α + 12C scattering at 110 MeV: Has exotic 7.65 MeV Hoyle’s state signatures “alpha-condensate” structure?

We present new measurements of the α + ¹²C elastic and inelastic (to the states 4.44, 7.65, and 9.64 MeV) scattering at E _lab = 110 MeV in the wide angular range from ～10° to 175°, which enable us to examine the condensate and cluster properties of the low-lying excited states in ¹²C. We present the diffraction-radius analysis of our data together with a considerable amount of the existing data. The magnitudes of the diffraction radii for the ground and the first excited (4.44 MeV) states are found to be equal, whereas they appear to be enhanced by ～0.6 fm both for 7.65 and 9.64 MeV states. This result shows that the radius of the Hoyle’s 0 ₂ ⁺ , 7.65 MeV state in ¹²C is by a factor of ～1.2–1.3 larger than that of the ground state. It is demonstrated that the direct transfer mechanism of ⁸Be dominates at the largest angles in all four reactions reported here. The configuration corresponding to the transfer of ⁸Be in its ground state (I ^π = 0⁺) with L = 0 turns out to be the most important for the 7.65 MeV state of ¹²C. Evidence of existence of some features of α-condensed structure of the Hoyle’s 0 ₂ ⁺ state in ¹²C was obtained: its enhanced radius and large contribution of α-particle configuration with L = 0.     

Plasma-chemical and hydrometallurgical processes for the synthesis of nanostructures from natural crystalline graphite

A flow chart for the extraction of high-purity (99.98%) crystalline graphite by hydrometallurgical methods from the high-carbon rocks of the Ruzhinskaya area was developed. The graphite was used as the starting material for plasma-chemical tests. Nano-sized carbon nanomaterials were isolated upon the experiment. Some of them could be inherited from the natural graphite-bearing rocks. The results of investigation will be used in the development of resource-saving process for extraction of useful components.     

Control of the self-assembly processes in a droplet of a colloidal solution by an acoustic field

The formation of structured films consisting of ensembles of micro- or nanoparticles and possessing preset functional characteristics is studied both experimentally and theoretically. The films are obtained by drying out droplets of colloidal solutions on a solid substrate under the acoustic effect produced by a standing SAW field.     

Electrical and electroluminescent properties of InAsSb-Based LEDs (λ = 3.85–3.95 μm) in the temperature interval 20–200°C

The temperature dependences of the electrical and electroluminescent properties of InAsSbP/InAsSb/InAsSbP heterostructure LEDs (λ ≈ 3.8−4.0 μm) are studied in the temperature interval 20–200°C. It is shown that the radiation power decreases with increasing temperature in a superexponential manner and that this decrease is associated primarily with a rise in the rate of Auger recombination. The position of the maximum in the radiation spectrum varies with temperature nonmonotonically, since radiative recombination is observed both in the active region and in the wide-gap layer. At room temperature, current through the heterostructure is tunneling current irrespective of the applied voltage polarity. As the temperature rises, either the thermal emission of charge carriers appears (direct bias) or the diffusion current becomes significant (reverse bias).     

Calculation of the impurity distribution for diffusion in a solid crystal with inhomogeneous layers

A solution is obtained for the diffusion from a constant source at a surface in a solid crystal with an inhomogeneity in the form of a layer with high diffusion coefficient of arbitrary thickness. The expressions obtained may be used, depending on the choice of the inhomogeneous layer thickness, to investigate surface diffusion or diffusion at grain boundaries or dislocations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 104–108, October, 1977.     

Liquid crystal proton N.M.R. spectral analysis by numerical calculation

We offer an approximate method with which to calculate proton N.M.R. spectra generally caused by dipole-dipole interactions. The method consists of subdividing the spin system of the liquid crystal molecule into interacting blocks. The spectrum of each block is calculated exactly. The interaction between spins of different blocks is calculated approximately. The method is compared with the known methods using 4-n-pentyl-d₁₁-4'-cyanobiphenyl (5CB-d₁₁) and 4,4'-dimeth-oxyazoxybenzene (PAA) as examples.