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90 results on '"Khomyakov, V. A."'

3. Production and electromagnetic decay of hyperons: a feasibility study with HADES as a phase-0 experiment at FAIR

Author

Adamczewski-Musch, J., Belyaev, A., Blanco, A., Blume, C., Charlotte, C., Borisenko, D. S., Charlotte, C., Chlad, L., Chudoba, P., Ciepał, I., Derichs, A., Dittert, D., Dreyer, J., Esmail, W., Fateev, O., Fonte, P., Friese, J., Fröhlich, I., Förtsch, J., Galatyuk, T., Georgadze, I., Golosov, O., Golubeva, M., Greifenhagen, R., Grunwald, M., Grzonka, D., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Heybeck, B., Höhne, C., Holona, M., Holzmann, R., Huck, H., Ierusalimov, A., Imre, M., Ivashkin, A., Kämpfer, B., Kampert, K-H., Kardan, B., Kedych, V., Khomyakov, V., Koenig, I., Koenig, W., Kohls, M., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kozlov, V., Kres, I., Kuboś, J., Kugler, A., Kulessa, P., Ladygin, V., Lalik, R., Le Galliard, C., Lebedev, A., Lebedev, S., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Malige, A., Markert, J., Matulewicz, T., Michel, J., Morozov, S., Müntz, C., Naumann, L., Nowakowski, K., Orfanitsky, S., Otto, J. -H., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Perez Andrade, G., Petukhov, O., Pfeifer, D., Piasecki, K., Pietraszko, J., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Regina, J., Reshetin, A., Reznikov, S., Rieger, J. T., Ritman, J., Rodriguez-Ramos, P., Rost, A., Rustamov, A., Salabura, P., Saraiva, J., Schild, N., Schwab, E., Schönning, K., Scozzi, F., Seck, F., Selyuzhenkov, I., Serdyuk, V., Shabanov, A., Singh, U., Smyrski, J., Sobiella, M., Spies, S., Strikhanov, M., Ströbele, H., Stroth, J., Sumara, K., Svoboda, O., Szala, M., Szewczyk, J., Taranenko, A., Tlusty, P., Traxler, M., Wagner, V., Wasiluk, M., Weber, A. A., Wendisch, C., Wintz, P., Włoch, B., Zbroszczyk, H. P., Zherebzova, E., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Published
2021
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15. Automated Assessment of the Area of Infiltration by CD8+ Cells in Gastric Carcinoma and Areas of Normal Mucosa as a Significant Prognostic Factor.

Author

Danilova, N. V., Mikhailov, I. A., Khomyakov, V. M., Chaika, A. V., Polushkina, T. V., Sotnikova, T. N., Oleinikova, N. A., and Mal'kov, P. G.

Subjects
PROGNOSIS, STOMACH cancer, MUCOUS membranes, GASTRIC mucosa, CONFIDENCE intervals, T cells
Abstract

In 139 patients with verified gastric cancer, the infiltration of the postoperative material with CD8+ cells was analyzed. Automated morphometric analysis of immunostained slides was performed separately in different specimen sites (tumor center, invasive edge, and peritumoral mucosa). The mean area of infiltrating CD8+ cells in the tumor center and in the invasive edge was not predictive, while in the peritumoral mucosa it provided a new negative predictive factor (hazard ratio 2.10; confidence interval 0.87-4.92, Cox regression) reliably associated with the TNM stage (hazard ratio 1.91; confidence interval 0.91-4.61, Cox regression). [ABSTRACT FROM AUTHOR]

Published
2023
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17. Time-Like Baryon Transitions studies with HADES

Author

Ramstein B., Adamczewski-Musch J., Arnold O., Arnoldi-Meadows B., Belounnas A., Belyaev A., Biernat J., Blanco A., Blume C., Böhmer M., Bordalo P., Chlad L., Chudoba P., Ciepał I., Deveaux C., Dittert D., Dreyer J., Fabbietti L., Fateev O., Fonte P., Franco C., Friese J., Fröhlich I., Galatyuk T., Garzón J. A., Gernhäuser R., Gillitzer A., Golubeva M., Greifenhagen R., Guber F., Gumberidze M., Harabasz S., Heinz T., Hennino T., Himmelreich M., Höhne C., Holzmann R., Ierusalimov A., Ivanov V., Ivashkin A., Kämpfer B., Kajetanowicz M., Kampert K-H., Karavicheva T., Kardan B., Khomyakov V., Koenig I., Koenig W., Korcyl G., Kornakov G., Kornas F., Kotte R., Kozela A., Kuboś J., Kugler A., Kunz T., Kurepin A., Kurilkin P., Kushpil V, Ladygin V., Lalik R., Lebedev A., Linev S., Liu M., Lopes L., Lorenz M., Lykasov G., Mahmoud T., Malakhov A., Markert J., Maurus S., Metag V., Michel J., Mihaylov D.M., Mikhaylov V., Morozov S., Müntz C., Naumann L., Nowakowski K., Parpottas Y., Patel V., Pauly C., Pechenov V., Pechenova O., Pereira A., Petousis V., Petukhov O., Pfeifer D., Pietraszko J., Przygoda W., Pysz K., Ramos S., Reshetin A., Ritman L., Rodriguez-Ramos P., Rost A., Sadovsky A., Salabura P., Scheib T., Schuldes H., Schwab E., Scozzi F., Seck F., Sellheim P., Selyuzhenkov I., Silva L., Smyrski J., Sobiella M., Spataro S., Spies S., Ströbele H., Stroth J., Strzempek P., Svoboda O., Szala M., Taranenko A., Tlusty P., Traxler M., Troyan A., Tsertos H., Wagner V., Wendisch C., Wiebusch M.G., Wintz P., Wirth J., Włoch B., Zhilin A., Zinchenko A., Zumbruch P., and Zuschke M.

Subjects
Physics, QC1-999
Abstract

The HADES collaboration uses the e+e− production as a probe of the resonance matter produced in collisions at incident energies of 1-3.5 GeV/nucleon at GSI. Elementary reactions provide useful references for these studies and give information on resonance Dalitz decays (R→Ne+e−). Such processes are sensitive to the structure of time-like electromagnetic baryon transitions in a kinematic range where (off-shell) vector mesons play a crucial role. Results obtained in proton-proton reactions and in a commissioning pion-beam experiment are reported and prospects for future pion beam experiments and for first hyperon Dalitz decay measurements are described. The connection with the investigations of medium effects to be continued with HADES in the next years at SIS18 and SIS100 is also discussed.

Published
2019
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18. Study of cascade showers generated by near-horizontal muons in the water Cherenkov detector with a dense array of optical modules

Author

Khokhlov, S. S., Amel’chakov, M. B., Barbashina, N. S., Bogdanov, A. G., Burtsev, V. D., Dmitrieva, A. N., Dushkin, L. I., Zadeba, E. A., Kindin, V. V., Kovylyaeva, E. A., Kokoulin, R. P., Kompaniets, K. G., Kruglikova, V. S., Ovchinnikov, V. V., Petrukhin, A. A., Khomyakov, V. A., Chernov, D. V., Shul’zhenko, I. A., Shutenko, V. V., and Yashin, I. I.

Published
2014
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20. Cascade showers in the NEVOD Cherenkov water detector

Author

Khokhlov, S. S., Barbashina, N. S., Bogdanov, A. G., Dmitrieva, A. N., Dushkin, L. I., Zadeba, E. A., Kindin, V. V., Kovylyaeva, E. A., Kokoulin, R. P., Kompaniets, K. G., Kruglikova, V. S., Petrukhin, A. A., Khomyakov, V. A., Chernov, D. V., Shutenko, V. V., and Yashin, I. I.

Published
2014
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33. Multi-differential pattern of low-mass e(+)e(-) excess from root S-NN=2.4 GeV Au+Au collisions with HADES

Author

Harabasz, S., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

The matter formed in central heavy-ion collisions at a few GeV per nucleon is commonly understood as resonance matter, a gas of nucleons and excited baryon states with a substantial contribution from mesonic, mostly pionic excitations. Yet, in the initial phase of the reaction the system is compressed to beyond nuclear ground state density and hence substantial modifications of the hadron properties are expected to occur. The spectral distribution of virtual photons measured in Au+Au collisions at 2.4 GeV center of mass energy indicates strong medium effects beyond pure superposition of individual NN collisions. We present multi-differential distributions of low-mass electron pairs. This radiation is remarkably well described assuming emission from a thermalized system. To gain deeper understanding of the microscopic origin of the radiation, we extracted the centrality dependent true (not blue-shifted) temperature, its azimuthal distribution, as well as mass-dependent effective slope parameter. Virtual photon spectra are confronted with available model calculations.

Published
2019

34. Sub-threshold strangeness production measured with HADES

Author

Kornakov, G., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

At energies below sqrt(sNN) approximate to 2.55 GeV, strange quarks cannot be produced in binary nucleon-nucleon collisions because of the higher production threshold of the lightest hadrons carrying strangeness. Hence, the investigation of sub-threshold strangeness production in heavy-ion collisions is one of the most promising probes, to access the properties of the created system, as the missing energy must be provided by the latter one. For the first time, a nearly complete set of strange particles has been reconstructed in the 40% most central Au+Au collisions at sqrt(sNN) = 2.42 GeV. The data sample includes multi-differential representations of charged and neutral particles containing strangeness (K+,-,Ks0, φ, Λ). To achieve a better understanding of strangeness production the properties of the short-lived resonances have to be investigated. The first steps in this direction are presented here, including the reconstruction of baryon resonances using a new iterative technique, comparison to microscopic transport model calculations and interpretation of the pion transverse momentum distribution.

Published
2019

35. Collective flow and correlations measurements with HADES in Au plus Au collisions at 1.23 AGeV

Author

Kardan, B., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

The HADES experiment provides a large acceptance combined with a high mass resolution and therefore makes it possible to study dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the high statistics of seven billion Au+Au collisions at 1.23 AGeV recorded in 2012 the investigation of collective effects and particle correlations is possible with unprecedented accuracy. We present multi-differential data on directed (v(1)) and elliptic (v(2)) flow, and the first measurement of triangular flow (v(3)), of protons and deuterons.

Published
2019

36. Energy spectrum of cascade showers generated by cosmic ray muons in water

Author

Kokoulin, R. P., Barbashina, N. S., Bogdanov, A. G., Burtsev, V. D., Chernov, D. V., Khokhlov, S. S., Khomyakov, V. A., Kindin, V. V., Kompaniets, K. G., Petrukhin, A. A., Shutenko, V. V., and Yashin, I. I.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det), Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

The spatial distribution of Cherenkov radiation from cascade showers generated by muons in water has been measured with Cherenkov water calorimeter (CWC) NEVOD. This result allowed to improve the techniques of treating cascade showers with unknown axes by means of CWC response analysis. The techniques of selecting the events with high energy cascade showers and reconstructing their parameters are discussed. Preliminary results of measurements of the spectrum of cascade showers in the energy range 100 GeV - 20 TeV generated by cosmic ray muons at large zenith angles and their comparison with expectation are presented., XXV ECRS 2016 Proceedings - eConf C16-09-04.3

Published
2017

38. Test of prototype CBM detector components with proton beams at COSY

Author

Heuser, J., Adak, R., Balog, T., Chattopadhyay, S., Dementyev, D., Dubey, A., Emschermann, D., Eschke, J., Friese, J., Ghosh, P., Heinz, T., Khomyakov, V., Koczon, P., Larionov, P., Lehnert, J., Momot, I., Müller, W. F. J., Niebur, W., Oancea, A., Uhlig, F., Saini, J., Samanta, S., Singla, M., Sorokin, I., Sturm, C., Stüllein, C., Varga, D., Wolf, A., and Zumbruch, P.

Subjects
Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015
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39. Measurements of the energy deposit of multi-muon events in the Cherenkov water calorimeter.

Author

Kokoulin, R. P., Barbashina, N. S., Bogdanov, A. G., Chernov, D. V., Dushkin, L. I., Khokhlov, S. S., Khomyakov, V. A., Kindin, V. V., Kompaniets, K. G., Mannocchi, G., Petrukhin, A. A., Saavedra, O., Shutenko, V. V., Trinchero, G., Yashin, I. I., and Yurina, E. A.

Subjects
MUON spectra, CHERENKOV counters, SIMULATION methods & models, HADRONIC showers, DETECTORS
Abstract

To solve the problem of the excess of multi-muon events observed in several cosmic ray experiments at ultra-high energies (so-called "muon puzzle"), an analysis of the energy characteristics of the muon component of extensive air showers (EAS) is required. A possible approach to such investigations is the measurement of the energy deposit of muon bundles in the detector, which provides information on the mean muon energy. In the experiment now being conducted at the NEVOD-DECOR complex, the local muon density and EAS arrival direction are determined according to the data of the coordinate-tracking detector DECOR, whereas the energy deposit is measured by means of the Cherenkov water calorimeter NEVOD. Results of the measurements of the energy deposit of inclined muon bundles based on the data accumulated during more than 23,200 h observations in 2012 - 2016 are presented and compared with simulations performed by means of the CORSIKA code. [ABSTRACT FROM AUTHOR]

Published
2017
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40. Observation of high-energy cosmic rays by very inclined muon bundles in the NEVOD-DECOR experiment.

Author

Saavedra, O., Barbashina, N. S., Bogdanov, A. G., Chernov, D. V., Dushkin, L. I., Khokhlov, S. S., Khomyakov, V. A., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Mannocchi, G., Petrukhin, A. A., Shutenko, V. V., Trinchero, G., Yashin, I. I., Yurin, K. O., and Zadeba, E. A.

Subjects
COSMIC rays, HIGH energy electron diffraction, PARTICLE physics, MUON spectra, ZENITH distance
Abstract

The Russian-Italian NEVOD-DECOR experiment on measurements of the local muon density spectra at various zenith angles gave the possibility to obtain important information on the primary cosmic ray flux and interaction characteristics in a wide energy range from 1015 to more than 1018M eV. At large zenith angles and high muon densities, a considerable excess of muon bundles has been found in comparison with expectation. In this paper, an update of these investigations is presented and some new results obtained by the collaboration are discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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49. NEVOD-DECOR experiment: results and future.

Author

Saavedra, O, Amelchakov, M B, Barbashina, N S, Bogdanov, A G, Chernov, D V, Chiavassa, A, Dushkin, L I, Khokhlov, S S, Khomyakov, V A, Kindin, V V, Kokoulin, R P, Kompaniets, K G, Mannocchi, G, Matveev, S Yu, Petrukhin, A A, Shestakov, V V, Shulzhenko, I A, Shutenko, V V, Trinchero, G, and Yashin, I I

Published
2013
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