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Search Results: 1 - 10 of 461337 matches for " A. Reshetin "
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Features of the gas discharge in the narrow gap micro-pattern gas detectors (MPGD) at a high level of alpha-particles background
V. I. Razin,A. I. Reshetin
Physics , 2010,
Abstract: In given article preliminary results of the research of the electron multiplication in MPGD are presented at a high level of alpha-particles background. This work has expanded borders of understanding of the streamer mode nature. It is seen as a complex from electrostatic and electromagnetic interactions which begin with appearance of the precursor in plasma state. In an inter-electrode gap the plasma oscillations occur, accompanied by longitudinal elastic waves of ionization, which can reach the cathode surface with induced negative charge. With the release of this charge due to previously established conducting channel there is a strong current pulse, accompanied by the emission due to recombination of positive and negative ions and a thin cord or streamer derive. In the aim of the MPGD protection from the spark breakdown at a high level of the alpha-particle background the next gas composition from a buffer, cooling and electronegative components are offered: 70% He +28% CF4 +2% SF6.
Wire GEM detector
B. M. Ovchinnikov,V. I. Razin,A. I. Reshetin,S. N. Filippov
Physics , 2009,
Abstract: A wire GEM (WGEM) detector with a gas gap between meshes was constructed. The detector provides the amplification 5x10E5 for the gas mixture of Ar +20% CO2 at atmospheric pressure. As compared with well-known GEM detectors produced by perforation the plastic plate metalized on both sides the WGEM does not suffer from breakdowns between its electrodes and the effect of accumulation of charges on holes walls is absent. As a result the WGEM has high reliability and stability.
RETGEM with polyvinylchloride (PVC) electrodes
V. I. Razin,B. M. Ovchinnikov,A. I. Reshetin,S. N. Filippov
Physics , 2009,
Abstract: This paper presents a new design of the RETGEM (Resistive Electrode Thick GEM) based on electrodes made of a polyvinylchloride material (PVC). Our device can operate with gains of 10E5 as a conventional TGEM at low counting rates and as RPC in the case of high counting rates without of the transit to the violent sparks. The distinct feature of present RETGEM is the absent of the metal coating and lithographic technology for manufacturing of the protective dielectric rms. The electrodes from PVC permit to do the holes by a simple drilling machine. Detectors on a RETGEM basis could be useful in many fields of an application requiring a more cheap manufacturing and safe operation, for example, in a large neutrino experiments, in TPC, RICH systems.
Electromagnetic Calorimeter for HADES
W. Czyzycki,E. Epple,L. Fabbietti,M. Golubeva,F. Guber,A. Ivashkin,M. Kajetanowicz,A. Krasa,F. Krizek,A. Kugler,K. Lapidus,E. Lisowski,J. Pietraszko,A. Reshetin,P. Salabura,Y. Sobolev,J. Stanislav,P. Tlusty,T. Torrieri,M. Traxler
Physics , 2011,
Abstract: We propose to build the Electromagnetic calorimeter for the HADES di-lepton spectrometer. It will enable to measure the data on neutral meson production from nucleus-nucleus collisions, which are essential for interpretation of dilepton data, but are unknown in the energy range of planned experiments (2-10 GeV per nucleon). The calorimeter will improve the electron-hadron separation, and will be used for detection of photons from strange resonances in elementary and HI reactions. Detailed description of the detector layout, the support structure, the electronic readout and its performance studied via Monte Carlo simulations and series of dedicated test experiments is presented. The device will cover the total area of about 8 m^2 at polar angles between 12 and 45 degrees with almost full azimuthal coverage. The photon and electron energy resolution achieved in test experiments amounts to 5-6%/sqrt(E[GeV]) which is sufficient for the eta meson reconstruction with S/B ratio of 0.4% in Ni+Ni collisions at 8 AGeV. A purity of the identified leptons after the hadron rejection, resulting from simulations based on the test measurements, is better than 80% at momenta above 500 MeV/c, where time-of-flight cannot be used.
pi+ + d --> p + p reaction between 18 and 44 MeV
E. A. Pasyuk,V. Yu. Alexakhin,S. I. Gogolev,K. O. Oganesyan,C. L. Morris,J. M. O'Donnell,M. W. Rawool-Sullivan,M. K. Jones,F. F. Guber,A. I. Reshetin,I. I. Strakovsky
Physics , 1996, DOI: 10.1103/PhysRevC.55.1026
Abstract: A study of the reaction pi+ + d --> p + p has been performed in the energy range of 18 - 44 MeV. Total cross sections and differential cross sections at six angles have been measured at 15 energies with an energy increment of 1 - 2 MeV. This is the most systematic data set in this energy range. No structure in the energy dependence of the cross section has been observed within the accuracy of this experiment.
