Axion bremsstrahlung by electrons scattered in a magnetic field of Abrikosov strings (fluxoids) with a single quantum of magnetic flux is considered. The axion luminosity of a highly degenerate relativistic electron gas caused by the above process taking place in the superconducting core of a neutron star is calculated. By comparing this luminosity with that caused by neutrino pair bremsstrahlung in electron scattering by fluxoids, restriction on the axion-electron coupling constant is obtained.
Department of Theoretical Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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