arXiv subjects

S. P. Roshchupkin

Publications and source records attributed to S. P. Roshchupkin.

11 recordsLinked to original sources

arXiv2025

Characteristic features of the resonant trident process in the field of a strong monochromatic electromagnetic wave

The characteristic features of the resonant trident process (Oleinik resonances) have been theoretically studied in a wide range of frequencies and intensities of a circularly polarized strong electromagnetic wave. The resonant trident process is defined by two characteristic quantum energies: the characteristic energy of the nonlinear Compton effect and the characteristic energy of the nonlinear Breit-Wheeler process. These characteristic energies depend significantly on the frequency and intensity of the wave, as well as on the angle between the momenta of the initial electrons and the electromagnetic wave. The resonant trident process is effective when the energy of the initial electrons is greater than or on the order of magnitude of the corresponding characteristic energies. It is shown that quantum entanglement of final particles takes place in this resonant process. An important aspect of the resonant trident process is the equality of the energies of the electron and positron pairs. Analytical expressions for the differential rates of the resonant trident process on the energy of final particles are obtained. The corresponding analytical expressions for full rates have also been obtained. It is shown that the rate data of the resonant trident process in the field of optical and X-ray wave frequencies significantly exceed the corresponding rate of the non-resonant trident process. Results obtained can be used in experiments at leading laser centers, as well as to explain QED processes in strong X-ray fields near neutron stars and magnetars.

hep-ph↗

arXiv2025

Quantum entanglement of final particle states in the resonant trident pair production in a strong electromagnetic wave

The resonant trident pair production process in the collision of ultrarelativistic electrons with a strong electromagnetic wave is theoretically studied. Under resonant conditions, the intermediate virtual gamma-quantum becomes real. As a result, the original resonant trident pair production process effectively splits into two first-order processes by the fine structure constant: the electromagnetic field-stimulated Compton-effect and the electromagnetic field-stimulated Breit-Wheeler process. The kinematics of the resonant trident pair production process are studied in detail. It is shown that there are two different cases for the energies and outgoing angles of final particles (an electron and an electron-positron pair) in which their quantum entanglement is realized. In the first case, the energy and outgoing angles of final ultrarelativistic particles are uniquely determined by the parameters of the electromagnetic field-stimulated Compton-effect (the outgoing angle of the final electron and the quantum parameter of the Compton effect). In the second case, the energy and outgoing angles of final particles are uniquely determined by the electromagnetic field-stimulated Breit-Wheeler process (the electron-positron pair outgoing angle and the Breit-Wheeler quantum parameter). It is shown that in a sufficiently wide range of frequencies and intensities of a strong electromagnetic wave, and in the case of ultrarelativistic initial electrons, the differential probability of the resonant trident pair production process with simultaneous registration of the outgoing angles of final particles can significantly (by several orders of magnitude) exceed the total probability of the electromagnetic field-stimulated Compton-effect.

hep-ph↗

arXiv2023

The generation of high-energy electron-positron pairs during the Breit-Wheeler resonant process in a strong field of an X-ray electromagnetic wave

The Breith-Wheeler resonant process has been theoretically studied in a strong X-ray electromagnetic wave field under conditions when the energy of one of the initial high-energy gamma quanta passes into the energy of a positron or electron. These resonant conditions have been studied in detail. Analytical formulas for the resonant differential cross-section of channels A and B of the reaction are obtained. It is shown that the resonant differential cross-section significantly depends on the value of the characteristic Breit-Wheeler energy, which is determined by the parameters of the electromagnetic wave and the initial gamma quanta. With a decrease in the characteristic Breit-Wheeler energy, the resonant cross-section increases sharply and may exceed the corresponding non-resonant cross-section by several orders of magnitude.

hep-ph↗

arXiv2023

Generation of narrow beams of ultrarelativistic positrons (electrons) in the resonant strong electromagnetic field-assisted Breit-Wheeler process

The resonant external field-assisted Breit-Wheeler process (Oleinik resonances) for strong electromagnetic fields with intensities less than the critical Schwinger field has been theoretically studied. The resonant kinematics has been studied in detail. The case of high-energy initial gamma quanta and emerging ultrarelativistic electron-positron pairs is studied. The resonant differential cross section is obtained. The generation of narrow beams of ultrarelativistic positrons (for Channel A) and electrons (for Channel B) is predicted with a probability significantly exceeding corresponding to the non-resonant process.

physics.plasm-ph↗

arXiv2022

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

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.

hep-ph↗

arXiv2022

Emission of high-energy gamma quanta by ultrarelativistic electrons on nuclei in strong x-ray fields

The possibility of radiation of high-energy gamma quanta with energies of the order of 100 GeV by ultrarelativistic electrons on nuclei in strong X-ray fields with intensities up to $\sim 10^{27}\ \text{Wcm}^{-2}$ has been theoretically studied. It is shown that this effect can be realized under special experimental conditions in the process of resonant spontaneous bremsstrahlung radiation of ultrarelativistic electrons on nuclei in an external electromagnetic field. These special experimental conditions determine the characteristic energy of the electrons. This characteristic energy should be significantly less than the energy of the initial electrons. Under these conditions, spontaneous gamma quanta are emitted in a narrow cone with energies close to the energy of the initial electrons. Moreover, the resonant differential cross-sections of such processes can exceed the corresponding differential cross-section without an external field by twenty orders of magnitude. The results obtained can explain the occurrence of high-energy gamma quanta near pulsars and magnetars.

