The annihilation of galactic positrons

Details The annihilation of galactic positrons The annihilation of galactic positrons

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7830037b&link_type=abstract

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Physics

Galactic Radiation, Plasmas (Physics), Positron Annihilation, Radiation Spectra, Thermalization (Energy Absorption), Charge Exchange, Energetic Particles, H Ii Regions, Interstellar Matter, Ionization Cross Sections, Monte Carlo Method, Positronium

Scientific paper

The probabilities of various channels of galactic positron annihilation were evaluated and the spectrum of the resulting radiation was calculated. The narrow width (FWHM less than 3.2 keV) of the 0.511 MeV line observed from the galactic center implies that a large fraction of positrons should annihilate in a medium of temperature less than 100,000 K and ionization fraction greater than 0.05. HII regions at the galactic center could be possible sites of annihilation.

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