Abstract
The resonant photoproduction of the electron-positron pairs on a nucleus near a surface of the X-ray pulsar was studied theoretically. The main feature of the processes, which are responsible for the formation of the electron-positron fluxes, is a capability to occur in a resonant way in the electromagnetic field of the X-ray pulsar. One of the properties of the resonant case is that the initial process of second order in the fine structure constant in an external field effectively reduces into two successive processes of the first order due to the fact that in the resonant conditions intermediate virtual electron (positron) becomes a real particle. It is shown that the resonances are possible only when the initial gamma quantum energy is more than the threshold energy, which significantly depends on the number of absorbed photons of an external electromagnetic field. Additionally, in the resonant conditions, the energies of the particles depend on the outgoing angle of a positron (channel A) or an electron (channel B). It is shown that the resonant differential cross section has an extremely large magnitude in units αZ2re2. A mechanism to explain the presence of anomalous fluxes of ultrarelativistic positrons near the surface of an X-ray pulsar was proposed.
Highlights
Astroparticle physics has proclaimed itself in previous decades as a dynamically developing and relevant field of investigation due to the fact that it represents the compound of particle physics, astrophysics, and cosmology [1]
In the present article, we examine one relevant process, which makes an influence on the creation of electron-positron fluxes. This is the resonant photoproduction of pair (PPP) by a gamma quantum on a nucleus in the external electromagnetic field
It is a proverbial fact that the presence of an external electromagnetic field causes nonlinear quantum electrodynamics (QED) reactions [5,6] that lead to a cascade production of electron-positron pairs [7,8]
Summary
Astroparticle physics has proclaimed itself in previous decades as a dynamically developing and relevant field of investigation due to the fact that it represents the compound of particle physics, astrophysics, and cosmology [1]. In the present article, we examine one relevant process, which makes an influence on the creation of electron-positron fluxes This is the resonant photoproduction of pair (PPP) by a gamma quantum on a nucleus in the external electromagnetic field. We develop the theory of several first resonances (with the absorption of one, two, three, and so on photons of an external field) for the resonant PPP by a high-energy gamma quantum in the field of a nucleus and an external field of the X-ray pulsar We note that this problem has been investigated before for the optical frequency range [23,24,25,26,27,28]. In current research, we are interested in the X-ray frequency range that takes place for the X-ray pulsars
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