Conveners
PS: Poster Session: Session PS1
- Dariush Hampai (Istituto Nazionale di Fisica Nucleare)
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35. Excitation of a giant dipole resonance by radiation of channeled electrons in a Si (110) crystalNikita Ashurko05/06/2023, 18:10poster
The study of giant dipole resonance (GDR) as a collective nuclear excitation [1] is a relevant area of theoretical and experimental research. GDR was first observed in the experiments on the braking γ-beam (bremsstrahlung - BS) [2]. Interest in this fundamental phenomenon does not weaken in our days [3].
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Channeling radiation (CR) of electrons in crystals has been studied in detail [4] and... -
Alexey Dik05/06/2023, 18:11poster
Based on solution of Dirac equation, the dynamics of a quantum particle with a half-integer spin in the field of an arbitrary inhomogeneous electromagnetic wave has been analyzed. It is shown that, in the first order of expansion in longitudinal energy, the effective interaction potential of a fermion coincides with that of a scalar particle, while the spin features of interaction in this...
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Alexey Dik05/06/2023, 18:12poster
We have considered the motion of a nonrelativistic charged particle near flat solid surface at sliding angles based on the result of work [S.B. Dabagov and A.V. Dik, "Surface channeling of charged and neutral beams in capillary guides.", Quantum Beam Science, 6(1), 2022.] devoted to the analysis of a nonrelativistic charged particle motion in a cylindrical single capillary. The interaction...
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Alexey Dik05/06/2023, 18:13poster
The interaction of particles in the channeling regime with crystal lattices has a number of features that allow controlling charged particle beams [Edouard N. Tsyganov, "Some aspects of the mechanism of a charge particle penetration through a monocrystal.", FERMILAB preprint, 1976.], as well as obtaining high-energy electromagnetic radiation [M.A. Kumakhov, "On the theory of electromagnetic...
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Mr Matthew Dickers05/06/2023, 18:14poster
Crystal-based Light Sources (CLS) offer a novel method to produce sources of gamma-rays. Making use of the channelling phenomena, ultra-relativistic charged particles are directed through bent crystals to produce synchrotron-like radiation. These bent crystals are produced by doping a base crystal, thus changing the crystalline inter-planar distances.
In this preliminary study we conduct...
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Dmitrii Gavrilenko05/06/2023, 18:15poster
Generalized theory of Compton backscattering in terms of luminosity, suitable for both classical and quantum regimes obtained. Optimal parameters, which require a certain mutual orientation and inclination of the fronts of the laser and electron beams described by 3D Gaussians, correspond to the crab scheme. The scattering of diverging beams was also considered. The constructed theory not...
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Vladimir Maisheev05/06/2023, 18:16poster
A series of experiments demonstrated the possibility of focusing positively charged particles using focusing crystals. In these experiments, between a crystalline focusing crystal and the position of the focus was a space free from magnetic fields. In this work, we consider an important case from the point of view of practical aither dipole or quadrupole.se when between the focusing crystal...
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Mykola Maksyuta05/06/2023, 18:17poster
The paper shows that when beams of non-relativistic protons are channeled along the axes of carbon nanotubes (non-chiral nanotubes of the type are chosen, in which the chains of carbon atoms are located in the corners of a regular 2n-gon), the formation of fast directed beams of neutral hydrogen atoms is possible. Consideration of such a mechanism is carried out using the non-stationary...
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Mr Alexander Popov, Dr Anastasia Dimitrieva, Dr Andrew Shemukhin, Anton Stepanov05/06/2023, 18:18poster
The combination of chemical and physical processes is the main mechanism of the CNTs' bactericidal action. The mechanism of the antibacterial effect of nanomaterials has not been sufficiently studied to date. Changing the structure of carbon nanomaterials by ion beams allows one to adjust their electrical and magnetic properties, vary the thermal conductivity of individual carbon nanofibers,...
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Dr Oleg Bogdanov05/06/2023, 18:19poster
The twisted photon is the electromagnetic wave carrying the orbital angular momentum (OAM). Various schemes of production of the twisted photons have been proposed recently. The undulators and free electron lasers are used in these schemes. High energy twisted photons can also be generated by parti-cles channeled in aligned crystals.
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In our previous work We described planar channeling... -
Mykola Maksyuta05/06/2023, 18:20poster
Using the energy levels and corresponding wave functions found for hexagonal crystals of Be, Sc, Ti, Co, Zn, Y, Zr, Ts, Ru, Cd, and La, the spectra of channeled spontaneous radiation are calculated in the dipole approximation for nondispersive relativistic positron beams moving at zero angles with respect to the c-axes. Analysis of the dependencies shows that the intensity maxima of spectral...
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