Descriptors :   (*COSMIC RAYS, INTERACTIONS), (*NEUTRONS, *UPPER ATMOSPHERE), ALBEDO, CHARGED PARTICLES, IONIZATION, NEUTRON COUNTERS, THERMAL PROPERTIES, ENERGY, DETECTION, SCINTILLATION COUNTERS, SOURCES, EFFICIENCY, ATMOSPHERIC SOUNDING, BALLOONS, SOUNDING ROCKETS, FLIGHT PATHS, INTENSITY, ABSORPTION, ITALY

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE