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Search Results: 1 - 10 of 461841 matches for " A. A. Khaustov "
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First Record of Mites of the Family Stigmaeidae (Acari, Raphignathoidea) from Rovno Amber with Description of a New Species of the Genus Mediolata
N. N. Kuznetsov, A. A. Khaustov, E. E. Perkovsky
Vestnik Zoologii , 2010, DOI: 10.2478/v10058-010-0037-3
Abstract: A new species, Mediolata eocenica Kuznetsov, Khaustov et Perkovsky, sp. n., is described from the Late Eocene Rovno amber. It is the first fossil record of Stigmaeidae.
Checklist of oribatid mites from “Cape Martyan” Nature Reserve (Ukraine), with redescription of Paralopheremaeus hispanicus (Ruiz, Kahwash and Subías, 1990) and description of Ctenobelba martyanensis sp. nov. (Acari: Oribatida)
Ermilov, S.G.,Khaustov, A.A.,Wu, D.
Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis , 2012,
Abstract: An annotated checklist of oribatid mite taxa (85 species, 72 genera, 41 families) in “Cape Martyan” Nature Reserve (Ukraine) is provided. Paralopheremaeus hispanicus (Ruiz, Kahwash & Subías, 1990) is redescribed in details. Ctenobelba martyanensis sp. nov. is described and illustrated. The new species can be distinguished from all representatives of the genus by having very widely dilated notogastral setae
Measurement of the $\eta$ -$\eta'$ mixing angle in $\pi^{-}$ and $K^{-}$ beams with GAMS-$4\pi$ Setup
Donskov, S. V.;Kolosov, V. N.;Lednev, A. A.;Mikhailov, Yu. V.;Polyakov, V. A.;Samoylenko, V. D.;Khaustov, G. V.
High Energy Physics - Phenomenology , 2013,
Abstract: The results of mixing angle measurement for $\eta'$, $\eta$ mesons generated in charge exchange reactions with $\pi^{-}$ and $K^{-}$ beams are preseneted. When the $\eta'$, $\eta$ mesons are described in nonstrange(NS)--strange(S) quark basis the $\pi^{-}$ and $K^{-}$ beams allow to study $|\eta_{q}>$ and $|\eta_{s}>$ parts of the meson wave function. The cross section ratio at $t'=0$ (GeV/c)$^{2}$ in the $\pi^{-}$ beam is $R_{\pi}(\eta'/\eta)= 0.56 \pm 0.04$, results in mixing angle $\phi_{P} = (36.8 \pm 1.)^{o} $. For $K^{-}$ beam the ratio is $R_{K}(\eta'/\eta)= 1.30 \pm 0.16$. It was found that gluonium content in $\eta'$ is $\sin^{2}\psi_{G}= 0.15 \pm 0.06$. The experiment was carried out with GAMS-4$\pi$ Setup.
Measurement of the $η$ -$η'$ mixing angle in $π^{-}$ and $K^{-}$ beams with GAMS-$4π$ Setup
S. V. Donskov,V. N. Kolosov,A. A. Lednev,Yu. V. Mikhailov,V. A. Polyakov,V. D. Samoylenko,G. V. Khaustov
Physics , 2013, DOI: 10.1140/epjc/s10052-013-2614-4
Abstract: The results of mixing angle measurement for $\eta'$, $\eta$ mesons generated in charge exchange reactions with $\pi^{-}$ and $K^{-}$ beams are preseneted. When the $\eta'$, $\eta$ mesons are described in nonstrange(NS)--strange(S) quark basis the $\pi^{-}$ and $K^{-}$ beams allow to study $|\eta_{q}>$ and $|\eta_{s}>$ parts of the meson wave function. The cross section ratio at $t'=0$ (GeV/c)$^{2}$ in the $\pi^{-}$ beam is $R_{\pi}(\eta'/\eta)= 0.56 \pm 0.04$, results in mixing angle $\phi_{P} = (36.8 \pm 1.)^{o} $. For $K^{-}$ beam the ratio is $R_{K}(\eta'/\eta)= 1.30 \pm 0.16$. It was found that gluonium content in $\eta'$ is $\sin^{2}\psi_{G}= 0.15 \pm 0.06$. The experiment was carried out with GAMS-4$\pi$ Setup.
