Accession Number : AD0699576

Title :   STUDY OF THE ABSOLUTE FLUX AND ENERGY SPECTRUM OF COSMIC RAY NEUTRONS IN THE ATMOSPHERE.

Descriptive Note : Final rept. 1 May 64-30 Apr 68,

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

Personal Author(s) : Ballerini,R. ; Bland,J. C. ; Boella,G. ; Antoni,G. Degli ; Dilworth,C.

Report Date : 01 JUL 1968

Pagination or Media Count : 39

Abstract : A neutron detector has been constructed to measure the flux and energy spectrum of cosmic ray neutrons in the atmosphere over the energy range (thermal energy -20MeV). The latitude effect of the neutron flux was determined by comparing the counting rate of the detector during balloon launches at different geomagnetic latitudes. A counting-rate variation with altitude has also been observed due to a variation of the neutron energy spectrum with altitude. An improved version of the detector has been made. The results of balloon and rocket launches led to a determination of the neutron flux as a function of the atmospheric depth, from 300 to 0.1 gm/cm sq cm. Furthermore a high energy neutron detector has been made to measure the steady state solar neutron flux over the energy range 30-120MeV. Background estimation shows that a neutron flux from the sun of the order of 0.001/sqcm/sec can be detected. (Author)

Descriptors :   (*COSMIC RAYS, ATMOSPHERIC SOUNDING), (*NEUTRON COUNTERS, DESIGN), MEASUREMENT, BALLOONS, HIGH ALTITUDE, SOUNDING ROCKETS, DETECTION, BACKGROUND, INTERACTIONS, NEUTRONS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE