The cross section for the reaction 7 + C -+e+ + e+ C has been measured for a series of kinematic points giving nuclear momentum transfers in the region 0.2 0.7 F -2 , with incident -photon energies in the region for photoproduction of the first two pi-nucleon resonances. Measurements were made, using asymmetric detection geome-try, of e3.ectron and positron cross sections for each point. The ch...

Introduction: Background: Radiotherapy of parotid tumors is achieved by different radiotherapy techniques. So they deliver the dose to organs at risk such as contralateral parotid, temporal lobe & spinal cord. The consequences of high dose to OARs are xerostomia, Temporal lobe necrosis and loss of hearing. Purpose: The aim of this study was to compare different treatment tech...

As a rst approximation, a metal can be modelled as an electron gas. A non-interacting electron gas has a continuous spectrum of electron-hole pair excitations. At each wavevector ~ Q with j~ Qj less than the maximum Fermi surface spanning vector (2kF ) there is a continuous set of electron-hole pair states, with a maximum energy but no gap (the minimum energy is zero.) Once the Coulomb interact...

We show that the pair spin–orbit interaction (PSOI) created by Coulomb fields of interacting electrons leads to appearance an unconventional correlated electronic state in two-dimensional materials with large Rashba effect. The effect manifests itself at sufficiently strong PSOI as a sharp peak structure factor, indicating tendency form striped spatial scale determined competition between repul...

Abstract The thermodynamic properties of electron gas under the extreme conditions high temperature, matter density, and/or a strong magnetic field largely determine behavior in upper layers neutron stars and accretion columns magnetized binary systems. A these objects makes motion electrons across essentially quantum. possible degeneracy relativism are also important. When studying onto magnet...

The process of radiation from high-energy electron and electron-positron pair production by a photon in oriented single crystal is considered using the method which permits inseparable consideration of both coherent and incoherent mechanisms of photon emission from an electron and of pair creation by a photon and includes the action of field of axis (or plane) as well as the multiple scattering...