Two-photon annihilation radiation in strong magnetic field - The case of small longitudinal velocities of electrons and positrons

Details Two-photon annihilation radiation in strong magnetic field - The case of small longitudinal velocities of electrons and positrons Two-photon annihilation radiation in strong magnetic field - The case of small longitudinal velocities of electrons and positrons

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138....1k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 1, Nov. 1987, p. 1-18.

Astronomy and Astrophysics

Astrophysics

10

Annihilation Reactions, Gamma Ray Bursts, Magnetic Fields, Neutron Stars, Positron Annihilation, Angular Distribution, Particle Interactions

Scientific paper

Spectra, angular distributions, and polarization of two-photon annihilation radiation in a magnetic field are studied in detail in the case of small longitudinal velocities of annihilating electrons and positrons which occupy the ground Landau level. Magnetic field essentially affects the annihilation if its magnitude B is not very low in comparison with Bcr = 4.4×1013G, which may take place near the surface of a neutron star. The magnetic field broadens the spectra and leads to their asymmetry. The angular distribution may be highly anisotropic, being fan-like or pencil-like for different photon energies ω. The total annihilation rate is suppressed by the magnetic field. The radiation is linearly polarized; the degree and orientation of the polarization depend on B, θ and ω. The polarization may reach several tens percent.

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