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arxiv:0711.3008
The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium
Published on Apr 6, 2009
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Abstract
We consider positron propagation in the interstellar medium and show that the positrons from the beta-plus decay chains of the radioactive nuclei Ni-56, Ti-44, and Al-26, produced in Galactic supernovae, can fully account for all the features of the diffuse Galactic 511 keV annihilation radiation observed by INTEGRAL/SPI. We also predict additional measurable features that can further test the origin of positrons and provide new information on the nature of the interstellar medium.
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