[en] We report new measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, G_Eⁿ/G_Mⁿ, obtained via recoil polarimetry from the quasielastic ²H((rvec e), e(prime)(rvec n))¹H reaction at Q² values of 0.45, 1.13, and 1.45 (GeV/c)² with relative statistical uncertainties of 7.6 and 8.4% at the two higher Q² points, which were not reached previously via polarization measurements. Scale and systematic uncertainties are small

[en] A method for studying the characteristics of laser-induced ablative acceleration of thin foils is described. The method is based on the electrocontact measurement of the time of foil flight through base distances in the air atmosphere. Results of experiments on the laser acceleration of foils in cylindrical and conical channels for laser radiation intensities up to 2x10¹¹ W cm^-2 are presented. The results obtained were used in experiments to determine the split-off strength of aluminium targets at high strain rates, the accelerated aluminium foils being used as strikers. (special issue devoted to the 25th anniversary of the a.m. prokhorov general physics institute)

[en] In this paper, a review of the most important results of the experimental studies of thermonuclear plasma in conical targets, the generation of shock waves and of spallation phenomena in different materials is presented, all of which have been carried out at the laser facilities of the A M Prokhorov General Physics Institute RAS since 1977. (paper)

[en] Experiments for verification of a functional dependence of the ablation pressure on the irradiated surface of a target upon the laser intensity in a range from 1.2 to 350 TW/cm² have been carried out. For that, at some intensities of the laser irradiation, time intervals between the laser pulse maximum and the moment of the shock-wave front arrival to the rear surface of the target were measured, which are dependent on the ablation pressure. Two schemes of the measurements were used. At the first scheme, at higher laser intensities, the front arrival moment is determined via an electron-optical camera when the rear surface begins glowing. At the second scheme, the front arrival moment is recorded when a probe laser pulse changes the character of the reflection by the rear surface of the irradiated target. Results of measurements are in agreement with the ablation pressure dependence upon the laser pulse intensity within 20%. (paper)

[en] Data on the tensor and vector analyzing powers (A_yy and A_y, respectively) in the fragmentation of a 9-GeV/c deuteron on hydrogen and carbon nuclei at high proton transverse momenta are presented. These data are compared with the results of relevant calculations performed within light-front dynamics by using various deuteron wave functions. The best description of the data is attained with the relativistic deuteron wave function derived within field-theory light-front dynamics.

[en] Data on the tensor and vector analyzing powers (A_yy and A_y, respectively) in the fragmentation of a 9-GeV/c deuteron on hydrogen and carbon nuclei at high proton transverse momenta are presented. These data are compared with the results of relevant calculations performed within light-front dynamics by using various deuteron wave functions. The best description of the data is attained with the relativistic deuteron wave function derived within field-theory light-front dynamics

[en] The spallation phenomena in poly- and single-crystal synthetic diamonds have been experimentally investigated. A shockwave impact on a target was implemented using a 70-ps laser pulse in the Kamerton-T facility. The ablation pressure of 0.66 TPa on the front target surface was formed by pulsed radiation of a neodymium phosphate glass laser (second harmonic λ = 0.527 mm, pulse energy 2.5 J) with an intensity as high as 2 × 10¹³ W cm^-2. The maximum diamond spall strength σ* ≈ 16.5 GPa is found to be 24% of the theoretical ultimate strength. Raman scattering data indicate that a small amount of crystalline diamond in the spallation region on the rear side of the target is graphitised. (extreme light fields and their applications)

[en] We present the results of experiments on the spallation phenomena in graphite targets under shock-wave nano- and picosecond irradiation, which have been performed on Kamerton-T (GPI, Moscow, Russia) and PHELIX (GSI, Darmstadt, Germany) laser facilities. In the range of the strain rates of 10"6 – 10"7 s"-"1, the data on the dynamic mechanical strength of the material at rapure (spallation) have been for the first time obtained. With a maximal strain rate of 1.4 × 10"7 s"-"1, the spall strength of 2.1 GPa is obtained, which constitutes 64% of the theoretical ultimate tensile strength of graphite. The effect of spallation is observed not only on the rear side of the target, but also on its irradiated (front) surface. With the use of optical and scanning electron microscopes, the morphology of the front and rear surfaces of the targets is studied. By means of Raman scattering of light, the graphite structure both on the target front surface under laser exposure and on its rear side in the spall zone is investigated. A comparison of the dynamic strength of graphite and synthetic diamond is performed. (extreme light fields and their applications)

[en] The average time resolution (σ) of about 70 ps is obtained for each of four scintillation counters at a long duration test on the CERN SPS particle beam. The counters were assembled of 2.4 x 2.4 x 6.0 cm³ scintillator bars and FEU-87 (CsSb) type photomultipliers, both made in Russia. We observed the non-stability of mean time-of-flight (TOF) value during the runs. The maximum TOF drift contribution into the time resolution is estimated as (10-15 %)

[en] The angular dependence of the tensor A_yy and vector A_y analyzing powers in the inelastic scattering of deuterons with a momentum of 9.0 GeV/c on hydrogen and carbon has been measured. The range of measurements corresponds to the baryonic resonance excitation with masses of ∼2.2-2.6 GeV/c². The A_yy data, being in good agreement with the previous results, demonstrate an approximate t scaling up to -1.5 (GeV/c)². The large values of A_y show a significant role of the spin-dependent part of the elementary amplitude of the NN ^→ NN* reaction. The results of the experiment are compared with model predictions of the plane-wave impulse approximation