Accession Number : AD0743925

Title :   A Balloon Exposure of 30 M squared of Corpuscular Photographic Materials in Search of Super-Heavy Cosmic Radiation.

Descriptive Note : Physical sciences research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Filz,Robert C. ; Enge,Wolfgang ; Davis,Albert

Report Date : 06 APR 1972

Pagination or Media Count : 16

Abstract : Thirty square meters of plastic and nuclear emulsions along with some Cerenkov sensitive material were exposed to cosmic radiation at 120,000 feet in May 1971. The balloon was launched from Holloman AFB, New Mexico (vertical cutoff rigidity pc = 5.0 BV) and remained in the immediate vicinity for 48 hours. During this period, four distinct altitude intervals were distinguished by a sliding plate. Preliminary examination of 1/3 of the cellulose nitrate layer indicates about 170 nuclei of charge greater than iron will be available for study. Precision measurements will be performed on layers of Daicel cellulose nitrate, Bayer cellulose triacetate and Lexan to determine the charge spectrum of relativistic very heavy cosmic rays. Measurements on the Cerenkov film sensitive to relativistic nuclei with charge greater than 60 and velocity greater than about 0.7 will provide a good check on the velocity and charge of super heavy nuclei. Preliminary scanning data is discussed. (Author)

Descriptors :   (*UPPER ATMOSPHERE, COSMIC RAYS), (*COSMIC RAYS, RADIATION MEASURING INSTRUMENTS), PHOTOGRAPHIC EMULSIONS, PHOTOGRAPHIC MATERIALS, CERENKOV RADIATION, NITROCELLULOSE, BALLOONS

Subject Categories : Atmospheric Physics
      Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE