Spontaneous bremsstrahlung of ultrarelativistic electrons within the resonant conditions in the field of a nucleus and external electromagnetic field

Abstract

The contemporary theoretical research focuses on the kinematics of the resonant spontaneous bremsstrahlung of ultrarelativistic electrons for the case of particles scattering on a nucleus in the presence of the external laser field. The energy spectrum of the observable electrons represents considerable magnitude gradation. The resonant state determines the emersion of the intermediate particle into the real. Therefore, the aftermath of the transition realizes the splitting of the second order process with accordance to the fine structure into two subsequent first order processes: the laser-assisted Mott scattering of an electron on a nucleus and the laser-stimulated Compton effects. Additionally, with the alteration of the combinational sequence of the described mechanisms the phenomenon indicates two possible reaction channels referring the Compton or Mott procedures to initiate the interaction. Furthermore, the evaluation of the system illustrates the essential dependency of the resonant frequency on the channel selection. The computational experiments demonstrate the linear specification of the resonant frequency by the emission angle of the spontaneous photon in the compound with Compton occurrence to develop originally in contrast to the option of the Mott appearance initiation to produce three various values for the resonant frequency level. In conclusion, the investigation calculates the differential cross sections of the resonance in comparison to the standard cross section estimated in the absence of the external field. Substantial quantity of scientific facilities with profile in pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS) may experimentally verify the project examination.