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

Report Date:

1968-07-01

Pagination or Media Count:

39.0

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 gmcm 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 0.001sqcmsec can be detected. Author

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE