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5 results on '"Avdeichikov, V"'

1. Investigation of reactions using polarized and unpolarized deuteron beam at Nuclotron: current status and perspectives.

Author

Janek, M., Ladygin, V. P., Avdeichikov, V. V., Averyanov, A. V., Belov, A. S., Fimushkin, V. V., Gurchin, Yu. V., Isupov, A. Yu., Karachuk, J-T., Khrenov, A. N., Krivenkov, D. O., Kurilkin, A. K., Kurilkin, P. K., Ladygina, N. B., Livanov, A. N., Martinska, G., Piyadin, S. M., Reznikov, S. G., Tarjanyiova, G., and Terekhin, A. A.

Subjects
POLARIZED deuterons, ELASTIC scattering, NUCLEAR reactions, NUCLEAR cross sections, NUCLEAR counters
Abstract

Deuteron induced reactions at intermediate energies are investigated at Internal Target Station (ITS) of Nuclotron. The dp elastic scattering data have been accumulated in the angular range (70° - 120°) in c.m from 0.3 to 2.0 GeV of deuteron energy. Part of the obtained results of differential cross sections and analyzing powers of dp elastic scattering are compared with theoretical predictions based on relativistic multi-scattering model. The dp breakup data are obtained with the detection of two outgoing protons at the angles of (19° - 54°) in laboratory frame at the deuteron energies from 0.3 to 0.5 GeV in various detector configurations. One of the tools to study spin structure of short range correlations is the measurements of the cross section, tensor analyzing power T20 and spin correlation parameter Cy,y in the d3He → p(0°)4 He reaction at the energies between 1.0 and 1.75 GeV using polarized 3He target and extracted polarized deuteron beam from new polarized ion source at Nuclotron. For this purposes the feasibility study has been performed. Proposed experiments on extracted deuteron beam of Nuclotron is aimed to investigate: non-nucleonic degrees of freedom and baryonic resonances properties in the d(A,d(0°))X and d(A,π-(0°))X reactions at different energies, non-nucleonic degrees of freedom via the measurements of the tensor Ayy and vector Ay analyzing powers in d(A,π-)X reaction and polarization properties of the baryonic resonances in the d(A,d)X reaction and others. First measurement of vector and tensor polarization of new polarized ion source has been performed in June-July of 2016y. [ABSTRACT FROM AUTHOR]

Published
2017
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2. Neutral pion number fluctuations at high multiplicity in pp-interactions at 50 GeV.

Author

Afonin, A. G., Aleev, A. N., Ardashev, E. N., Avdeichikov, V. V., Balandin, V. P., Basiladze, S. G., Batouritski, M. A., Berezhnev, S. F., Bogdanova, G. A., Borzunov, Yu. T., Budilov, V. A., Chentsov, Yu. A., Ermakov, G. G., Ermolov, P. F., Furmanets, N. F., Golovkin, V. F., Golovnya, S. N., Gorokhov, S. A., Grishin, N. I., and Grishkevich, Ya. V.

Subjects
PROTON beams, IRRADIATION, PHOTONS, ELECTROMAGNETISM, PIONS, MULTIPLICITY of nuclear particles
Abstract

The results of E-190 experiment (project Thermalization) with 50 GeV proton beam irradiation of SVD-2 setup are presented. MC simulation has shown the linear dependence of number of photons detected in electromagnetic calorimeter and the average number of neutral pions. Multiplicity distribution of neutral pion, N0, for total number of particles in the event, Ntot = Nch + N0, are obtained with corrections on the setup acceptance, triggering and efficiency of the event reconstruction. The scaled variance of neutral pion fluctuations, ω = D/ < N0 >, versus total multiplicity is measured. The fluctuations increase at Ntot > 18. According to quantum statistics models this behavior can indicate a pion condensate formation in the high pion multiplicity system. This effect has been observed for the first time. [ABSTRACT FROM AUTHOR]

Published
2012
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3. Spectrometer with a vertex detector for experiments at the IHEP accelerator.

Author

Avdeichikov, V., Aleev, A., Ardashev, E., Basiladze, S., Bogdanova, G., Vishnevskaya, A., Volkov, V., Vorob'ev, A., Voronin, A., Golovnya, S., Golovkin, V., Gorokhov, S., Grishkevich, Ya., Ermolov, P., Zverev, E., Zotkin, S., Karmanov, D., Kireev, V., Kokoulina, E., and Kramarenko, V.

Subjects
SPECTROMETERS, VERTEX detectors, CHEMISTRY experiments, MAGNETIC spectrometer, BAND gaps
Abstract

The stages of development and the current status of the versatile 'Spectrometer with a Vertex Detector' setup designed for physics experiments at the U-70 accelerator of the Institute for High Energy Physics (Protvino) is described. The main detectors of the setup are the vertex detector based on silicon microstrip detectors, the wide-aperture magnetic spectrometer based on multiwire proportional chambers, and the lead-glass hodoscope γ detector. In the setup, there is a fast two-level trigger system for selecting required particle interactions. The key characteristics of the setup systems are presented, and the physical results obtained on it are briefly listed. [ABSTRACT FROM AUTHOR]

Published
2013
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4. A trigger of events with a high multiplicity of charged particles at the SVD-2 setup.

Author

Avdeichikov, V., Bogdanova, G., Budilov, V., Volkov, V., Kokoulina, E., Kutov, A., Leflat, A., Nikitin, V., Popov, V., Rufanov, I., and Kholodenko, A.

Subjects
MULTIPLICITY of nuclear particles, PHYSICS projects, PROTON beams, PARTICLE accelerators, PHYSICS experiments, NUCLEAR energy, CENTER of mass, ENERGY dissipation, MAGNETIC spectrometer
Abstract

The Thermalization project is currently under way on the extracted proton beam of the U-70 accelerator at the Institute for High Energy Physics. The main goal of this experiment is to study the collective behavior of secondary particles produced in a multiparticle pp interaction at beam energy E = 50-70 GeV. The region of high charged-particle multiplicities n ≥ 10 is investigated. In this region, a significant portion of energy in the center-of-mass system is dissipated on production of secondary particles, which results in formation of a hadronic system. At the initial instant of evolution, the density of this system is high, which may be responsible for the collective behavior of the secondary particles. The investigations are performed at the SVD-2 wide-aperture magnetic spectrometer. A multichannel trigger scintillation hodoscope used to select rare events with a large number of charged particles exceeding the predetermined value is described. The main flow of low-multiplicity events is suppressed by the trigger system by a factor of ∼10. [ABSTRACT FROM AUTHOR]

Published
2011
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