First Measurement of Proton-Proton Elastic Scattering at RHIC

The first result of the pp2pp experiment at RHIC on elastic scattering of polarized protons at sqrt{s} = 200 GeV is reported here. The exponential slope parameter b of the diffractive peak of the elastic cross section in the t range 0.010 <= |t| <= 0.019 (GeV/c)^2 was measured to be b = 16.3 +- 1.6 (stat.) +- 0.9 (syst.) (GeV/c)^{-2} .Comment: 9 pages 5 figure

Interference between Diffraction Radiation and a Scattered Plane Wave as a Possible Source of Information about Properties of a Surface

AbstractWe investigate a possibility of an interference of diffraction radiation with a field, originated from scattering of refracted on a non-uniform surface electromagnetic wave in a case of total internal reflection. An effect of the field from fast charged particle and the refracted field on surface inhomogeneities gives rise to emergence of surface polarization currents. Radiation from these currents can be of use in analysis of surface optical features. The opportunity of studying of surface characteristics by means of diffraction radiation and total internal reflection of the electromagnetic wave is discussed in this paper

Field-dependent Transport Level and Mobility in Disordered Organics

AbstractAn analytic description of electric field and temperature dependences of mobility is developed on the base of extended transport level concept in the framework of Gaussian disorder model, providing low concentration of charge carriers. Field-dependent percolation factor was used in an equation for transport level. Results are in good agreement with well-known Monte Carlo simulations at weak and moderate electric field strength (up to 106V/cm at typical parameters), providing that energetically upward jumps still dominate conductivity. It is enough for most applications in organic electronics. Concentration dependence of a transport level is discussed

Analytical and Numerical Calculation of Transition Radiation from Graphene Monolayer

AbstractBoth theoretical and numerical analysis of transition radiation from graphene monolayer is performed. The source of transition radiation is polarization currents excited by a charged particle, uniformly moving through the monolayer. By means of the perturbation theory, we obtain expressions of spectral-angular density of the radiation in cases of normal and oblique incidences. The conditions of applicability of the obtained expressions are demonstrated, as well as the characteristic features of the behavior of the spectral-angular density of the radiation. The conditions when the radiation is directed along the monolayer are found. The results of numerical calculations for an arbitrary shape of the monolayer are discussed