A search for decay $η' \rightarrow 4 π^{0}$ with GAMS-$4π$ Setup
S. V. Donskov,V. N. Kolosov,A. A. Lednev,Yu. V. Mikhailov,V. A. Polyakov,V. D. Samoylenko,G. V. Khaustov
Physics , 2014, DOI: 10.1142/S0217732314502137
Abstract: A search for rare decay $\eta' \rightarrow 4 \pi^{0}$ has been performed with GAMS-4$\pi$ Setup. The new upper limit for decay was established $BR(\eta' \rightarrow 4 \pi^{0}) < 3.2 \cdot 10^{-4}$ at 90\% confidence level. The $\pi^{-} p$ charge-exchange reaction at 32.5 GeV/c was used as a source of $1.3\cdot 10^{6}$ $ \eta'$ mesons. Experiment carried out at the IHEP U-70 accelerator.
Study of the $ηπ^o$ system in the mass range up to 1200 MeV
D. Alde,F. G. Binon,M. Boutemeur,C. Bricman,S. V. Donskov,M. Gouanere,A. V. Inyakin,S. Inaba,V. A. Kachanov,G. V. Khaustov,E. A. Knapp,A. A. Kondashov,A. A. Lednev,V. A. Lishin,J. P. Peigneux,M. Poulet,Yu. D. Prokoshkin,S. A. Sadovsky,V. D. Samoylenko,P. M. Shagin,A. V. Singovsky,A. E. Sobol,J. P. Stroot,V. P. Sugonyaev,K. Takamatsu,T. Tsuru
Physics , 1997, DOI: 10.1063/1.56089
Abstract: The reaction $\pi^-p \to \eta\pi^o n$ has been studied with GAMS-2000 spectrometer in the secondary 38 GeV/c $\pi^-$-beam of the IHEP U-70 accelerator. Partial wave analysis of the reaction has been performed in the $\eta\pi^o$ mass range up to 1200 MeV. The $a_0(980)$-meson is seen as a sharp peak in S-wave. The $t$-dependence of $a_0(980)$ production cross section has been studied. Dominant production of the $a_0(980)$ at a small transfer momentum $t$ confirms the hypothesis of Achasov and Shestakov about significant contribution of the $\rho_2$ exchange ($I^GJ^{PC}=1^+2^{--}$) in the mechanism of $a_0(980)$ meson production in $t$-channel of the reaction.
Evidence of Xi hypernuclear production in the ^{12}C(K^-,K^+)^{12}_{Xi}Be reaction
P. Khaustov,D. E. Alburger,P. D. Barnes,B. Bassalleck,A. R. Berdoz,A. Biglan,T. Buerger,D. S. Carman,R. E. Chrien,C. A. Davis,H. Fischer,G. B. Franklin,J. Franz,L. Gan,A. Ichikawa,T. IijIma,K. Imai,Y. Kondo,P. Koran,M. Landry,L. Lee,J. Lowe,R. Magahiz,M. May,R. McCrady,C. A. Meyer,F. Merrill,T. Motoba,S. A. Page,K. Paschke,P. H. Pile,B. Quinn,W. D. Ramsay,A. Rusek,R. Sawafta,H. Schmitt,R. A. Schumacher,R. W. Stotzer,R. Sutter,F. Takeutchi,W. T. H. van Oers,K. Yamamoto,Y. Yamamoto,M. Yosoi,V. J. Zeps
Physics , 1999, DOI: 10.1103/PhysRevC.61.054603
Abstract: The E885 collaboration utilized the 1.8 GeV/c K^- beam line at the AGS to accumulate 3 x 10^5 (K^-,K^+) events. Xi hypernuclear states are expected to be produced through the reaction K^- + ^{12}C -> K^+ + ^{12}_{Xi}Be. The measured missing-mass spectrum indicates the existence of a signal below the threshold for free Xi production. Although the resolution was not sufficient to resolve discrete hypernuclear states, the excess of events in the region of missing mass, kinematically inaccessible in free Xi production, is compared to theoretical prediction for ^{12}_{Xi}Be production.
