Accession Number : AD0616297

Title :   ELECTRONS, HYDROGEN AND HELIUM NUCLEI OBSERVED IN THE PRIMARY COSMIC RADIATION DURING 1963,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS SCHOOL OF PHYSICS AND ASTRONOMY

Personal Author(s) : Freier,P. S. ; Waddington,C. J.

Report Date : MAY 1965

Pagination or Media Count : 45

Abstract : Singly and doubly charged particles in the cosmic radiation were observed during a balloon flight made over Fort Churchill on the 28th July 1963. These particles were detected in nuclear emulsions mounted in a mechanical device which imposed unique temporal resolution between those entering during the balloon ascent and those entering while the balloon floated at ceiling altitude. The integral intensity at the top of the atmosphere of protons having E > 74 MeV was determined to be 2440 = 160 protons/sq-m ster.sec. while that of helium nuclei having E > 62 MeV per nucleon was 272 = 13 nuclei/sq.m ster. sec. The differential energy spectra of the protons and helium nuclei have been studied over the energy ranges of 74 MeV < or= E < or= 4 BeV and 62 MeV per nucleon < or= E < or= 1.67 BeV per nucleon respectively. Because of the unprecedented energy range covered in the proton study, it has been possible to compare these particles over a far greater spread of overlapping rigidities than has hitherto been possible. Small numbers of electrons were also observed with results which are in reasonable agreement with those previously reported by other workers. The problem of correcting for secondary electrons appears unresolved, but if ignored, a total intensity of 63 = 26 electrons/sq.m ster.sec. with 130 < or= E < or= 5 BeV was observed under 2 g/sq.cm of air. (Author)

Descriptors :   (*COSMIC RAYS, INTENSITY), (*ELECTRONS, COSMIC RAYS), (*HYDROGEN, COSMIC RAYS), (*HELIUM, COSMIC RAYS), (*PROTONS, COSMIC RAYS), NUCLEONS, ENERGY, SECONDARY EMISSION, RADIATION MEASURING INSTRUMENTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE