Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...457..431j&link_type=abstract
Astrophysical Journal v.457, p.431
Astronomy and Astrophysics
Astronomy
4
Atomic Processes, Elementary Particles, Ism: General
Scientific paper
In the nonrelativistic limit, the direct one-photon annihilation rate of nonthermal positrons with bound atomic electrons is calculated. For various spectral power indices, the total annihilation rate of positrons with an atom is calculated by considering the K- and L-shell contributions. The total number of one-photon annihilation events for the abundant interstellar elements (H, He, C, N, O, Ne, Mg, Si, S, and Fe) with respect to the hydrogen atom are evaluated. The result shows that in the interstellar medium the main contributors to one-photon positron annihilations are Fe, O, and Si atoms for low power index (F = 6), Fe, H, and He atoms for intermediate power index (Γ = 7), and H, He, and 0 atoms for high power indices (Γ = 8-10). The total number of annihilation events is quickly decreasing with increasing power index. The L-shell contribution is increased as the power index increases; for example, the L-shell contribution of atomic oxygen is about 6% and 38% for Γ = 6 and 10, respectively.
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