Measurement of Spin Transfer Observables in Antiproton-Proton -> Antilambda-Lambda at 1.637 GeV/c
B. Bassalleck,A. Berdoz,C. Bradtke,R. Br?ders,B. Bunker,H. Dennert,H. Dutz,S. Eilerts,W. Eyrich,D. Fields,H. Fischer,G. Franklin,J. Franz,R. Gehring,R. Geyer,S. Goertz,J. Harmsen,J. Hauffe,F. H. Heinsius,D. Hertzog,T. Johansson,T. Jones,P. Khaustov,K. Kilian,P. Kingsberry,E. Kriegler,J. Lowe,A. Meier,A. Metzger,C. A. Meyer,W. Meyer,M. Moosburger,W. Oelert,K. D. Paschke,M. Plückthun,S. Pomp,B. Quinn,E. Radtke,G. Reicherz,K. R?hrich,K. Sachs,H. Schmitt,B. Schoch,T. Sefzick,F. Stinzing,R. Stotzer,R. Tayloe,St. Wirth
Physics , 2002, DOI: 10.1103/PhysRevLett.89.212302
Abstract: Spin transfer observables for the strangeness-production reaction Antiproton-Proton -> Antilambda-Lambda have been measured by the PS185 collaboration using a transversely-polarized frozen-spin target with an antiproton beam momentum of 1.637 GeV/c at the Low Energy Antiproton Ring at CERN. This measurement investigates observables for which current models of the reaction near threshold make significantly differing predictions. Those models are in good agreement with existing measurements performed with unpolarized particles in the initial state. Theoretical attention has focused on the fact that these models produce conflicting predictions for the spin-transfer observables D_{nn} and K_{nn}, which are measurable only with polarized target or beam. Results presented here for D_{nn} and K_{nn} are found to be in disagreement with predictions from existing models. These results also underscore the importance of singlet-state production at backward angles, while current models predict complete or near-complete triplet-state dominance.
Experimental determination of the complete spin structure for anti-proton + proton -> anti-Λ+ Λat anti-proton beam momentum of 1.637 GeV/c
The PS185 collaboration,K . D. Paschke,B. Quinn,A. Berdoz,G. B. Franklin,P. Khaustov,C. A. Meyer,C. Bradtke,R. Gehring,S. Goertz,J. Harmsen,A. Meier,W. Meyer,E. Radtke,G. Reicherz,H. Dutz,M. Pluckthun,B. Schoch,H. Dennert,W. Eyrich,J. Hauffe,A. Metzger,M. Moosburger,F. Stinzing,St. Wirth,H. Fischer,J. Franz,F. H. Heinsius,E. Kriegler,H. Schmitt,B. Bunker,D. Hertzog,T. Jones,R. Tayloe,R. Broders,R. Geyer,K. Kilian,W. Oelert,K. Rohrich,K. Sachs,T. Sefzick,B. Bassalleck,S. Eilerts,D. E. Fields,P. Kingsberry,J. Lowe,R. Stotzer,T. Johansson,S. Pomp
Physics , 2006, DOI: 10.1103/PhysRevC.74.015206
Abstract: The reaction anti-proton + proton -> anti-\Lambda + \Lambda -> anti-proton + \pi^+ + proton + \pi^- has been measured with high statistics at anti-proton beam momentum of 1.637 GeV/c. The use of a transversely-polarized frozen-spin target combined with the self-analyzing property of \Lambda/anti-\Lambda decay allows access to unprecedented information on the spin structure of the interaction. The most general spin-scattering matrix can be written in terms of eleven real parameters for each bin of scattering angle, each of these parameters is determined with reasonable precision. From these results all conceivable spin-correlations are determined with inherent self-consistency. Good agreement is found with the few previously existing measurements of spin observables in anti-proton + proton -> anti-\Lambda + \Lambda near this energy. Existing theoretical models do not give good predictions for those spin-observables that had not been previously measured.
Geochemical and isotopic imprints of hydrodynamic environments of fissure waters in crystalline rocks
Yanxin Wang,Alexander P. Khaustov
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03186971
Abstract: The movement of fissure water is variable both in time and in space. The distribution of sinters and the change of their compositions record the evolution of fissure water flow. The variability of fissure water flow in space, on the other hand, often causes remarkable difference in the chemical and isotopic compositions of fissure waters from the same area. On the premise of the verification of hydraulic continuity, system analysis and numerical modelling of fissure waters can be made on different scales.
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