Gamma-ray spectroscopy of the galactic center region: Confirmation of the time-variability of the positron annihilation line

Details Gamma-ray spectroscopy of the galactic center region: Confirmation of the time-variability of the positron annihilation line Gamma-ray spectroscopy of the galactic center region: Confirmation of the time-variability of the positron annihilation line

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982grsg.book.....p&link_type=abstract

NASA Tech. Memo., NASA-TM--83921, 16 p.

Physics

Galactic Nuclei, Gamma Ray Spectrometers, Positron Annihilation, Particle Emission, Photons, Time Dependence

Scientific paper

The GSFC Low-Energy Gamma-Ray Spectrometer observed the region of the galactic center during a balloon flight from Alice Springs, Australia, on 1981 November 20. No significant excess over background was evident in the 511 keV annihilation line. A 98 percent confidence upper limit is derived for this line of 1.2 x .001 photons/sq. cm-s. Continuum emission was detected above 100 keV with a best-fitting power law spectrum.

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