Detection of 511 keV positron annihilation radiation from the galactic center direction

Details Detection of 511 keV positron annihilation radiation from the galactic center direction Detection of 511 keV positron annihilation radiation from the galactic center direction

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978grsa.rept..169l&link_type=abstract

In NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys. p 169-189 (SEE N78-31971 22-88)

Astronomy and Astrophysics

Astronomy

3

Energy Spectra, Galactic Radiation, Gamma Ray Astronomy, Positron Annihilation, Balloon-Borne Instruments, Gamma Ray Telescopes, Germanium, Line Spectra, Photons

Scientific paper

A balloon-borne gamma ray telescope with an approximately 130 cu cm high purity germanium detector was flown over Australia to detect sharp spectral features from the galactic center direction. A 511 keV positron annihilation line was observed at a flux level of (1.21 plus or minus 0.22) x (10/cu cm) photons/sec/sp cm. Suggestive evidence for the detection of the three-photon positronium continuum is presented. The possible origin of the positrons is discussed.

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