[en] Short note. 3 refs

[en] Observation of quasi-Cherenkov radiation of 4.5 GeV electrons from diamond crystal planes (110) is reported. Increase of photon emission depending on the crystal thickness is detected

[en] The data of experimental investigations of spectral distribution and integral yield of 4.5-GeV electron radiation in piezoelectric quartz, lithium niobate and cadmium sulphide crystals of different thickness for axial and planar channeling are reported. 9 refs.; 8 figs.; 1 tab

[en] A two-arm experimental setup for the investigation of polarization phenomena in photoproduction reactions on hydrogen is described. By means of the described setup the energy dependence of Psub(x)sup(45 deg)-component of the recoil proton polarization vector is measured in the reaction νp → pπ₀ in the range Esub(ν)=(0.8+1.50) GeV for the pion angle in C-system THETA*sub(π)=60 deg, when the ν-quanta polarization vector composes with the reaction plane 45 deg

[en] An experimental installation is described, by means of which the spectral characteristics of radiation at axial and planar channeling in a 1 mm thick diamond crystal on an extracted 4.5 GeV electron beam are described. The measurements have been carried out by both, a wide-aperture pair magnetic spectrometer (PMS) and a full-absorption NaJ(Tl) spectrometer. The structure characteristics of the wide-aperture PMS composed of a SP-57 magnet and multiwire proportional chambers dislocated along the poles are descibed. The gamma-quanta are registered in the energy range from 30 to 1000 MeV at the magnet's current of 50 and 150 A. The radiation spectrum at axial channeling is compared to the analogous spectrum obtained by means of the NaJ(Tl) detector. 3 refs.; 3 figs

[en] A two-arm unit is described which is intended for studying photoproduction of π deg (eta) - mesons with polarized photons. Quantitative characteristics of the unit are given. The unit has been used for measuring assymetry of π deg -meson photoproduction section for Eγ=(0.8-1.3) Gev energy with THETAγπ angle in a C-system equalling 60 deg

[en] A wide-aperture magnetic pair spectrometer (MPS) used to obtain the spectral characteristics of radiation in planar and axial channeling of electrons of the Yerevan synchrotron extracted beam is described. The design and characteristics of the wide-aperture MPS consisting of the SP-57 magnet and multiwire proportional chambers located along the magnet poles are described. From 30 to 1000 MeV gamma quanta are registered at the magnet current of 50 and 150 A. The results of measurements carried out for axial channeling of 4.5 GeV electrons on a 1 mm thick diamond crystal are also presented. The emission spectrum obtained by means of the MPS is compared with that measured by a NaI(Tl) detector. 3 refs.; 9 figs

[en] An experimental setup allowing one to measure the Px, Py, Pz components of the polarization vector of protons with energy 150-300 MeV is described. All the components of the recoil proton polarization vector in γp → pπ0 reaction, at the π0 meson production cms angle Θπ0*=60 deg in the photon energy range of 875-1175 MeV, have been measured by the setup described. 12 refs.; 8 figs.; 1 tab

[en] The results of experimental investigations of the emission spectrum characteristics at axial and planar channeling of 2 and 3.5 GeV electrons on a 1 mm-thick diamond crystal are presented. The specifications of the experimental set-up, the logics of data gathering and processing are also given. It follows from the experimental data, that the emission intensity under the peak, in the energy range from 25 to 220 MeV at an axial channeling of 2 GeV electrons is about 2.6 times lower than in the case with 4.5 GeV electrons. The characteristic emission frequencies differ by about 5 times, the intensity at the peak -about 1.6 times. 4 refs.; 4 figs.; 1 tab

[en] A channel with a beam small angular divergence designed for experiments on the investigation of interactions of high energy electrons with single crystals is described. Characteristics of the channel main components are presented. Results of the beam profile measurements are compared to those of computer calculations. The electron beam divergence is estimated to be 5x10^-5 rad