Positron excess in the center of the Milky Way from short-lived β + emitting isotopes

Observations of the INTEGRAL satellite revealed the presence of yet unexplained excess in the central region of the Galaxy at energies around 511 keV. These gamma rays are produced in the process of positron annihilation; the needed rate is around 1042 s−1. In this short paper it is shown that β+ -e...

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Bibliographic Details
Published in:Physical review. D 2016-11, Vol.94 (10), Article 103002
Main Author: Pshirkov, M. S.
Format: Article
Language:English
Subjects:
Cosmic rays
Gamma rays
Isotopes
Milky Way Galaxy
Positron annihilation
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Summary:Observations of the INTEGRAL satellite revealed the presence of yet unexplained excess in the central region of the Galaxy at energies around 511 keV. These gamma rays are produced in the process of positron annihilation; the needed rate is around 1042 s−1. In this short paper it is shown that β+ -emitting isotopes that are formed in interactions of subrelativistic cosmic rays with light nuclei (CNONe) can account for a considerable fraction-up to several tens of percent-of e+ production rate in the central region.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.94.103002