Resonant spontaneous bremsstrahlung in the scattering of ultrarelativistic electrons on nuclei in a strong light field

Abstract

Abstract An analytical study of the process of resonant spontaneous bremsstrahlung radiation during the scattering of ultrarelativistic electrons with energies by the nuclei in strong laser fields with intensities up to I ∼ 1025 Wcm-2 was carried out. Under resonant conditions, an intermediate electron in the wave field enters the mass shell. As a result, the initial second-order process by the fine structure constant is effectively reduced to two first-order processes: laser-stimulated Compton effect and laser-assisted Mott process. The resonant kinematics for two reaction channels (A and B) is studied in detail. An analytical resonant differential cross-section with simultaneous registration of the frequency and the outgoing angle of a spontaneous gamma-quantum is obtained. It is shown that the resonant differential cross-section has the largest value in the region of average laser fields and can be of the order of ∼ 1018 in units Z 2 α r e 2 . The obtained results reveal new features of spontaneous emission of ultrarelativistic electrons on nuclei in strong laser fields and can be tested at international laser installations.