hep-ph↗

arXiv2021

Resonant Spontaneous Bremsstrahlung Effect In The Scattering Of Ultrarelativistic Electrons On Nuclei In A Strong Laser Field

The process of resonant spontaneous bremsstrahlung radiation during the scattering of ultrarelativistic electrons with energies of the order $\sim 100\ \text{GeV}$ by the nuclei in strong laser fields with intensities up to $I\sim {{10}^{24}}\ \text{Wc}{\text{m}^{\text{-2}}}$ is theoretically studied. 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. It is shown that in the resonant case there is a characteristic parameter that determines a significant number of absorbed laser photons in the laser-stimulated Compton effect. This parameter is determined by the parameters of the laser installation, the energy of the initial electrons and is proportional to the intensity of the laser wave. 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 ($I\sim {{10}^{18}}\ \text{Wc}{\text{m}^{\text{-2}}}$) and can be of the order of $\sim {{10}^{18}}$ in units ${{Z}^{2}}αr_{e}^{2}$. With an increase in the intensity of the laser wave, the value of the resonant differential cross-section decreases and for the intensity $I\sim {{10}^{24}}\ \text{Wc}{\text{m}^{\text{-2}}}$ is of the order of $\sim {{10}^{4}}$ in units ${{Z}^{2}}αr_{e}^{2}$. 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.

hep-ph↗

arXiv2019

Laser-assisted interaction between nonrelativistic electrons and positrons

The effective interaction between two classical nonrelativistic electrons (positrons) in the presence of intense electromagnetic radiation (one and two waves) is theoretically studied. Small relativistic corrections are taking into account in the laboratory reference frame. The field of an intense wave forms the movement of particles in such a way that their trajectories are practically parallel for quite a long time, and in the perpendicular direction the particles shift slightly, approaching first and then moving away from each other. This result can be considered as an effective attraction of same charged particles. Shown that the effective attraction of two electrons and two positrons could be substantially asymmetric.

physics.plasm-ph↗

arXiv2017

Resonant parametric interference effect in spontaneous bremsstrahlung of an electron in the field of a nucleus and two pulsed laser waves

Resonant spontaneous bremsstrahlung of an electron scattered by a nucleus in the field of two moderately strong pulsed laser waves is studied theoretically. The process is studied in detail within the interference kinematic region. This region is determined by scattering of particles in the same plane at predetermined angles, at that stimulated absorption and emission of photons of external pulsed waves by an electron occurs in correlated manner. The correspondence between the emission angle and the final-electron energy is established in the kinematic region where the resonant parametric interference effect is manifested. The resonant differential cross section of ENSB process with simultaneous registration of both emission angles of the spontaneous photon and the scattered electron, can exceed by 4-5 orders of magnitude the corresponding cross section in the absence of an external field. It was shown for nonrelativistic electrons that the resonant cross section of ENSB in the field of two pulsed laser waves within the interference region in two order of magnitude may exceed corresponding cross section in the Bunkin-Fedorov kinematic region. The obtained results may be experimentally verified, for example, by scientific facilities at sources of pulsed laser radiation (SLAC, FAIR, XFEL, ELI).

quant-ph↗

arXiv2017

Phase shift's influence of two strong pulsed laser waves on effective interaction of electrons

The phase shift's influence of two strong pulsed laser waves on effective interaction of electrons was studied. Considerable amplification of electrons repulsion in the certain range of phase shifts and waves intensities is shown. That leads to electrons scatter on greater distances than without an external field. The value of the distance can be greater on 2-3 order of magnitude. Also considerable influence of the phase shift of pulses of waves on the possibility of effective attraction of electrons is shown.

physics.class-ph↗

arXiv1999

Stimulated Bremsstrahlung in ElectronNucleus Scattering in a Multifrequency Electromagnetic Field

We theoretically investigate stimulated bremsstrahlung emission and absorption (SBEA) in the scattering of a relativistic electron by a nucleus in a multifrequency field of circularly polarized plane electromagnetic waves propagating in the same direction. The general relativistic expression for the SBEA probability is derived. It is demonstrated that the probability of multiphoton SBEA involving an arbitrary number of waves is governed by the functions, which depends on BunkinFedorov quantum parameters and quantum interference parameters. We separate two substantially different kinematic ranges in electron scattering: the BunkinFedorov range and the interference range. In the interference range, we reveal a correlation between the numbers of photons in all the waves. Due to this correlation, the total number of photons emitted or absorbed by an electron (with allowance for the polarizations of waves) is equal to zero. We analyze the cases of nonrelativistic, relativistic, and ultrarelativistic electron energies. It is demonstrated that the probability of multiphoton SBEA for an electron scattered in the interference range may considerably exceed the corresponding probability in the BunkinFedorov range.

cond-mat↗