Spatial distribution of Cherenkov light from cascade showers in water

The spatial distribution of the Cherenkov light generated by cascade showers is analyzed using the NEVOD Cherenkov water detector. The dependence of the Cherenkov light intensity on the depth of shower development at various distances from the shower axis is investigated for the first time. The experimental data are compared with the Cherenkov light distributions predicted by various models for the scattering of cascade particles.     

Simulation of Seismic Waves in Anisotropic Media

Doklady Mathematics - The problem of seismic wave propagation in a heterogeneous geological medium is considered. The dynamic behavior of the medium is described by the linear elastic system of...     

Role of very-high-energy muons in generation of penetrating cascades in the Pamir experiment

The question of processes responsible for some unusual events with the energy deposition over 100 TeV recorded in X-ray emulsion chambers (XECs) of the Pamir experiment is still open. Among the events of this type are penetrating cascades in deep lead XECs. The evaluations show that these events can be qualitatively explained by multiple interactions of muons with energies in the PeV range. In this work, the expected number of penetrating cascades induced in the Pamir XECs by very-high-energy muons is calculated for different muon generation processes in the atmosphere.     

Compton-effect on π−-meson

The reaction π^? A→Aπ^? γ at 40 GeV/c was studied on “Sigma” spectrometer on six different nuclear targets in the region of four-momentum transfer |t|<0.05 (GeV/c)². A phenomenon of elastic scattering of pions on the nuclear Coulomb field photons was observed, its total and differential cross sections were measured. The cross section of Compton effect on π^?-meson was measured.     

Coupling functions for muon hodoscopes

The specific features of calculating the coupling functions for muon hodoscopes are considered. The results of calculating the main coupling functions for three versions of the primary spectra of cosmic rays (CR)—galactic CR, solar CR during proton events, and galactic CR variations during Forbush decreases-are presented. The calculations have been performed based on modeling CR propagation through the Earth’s atmosphere using the CORSIKA code. The mean and median CR energies, contributing to the muon detector counting rate, have been calculated for different zenith angles. It has been shown that muon detectors are sensitive to different energies of primary CRs for different directions.     

Method for the formation of graphene films

A method is proposed to form graphene films using thermodiffusion of carbon atoms from an amorphous carbon or silicon-carbon film with a nanosized thickness through a catalyst film, their accumulation at the catalyst layer/barrier layer interface, and the subsequent carbon quasi-liquid-graphene phase transition. One of the advantages of this method of producing graphene films is the possibility of their formation directly on a dielectric layer and the subsequent suspension of a graphene film over the substrate surface using membrane technologies, which excludes the necessity of using complex procedures to separate a graphene film from the substrate.