The zero angle production of light nuclei has been studied in CC-interactions at beam energy 20.5 GeV/n on accelerator U-70. The measurements were performed with employing of the beamline no. 22 as ...spectrometer of secondary particles with verying its rigidity from 10 to 70 GeV/c. We observed secondary protons and deuterons with momenta above kinematic limit of NN-interactions. The measured dependence of forward yields on momentum are compared with the model predictions in the framework of Geant4. The models more or less correctly give positions of maxima of the distributions and their general qualitative dependence on the momentum. But in the quantitative predictions of the yields there are significant differences with the experiment which grow with increase of atomic mass number A.
Database on the extraction of zirconium and technetium, present separately and simultaneously, into 30% TBP is presented. With increasing temperature, the distribution ratio of Zr without Tc ...increases, and that of Tc without Zr decreases; however, because of the coextraction, the temperature dependence of the distribution ratios of these elements, present simultaneously, is leveled off. In the presence of uranyl nitrate, the effect of Tc on the extraction of Zr is preserved, whereas the effect of Zr on the extraction of Tc decreases to fully disappear in the case of the solvent saturation with uranyl nitrate. The interactions in the system are described within the framework of a new approach to modeling using five additional chemical equations. Their apparent equilibrium constants and coefficients of the temperature dependence are determined. The temperature coefficients are determined for the constants of six previously introduced equations of the extraction of zirconium and technetium, including the extraction in the presence of uranyl nitrate.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The kinetic regularities of the dissolution of sulfur in tetrachloroethylene (TCE), which depend on the temperature, hydrodynamic conditions, and TCE concentration, are presented. Using the rotating ...disc method, it is revealed that this process occurs in a mixed mode; its diffusion and kinetic components are revealed. The reaction order of the kinetic component of the dissolution rate of sulfur by TCE is 1.5, while the experimental activation energy of the process is 39.2 ± 2.0 kJ/mol. The activation energy of the diffusion component of the convective mass transfer during the dissolution of sulfur in TCE is 28.0 ± 2 kJ/mol.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The electronic and crystal structures of SrMgF
4
single crystals grown by the Bridgman method have been investigated. The undoped SrMgF
4
single crystals have been studied using low-temperature (
T
= ...10 K) time-resolved fluorescence optical and vacuum ultraviolet spectroscopy under selective excitation by synchrotron radiation (3.7–36.0 eV). Based on the measured reflectivity spectra and calculated spectra of the optical constants, the following parameters of the electronic structure have been determined for the first time: the minimum energy of interband transitions
E
g
= 12.55 eV, the position of the first exciton peak
E
n
= 1 = 11.37 eV, the position of the maximum of the “exciton” luminescence excitation band at 10.7 eV, and the position of the fundamental absorption edge at 10.3 eV. It has been found that photoluminescence excitation occurs predominantly in the region of the low-energy fundamental absorption edge of the crystal and that, at energies above
E
g
, the energy transfer from the matrix to luminescence centers is inefficient. The exciton migration is the main excitation channel of photoluminescence bands at 2.6–3.3 and 3.3–4.2 eV. The direct photoexcitation is characteristic of photoluminescence from defects at 1.8–2.6 and 4.2–5.5 eV.
Possible ways of Tc and Np localization within the framework of the first extraction cycle of the Purex process are considered. Experimental data are presented on Tc localization in the high-level ...raffinate as applied to the RT-1 flowsheet, in the zirconium-tritium strip, and in the Pu-Np product or in the scrub from the unit of the barrier reductive scrubbing of the uranium solvent product as applied to six-unit extraction scheme in the design of the Experimental and Demonstration Center. For the latter case, the possibility of Np localization before and after Pu stripping was also examined.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
38.
A Test Setup for Scintillation Counters Korneev, Yu. P.; Krinitsyn, A. N.; Kryshkin, V. I. ...
Instruments and experimental techniques (New York),
11/2004, Volume:
47, Issue:
6
Journal Article
Peer reviewed
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The transverse single-spin asymmetry was measured for charged hadrons ({pi}{sup {+-}}, K{sup {+-}}, p, p-bar) produced in proton-nucleus collisions. The measurements were performed with the aid of ...the FODS-2 spectrometer by using a 40-GeV polarized proton beam from the accelerator of the Institute for High Energy Physics (IHEP, Protvino) and carbon and copper nuclear targets. The data subjected to the analysis in the present study were obtained for c.m. angles in the range 95{sup o}-112{sup o} in the vicinity of the central region (-0.08 < x{sub F} < -0.06, 0.7 < p{sub T} < 3.4 GeV/c). The analyzing power is found to be only slightly dependent on the mass number of the target nucleus. The basic results obtained by measuring the single-spin asymmetry at three values of the particle-detection angle are discussed.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Single-spin asymmetries for hadrons have been measured in collisions of a transversely polarized 40
GeV/
c proton beam with an unpolarized liquid hydrogen target. The asymmetries were measured for
π
...±,
K
±, protons and antiprotons, produced in the central region (0.02 ⩽
x
F
⩽ 0.10 and 0.7 ⩽
p
T
⩽ 3.4
GeV/
c). Asymmetries for
π
±,
K
± and p̄ show, within measurement errors, a linear dependence on
x
T
and change sign near 0.37. For protons, a negative asymmetry, independent of
x
T
, has been found. The results are compared with those of other experiments and SU(6) model predictions.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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