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Results for “ENERGY SPECTRUM”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 163 records · Page 9
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NASA NTRS1986

Measuring the energy spectrum of primary cosmic rays with the Yakutsk EAS array

The Yakutsk Extensive Air Showers (EAS) array was designed for detecting the showers generated by the 10 to the 47th power to 10 to the 20th power eV primary cosmic rays and consists of numerous electron, muon, and Cerenkov light detectors arranged on a 20 sq km area terrain. The array is featured by the feasibility to detect the EAS-produced Cerenkov light, hence, as will be shown, to find the mean energy of the primary particles generating an ensemble of EAS of given size. Date collected is discussed.

Khristiansen, G. B.↗
NASA NTRS1986

Changes in the energy spectrum of anomalous oxygen during 1977-1985

Spatial and temporal variations of the interplanetary cosmic ray oxygen spectrum over the 11 yr solar and cosmic ray modulation cycle are discussed. The variations were monitored with instrumentation on the Voyager 1 and 2 and the Pioneer 10 spacecraft over the period 1977-85. The analysis concentrates on 4-30 MeV nuclei, where the anomalous component of cosmic rays dominates. The number of particles of anomalous oxygen increased with increasing distance from the sun. Furthermore, the particles exhibited, on the average, higher energies after the middle of 1980, when a solar magnetic field reversal occurred. The Voyager 1 spacecraft, 24 deg out of the ecliptic plane, did not register as high a shift in energy during the same period. It is concluded that cosmic ray drift effects are closely associated with solar magnetic field polarity reversals, a situation which may be examined more fully during the solar minimum beginning in 1985.

Cummings, A. C.↗
NASA NTRS1985

An experiment to measure the energy spectrum of cosmic ray antiprotons from 100 to 1000 MeV

Production models were developed and the confirmation of each one had significant astrophysical impact. These include radical modifications of propagation models, cosmic ray antiprotons injection from neighboring domains of antimatter, p production by evaporating primordial black holes, and cosmic ray p's as annihilation products of supersymmetry particles that might make up the dark dynamical mass of the Galaxy. It is that p's originating from supersymmetric parents might have distinct spectral features that would survive solar modulation; in one model, higgsino annihilation proceeds through the bb quark-antiquark channel, producing a spectral bump at approx. 0.3 GeV in the p spectrum.

Salamon, M. H.↗