One-Photon Annihilation of Thermal Positrons in the Interstellar Medium

Details One-Photon Annihilation of Thermal Positrons in the Interstellar Medium One-Photon Annihilation of Thermal Positrons in the Interstellar Medium

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500.1055j&link_type=abstract

Astrophysical Journal v.500, p.1055

Astronomy and Astrophysics

Astronomy

1

Atomic Processes, Elementary Particles, Ism: General

Scientific paper

In the interstellar medium, one-photon annihilation of thermal positrons with bound atomic electrons is investigated. The total annihilation rate of thermal positrons with an interstellar element is calculated considering the K- and higher shell (L, M, and N) contributions from abundant many-electron atoms. The results show that the main contributions to one-photon annihilation are H, He, and C atoms in hot medium T bar (=kT/Ry)=1 , H, Mg, and He atoms in warm medium T bar =0.1 , Mg, H, and Fe atoms in cold medium T bar =0.01 , respectively. In a hot medium, positrons are mostly annihilated with the K-shell electrons; for example, the K-shell electrons of H and He atoms. However, in a cold medium positrons are annihilated with higher shell electrons; for example, the M-shell electrons of Mg atom and the N-shell electrons for Fe atom give main contributions.

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