Approximate approach for description of two-photon bremsstrahlung emitted by the relativistic projectile scattered in a spherically-symmetric filed of the target is suggested. It based on the accurate treatment of the analytical structure of singularities in relativistic one-photon free-free matrix elements. For the case of Coulomb field of the target the closed-form analytical expressions for ...

We perform stability analysis of an accretion disc around a stellar mass black hole. The cooling of the accretion flow due to bremsstrahlung and synchrotron radiation processes are considered. The solutions with shock are perturbed at the shock location and the radial dependence of perturbation is obtained by solving the equations numerically using fourth-order Runge-Kutta method. The perturbat...

The paper supplies numerical information on coherent effects of bremsstrahlung and electron pair production in diamond crystals in the energy range from 1 to 40 GeV. The information is collected in a number of graphs and tables showing the intensity and polarization of bremsstrahlung and the cross section and asymmetry ratio for pair production as a function of crystal orientation. The basic fo...

A simple derivation of the “edge radiation” emitted by an electron beam going through a bending magnet in the directions of its entrance and exit from the magnet itself is presented. This radiation is characterized by wavelengths much longer than the synchrotron radiation critical wavelength in the same magnet. The far field radiation emitted by an electron following a curved trajectory inside ...

We study classical bremsstrahlung from neutral atoms and investigate the origins of the structures in the energy dependence of the differential cross section ωdσ/dω and the asymmetry parameter a2, using soft-photon limit results in terms of elastic scattering. We show that trapping features in elastic scattering do not contribute to the structures. Rather, these structures result from the suppr...

Although both electron-ion and electron-electron bremsstrahlung contribute to the hard Xray emission from solar flares, the latter is normally ignored. Such an omission is not justified at electron (and photon) energies above ∼ 300 keV, and inclusion of the additional electron-electron bremsstrahlung in general makes the electron spectrum required to produce a given hard X-ray spectrum steeper ...

The Landau, Pomeranchuk, Migdal (LPM) effect (suppression of the bremsstrahlung from high energy electron due to a multiple scattering of an emitting electron in dense media) is considered for the case when thickness of a target is of the order or less than the formation length of radiation. The effects of the polarization of a medium and transition radiation are taken into account as well. Qua...

We investigate the energy loss of quarks and gluons produced in hard processes resulting from final state rescatterings in a finite quark-gluon plasma. The angular distribution of the soft gluon bremsstrahlung induced by ns = 1 rescatterings in the plasma is computed in the Gyulassy-Wang model. Special focus is on how the interference between the initial hard radiation amplitude, the multiple i...

Abstract Relativistic electrons generated by the interaction of petawatt-class short laser pulses with solid targets can be used to generate bright x-rays via bremsstrahlung. The efficiency energy transfer into these depends on multiple parameters including focused intensity and pre-plasma level. This paper reports experimental results from a high glass at maximum 10 19 W cm ?2 . In-situ measur...

Based on the experimental data from Weninger, Putterman, and Barber, Phys. Rev. E 54, R2205 ~1996!, we offer an alternative interpretation of their experimental results. A model of sonoluminescing bubble which demonstrates that the electromagnetic radiation originates from two sources: the isotropic black body or bremsstrahlung emitting core and dipole radiation-emitting shell of accelerated el...