Resonant effects in the spontaneous bremsstrahlung process of ultrarelativistic electrons in the fields of a nucleus and a pulsed light wave

Abstract

Abstract This article focuses on the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies E i ≳ 10 2 GeV in the field of a nucleus and a quasimonochromatic laser wave with an intensity I ≲ 10 16 ÷ 1017 W cm−2. Under resonant conditions within the light field the intermediate virtual electron transformed into a real particle. Therefore, the initial second order process in accordance with the fine structure constant in the laser field effectively reduced to two successive processes of the first order: the laser-stimulated Compton-effect and laser field-assisted scattering of an electron by a nucleus. In this work we derive the expressions for the resonant differential cross-sections of this processes using the simultaneous registration of the frequency and outgoing angle of the spontaneous photon and the absorption of the rth wave of photons (where r = 1,2,3,...is the resonance number). To summarize, for the first resonance of channel A, the resonant differential cross-section attains a magnitude of the ∼1012 and the third resonance of channel B attains ∼105 in units of α Z 2 r e 2 ( c m 2 ) . Finally, scientific laser pulse radiation (SLAC, FAIR, XFEL, ELI, XCELS) can be used to verify the model calculations.