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  • SPACE RADIATION  (4)
  • 1970-1974  (4)
  • 1
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    Composition of cosmic-ray nuclei at high energies. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We have measured the charge composition of cosmic-ray nuclei from Li to Fe with energies up to about 100 GeV/nucleon. A balloon-borne counter telescope with gas Cherenkov counters for energy determination was used for this experiment. Our first results show that, in contrast to low-energy observations, the relative abundances change as a function of energy. We find that the ratio of the galactic secondary nuclei to primary-source nuclei decreases at energies above about 30 GeV/nucleon.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters; 29; Aug. 14
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The spectrum of galactic electrons with energies between 10 and 900 GeV (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A cosmic-ray electron detector has been exposed during 1970 in three high-altitude balloon flights from Palestine, Texas. The data analysis is based on results from accelerator calibrations with electrons and pions at SLAC. Discrimination against a contamination of the electron data due to interacting protons has been achieved by statistical methods. The resulting differential energy spectrum of cosmic-ray electrons can be well described by a single power law with spectral index 2.66 plus or minus 0.1 up to energies around 250 GeV. Within the experimental uncertainty, no change in this spectral slope up to almost 1000 GeV can be detected. Some implications of these results are discussed.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 186; Dec. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Cosmic rays at very high energies - Discussion of some new results (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent measurements of the nuclear cosmic ray composition up to 100 GeV/n and of the spectrum of cosmic ray electrons to almost 1000 GeV have provided new evidence relevant to the origin of these particles and to their propagation in the interstellar medium. It was shown that the abundance of galactic daughter nuclei decreases with increasing energy relative to the abundance of parent nuclei. It was also found that the energy spectrum of electrons is consistent with a single power law up to 1000 GeV without much steepening. These results are possibly related, and the present work discusses them in terms of (1) a relatively local origin of energetic cosmic rays, (2) an extragalactic origin of the cosmic radiation, and (3) an energy dependent confinement of galactic cosmic rays.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Measurements of the spectrum of galactic electrons at very high energies (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A counter telescope has been exposed in three balloon flights in 1970 to measure the flux and energy spectrum of cosmic ray electrons between 10 and 1000 GeV. This instrument has been modified by incorporating a large area CsI crystal as well as highly efficient time of flight circuitry, and was flown again twice during 1972. The methods of data analysis are based on extensive accelerator calibrations at SLAC. The resulting electron spectrum fits well to a single power law with an index (gamma) equal to 2.66 over the whole energy region. No obvious steepening can be observed, although statistical uncertainties prohibit definite claims beyond 250 GeV.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
    Format: text
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