Exotic meson decay to omegapi0pi-

A partial-wave analysis of the mesons from the reaction pi(-)p --> pi(+)pi(-)pi(-)pi(0)pi(0)p has been performed. The data show b(1)pi decay of the spin-exotic states pi(1)(1600) and pi(1)(2000). Three isovector 2(-+) states were seen in the omegarho(-) decay channel. In addition to the well known pi(2)(1670), signals were also observed for pi(2)(1880) and pi(2)(1970).     

Resonances in the ωω system

Results of a partial-wave analysis for the reaction π ^? → ωωn studied at the VES spectrometer (Institute for High Emergy Physics, Protvino) are presented. The behavior of the J ^PC = 2⁺⁺ amplitudes in the ωω system is described by the f ₂(1565) and f ₂(1910) resonances, whose parameters were fixed at M = 1.590 ± 0.010 GeV and Γ = 0.140 ± 0.011 GeV for the former and at M = 1.890 ± 0.010 GeV and Γ = 0.165 ± 0.019 GeV for the latter. The decay f ₄(2050) → ωω was observed at parameters values of M = 1.960 ± 0.015 GeV, Γ = 0.290 ± 0.020 GeV.     

Multicomponent vacuum-arc ion beams

The paper generalizes the results of research on pulsed-periodic generation of multicomponent ion streams in sources based on vacuum arc discharge. Methods are considered for forming composition-and-energy controlled multicomponent beams for multielement ion implantation in Raduga sources. The features and laws governing the emission properties of wide-aperture ion sources with plasma generation by evaporation of a material in a cathode spot are discussed. A comparative analysis is made of the physical laws and possibilities of forming one-element or multielement ion beams during extraction from a free plasma boundary under conditions when a virtual anode exists and a positive voltage drop near the anode exists in the vacuum-arc-discharge plasma.Scientific-Research Institute of Nuclear Physics at the Tomsk Polytechnical University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 34–52, March, 1994.     

High-intensity ion implantation - a technique to form finely dispersed intermetallic compounds in surface layers of metals

The results of experimental investigations of microstructure and phase composition of surface ion-alloyed layers of nickel, titanium, and iron formed under the conditions of high-intensity aluminum-ion implantation are presented. It is established that aluminum-ion implantation under high-intensity modes makes it possible to form finely-dispersed intermetallic phases of Me₃Al (Me = Ni, Ti, Fe) and MeAl (Ni, Ti), as well as solid solutions of a composition variable with respect to depth in the surface layers measuring up to 2000 nm. It is shown that the average grain-size of intermetallic phases formed in ion-alloyed layers is 20–80 nm. Regions of localization of the phases thus formed over the implanted layer depth are determined.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 44–52, September 2004.     

Changes in the structure of cell wall polymers in thermomechanical treatment of highly lignified plant feedstock

The effect of mechanical treatment at various temperatures on structural changes in polymers contained in highly lignified plant feedstock was studied by the example of reed stems. The optimal conditions (about 10°C) of mechanical activation of plant feedstock were determined, under which its structure is disordered enough for subsequent enzymatic hydrolysis, but the lignin decomposition is prevented, and so is the formation of a layer of substances inhibiting enzymes on the surface of particles.     

Double electric layer influence on dynamic of EUV radiation from plasma of high-current pulse diode in tin vapor

Generation of high-power pulses of extreme ultraviolet radiation from multi-charged tin plasma is of great interest to many applications. We studied the electric potential distribution in the discharge gap in kind of the electric double layer and its effect on the extreme ultraviolet generation. The local plasma heating by electron beam, formed in the double layer, leads to generation of peak radiation pulses and as a result to an increase in the radiation power.     

Photoluminescence thermometry with alkyl‐terminated silicon nanoparticles dispersed in low‐polar liquids

Steady‐state and time‐resolved photoluminescence of silicon nanoparticles dispersed in low‐polar liquids at above room temperature is studied. The roles of low‐polar liquids as well as mechanisms responsible for their temperature‐dependent photoluminescence are discussed. The thermal sensitivity of the photoluminescence is estimated and application of the nanoparticles as nanothermometers is proposed.