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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 91 records · Page 5
All sourcesNASA NTRSDOE OSTI
NASA NTRS1969

Origin of galactic gamma-rays.

Origin of galactic gamma rays, discussing evidence in support of interstellar gas in galactic disk and production of neutral pions and bremsstrahlung

Stecker, F. W.↗
NASA NTRS1970

Gamma-ray astronomy balloon results

Gamma ray astronomical point sources by balloon flight and satellite observation, discussing detector system and telescope for flux and energy spectrum

Fichtel, C. E.↗
NASA NTRS1963

Are the recently observed soft gamma-ray bursts from stellar super flares?

The discovery of soft gamma ray bursts has led to the speculation that these bursts are caused by the bremsstrahlung of electrons accelerated to high energies in a stellar flare event. If the stellar flare hypothesis is verified, it may imply a significant source of low energy cosmic rays in the solar neighborhood, depending on the frequency and intensity of the flares.

Stecker, F. W.↗
NASA NTRS1977

Reanalysis of the Apollo cosmic gamma-ray spectrum in the 0.3 to 10 MeV energy region

Additional data obtained from the Apollo 16 and 17 missions, together with collateral calculations on background radiation effects, have made possible an improved subtraction of unwanted backgrounds from the diffuse cosmic gamma ray data previously reported from Apollo 15. As a result, the 1 to 10 MeV spectrum is lowered significantly and connects smoothly with recent data at other energies. The inflection reported previously is much less pronounced and has no more than 1.5 sigma significance. Sky occultation by the Apollo 16 spacecraft shows the bulk of the 0.3 to 1 MeV radiation to be diffuse. The analysis of spurious backgrounds points to important improvements for future experiments designed for this spectral region. A light-weight satellite design can give a fourfold improvement in the signal to noise for such a measurement. Use of an anisotropic central crystal, which spins quickly compared with possible time variations in detector background, would enable sensitive limits to be set on galactic plane and point source contributions.

Dyer, C. S.↗
NASA NTRS1985

Extremely high energy hadron and gamma-ray families(3). Core structure of the halo of superfamily

The study of the core structure seen in the halo of Mini-Andromeda 3(M.A.3), which was observed in the Chacaltaya emulsion chamber, is presented. On the assumption that lateral distribution of darkness of the core is exponential type, i.e., D=D0exp(-R/r0), subtraction of D from halo darkness is performed until the cores are gone. The same quantity on cores obtained by this way are summarized. The analysis is preliminary and is going to be developed.

Yamashita, S.↗