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- W1995865995 abstract "Abstract The Galactic plane was scanned nearly three times by the UCSD/MIT Hard X-Ray and Low Energy Gamma-Ray Experiment on HEAO-1 from August 1977 through September 1978. Its Medium Energy Detectors were of the NaI/CsI phoswich type and operated over the 100 keV to 2 MeV range, with a 17° FWHM field of view and a 9% energy resolution at 511 keV. Sky maps for each epoch of observation were constructed in several energy bands. After subtraction of known point sources, a component associated with the galactic plane remains, whose spectrum is consistent with a power law and a positron annihilation spectrum. In the 333 to 583 keV energy band the flux is concentrated within±35° of the galactic center, and the ratio of flux/radian (anticenter) is high, with a 2σ lower limit of 13. The parameters of the galactic center region's annihilation spectrum are positronium fraction of 0.9±0.1 and 511 keV flux of (2.0±0.7)×10 −3 photons/cm 2 -sec-rad." @default.
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- W1995865995 date "1993-12-01" @default.
- W1995865995 modified "2023-09-27" @default.
- W1995865995 title "Observations of diffuse galactic positron annihilation radiation" @default.
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- W1995865995 doi "https://doi.org/10.1016/0273-1177(93)90183-c" @default.
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