Effect of Crystallization Front Shape on the Dislocation Density in Germanium Single Crystals

Crystallography Reports - The effect of crystallization front shape on the dislocation density in Ge single crystals with a diameter of 100 mm, grown by the Czochralski method, has been studied....     

Effect of the microstructure on electrical properties of high-purity germanium

The interrelation between the electrical properties and the microstructure of high-purity germanium crystals has been revealed. The electrical conductivity of polycrystalline samples increases and the life-time of nonequilibrium charge carriers in them decreases with a decrease in the crystallite sizes.     

Observation of the Independence of the p/π Ratio from the Nuclear Size for Hadrons Knocked out with Large Transverse Momenta from a Nuclear Target by 50-GeV Protons

JETP Letters - The yields of cumulative protons and π± mesons emitted at a laboratory angle of 40° from carbon and heavier nuclear targets irradiated by a proton beam from the U70...     

Program of polarization studies and capabilities of accelerating polarized proton and light nuclear beams at the nuclotron of the joint institute for nuclear research

A program of polarization studies is presented; this program can enhance our understanding of the constituents from which the spin of hadrons and lightest nuclei is constructed. Beams of polarized lightest nuclei at Nuclotron are required to complete this program. Calculations of linear resonance strengths at Nuclotron, which may result in depolarization effects, are presented. The application of a new method for conserving particle beam polarization at crossing these resonances at Nuclotron is discussed.     

Interaction between gaseous oxygen and germanium melt

Interaction between the residual gaseous oxygen and germanium melt is analyzed. There is a quantitative relationship between oxygen concentration in a growing germanium single crystal, oxygen partial pressure in an inert gas, and water vapor pressure in hydrogen. The suggested theoretical interpretation of the interaction between oxygen and germanium melt is experimentally validated.     

Measurement of the yields of positively charged particles at an angle of 35° in proton interactions with nuclear targets at an energy of 50 GeV

Momentum spectra of cumulative particles in the region of high transverse momenta (P _T ) in pA → h ⁺ + X reactions were obtained for the first time. The experiment in which this was done was performed at the SPIN setup (Institute for High Energy Physics, Protvino) in a beam of 50-GeV protons interacting with C, Al, Cu, and W nuclei. Positively charged particles were detected at a laboratory angle of 35° and in the transverse-momentum range between 0.6 and 3.7 GeV/c. A strong dependence of the particle-production cross section on the atomic number was observed. A comparison with the results of calculations based on the HIJING and UrQMD models was performed in the subcumulative region.     

Nonmonotonic motion of a meniscus in asymmetric scale transformation theory

Experimental data on the nonmonotonic motion of a meniscus in the precritical region, obtained by the method of neutron transmission, are explained on the basis of extended expansions in the inverse correlation radius within the framework of asymmetric scale transformation theory.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 93–97, December, 1976.     

Nitriding of steel and titanium surface layers under the action of compression plasma flows

The elemental and phase compositions of St3 steel and VT1-0 titanium surface layers nitrided by the action of compression plasma flows (CPFs) have been investigated. The plasma flow parameters are shown to be correlated with the modified-layer nitrogen content. The basic mechanism by which the steel and titanium surface layers are saturated with nitrogen has been revealed. The performed experiments indicate that an increase in the absorbed energy density leads to a decrease in the nitrogen concentration because a shock-compressed layer is formed in the near-surface region, impeding nitrogen diffusion into the sample. The higher nitrogen concentration of surface layers treated by CPFs is achieved by increasing the pressure of the residual nitrogen atmosphere. It has been established that γ_N-Fe nitrous austenite, α″-Fe(N) and α′-Ti(N) martensitic phases, and γ′-Fe₄N and δ-TiN _x nitrides can be produced by nitriding the surface layers of St3 steel and VT1-0 titanium.