The generation of narrow ultrarelativistic beams of positrons (electrons) in the process of resonant photogeneration of pairs on nuclei in a strong electromagnetic field

TL;DR

This paper theoretically predicts that high-energy gamma quanta interacting with nuclei and strong electromagnetic fields can produce narrow, ultrarelativistic beams of positrons or electrons with very high probability, due to resonant pair photogeneration.

Contribution

It introduces a new mechanism for generating narrow ultrarelativistic particle beams via resonant pair photogeneration in strong electromagnetic fields, with significantly enhanced cross-sections.

Findings

Resonant differential cross-section can exceed non-field cases by thirteen orders of magnitude.

Ultrarelativistic positrons or electrons are emitted with energies close to initial gamma quanta.

High probability of generating narrow particle beams in strong electromagnetic fields.

Abstract

The generation of narrow beams of high-energy positrons (electrons) in the process of resonant photogeneration of ultrarelativistic electron-positron pairs by high-energy gamma quanta in the field of the nucleus and a strong electromagnetic wave is theoretically predicted. It is shown that if the energy of the initial gamma quanta significantly exceeds the characteristic energy of the process, then ultrarelativistic positrons (for channel A) or electrons (for channel B) are emitted with energies very close to the energy of gamma quanta. Moreover, the resonant differential cross-section of such processes can exceed the corresponding differential cross-section without an external field by thirteen orders of magnitude. This effect makes it possible to obtain narrow beams of ultrarelativistic positrons (electrons) in strong electromagnetic fields with high probability.