Emission of forward neutrons by 158A GeV indium nuclei in collisions with Al, Cu, Sn and Pb
E. V. Karpechev,I. A. Pshenichnov,T. L. Karavicheva,A. B. Kurepin,M. B. Golubeva,F. F. Guber,A. I. Maevskaia,A. I. Reshetin,V. V. Tiflov,N. S. Topilskaya,P. Cortese,G. Dellacasa,R. Arnaldi,N. DeMarco,A. Ferretti,M. Gallio,A. Musso,C. Oppedisano,A. Piccotti,E. Scomparin,E. Vercellin,C. Cicalo,G. Puddu,E. Siddi,P. Szymanski,I. Efthymiopoulos
Physics , 2013, DOI: 10.1016/j.nuclphysa.2013.11.003
Abstract: The cross sections of forward emission of one, two and three neutrons by 158A GeV 115In nuclei in collisions with Al, Cu, Sn and Pb targets are reported. The measurements were performed in the framework of the ALICE-LUMI experiment at the SPS facility at CERN. Various corrections accounting for the absorption of beam nuclei and produced neutrons in target material and surrounding air were introduced. The corrected cross section data are compared with the predictions of the RELDIS model for electromagnetic fragmentation of 115In in ultraperipheral collisions, as well as with the results of the abrasion-ablation model for neutron emission in hadronic interactions. The measured neutron emission cross sections well agree with the RELDIS results, with the exception of In-Al collisions where the measured cross sections are larger compared to RELDIS. This is attributed to a relatively large contribution of hadronic fragmentation of In on Al target with respect to electromagnetic fragmentation, on the contrary to similar measurements performed earlier with 30A GeV 208Pb colliding with Al.
Study of dielectron production in C+C collisions at 1 AGeV
HADES Collaboration,G. Agakishiev,C. Agodi,H. Alvarez Pol,A. Balanda,R. Bassini,G. Bellia,D. Belver,A. Belyaev,A. Blanco,M. Boehmer,A. Bortolotti,J. L. Boyard,P. Braun-Munzinger,P. Cabanelas,E. Castro,T. Christ,M. Destefanis,J. Diaz,F. Dohrmann,A. Dybczak,T. Eberl,L. Fabbietti,P. Finocchiaro,P. Fonte,J. Friese,I. Froehlich,T. Galatyuk,J. A. Garzon,R. Gernhaeuser,A. Gil,C. Gilardi,M. Golubeva,D. Gonzalez Diaz,E. Grosse,F. Guber,M. Heilmann,T. Hennino,R. Holzmann,A. Ierusalimov,I. Iori,A. Ivashkin,M. Jurkovic,B. Kaempfer,K. Kanaki,T. Karavicheva,D. Kirschner,I. Koenig,W. Koenig,B. W. Kolb,R. Kotte,A. Kozuch,A. Krasa,F. Krizek,R. Kruecken,W. Kuehn,A. Kugler,A. Kurepin,J. Lamas Valverde,S. Lang,J. S. Lange,K. Lapidus,L. Lopes,L. Maier,A. Mangiarotti,J. Marin,J. Markert,V. Metag,B. Michalska,D. Mishra,E. Moriniere,J. Mousa,M. Muench,C. Muentz,L. Naumann,R. Novotny,J. Otwinowski,Y. C. Pachmayer,M. Palka,Y. Parpottas,V. Pechenov,O. Pechenova,T. Perez,J. Pietraszko,R. Pleskac,W. Przygoda,B. Ramstein,A. Reshetin,M. Roy Stephan,A. Rustamov,A. Sadovsky,B. Sailer,P. Salabura,A. Schmah,R. Simon,Y. Sobolev,S. Spataro,B. Spruck,H. Stroebele,J. Stroth,C. Sturm,M. Sudol,A. Tarantola,K. Teilab,P. Tlusty,A. Toia,M. Traxler,R. Trebacz,H. Tsertos,I. Veretenkin,V. Wagner,M. Weber,H. Wen,M. Wisniowski,T. Wojcik,J. Wuestenfeld,S. Yurevich,Y. Zanevsky,P. Zhou,P. Zumbruch
Physics , 2007, DOI: 10.1016/j.physletb.2008.03.062
Abstract: The emission of e+e- pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the pi0-Dalitz to the rho/omega! invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment.
Cross section in deuteron-proton elastic scattering at 1.25 GeV/u
HADES Collaboration,P. K. Kurilkin,G. Agakishiev,A. Balanda,D. Belver,A. Belyaev,A. Blanco,M. B?hmer,J. L. Boyard,P. Cabanelas,E. Castro,S. Chernenko,J. Díaz,A. Dybczak,E. Epple,L. Fabbietti,O. Fateev,P. Finocchiaro,P. Fonte,J. Friese,I. Fr?hlich,T. Galatyuk,J. A. Garzón,A. Gil,M. Golubeva,D. González-Díaz,F. Guber,T. Hennino,R. Holzmann,P. Huck,A. Ierusalimov,I. Iori,A. Ivashkin,M. Jurkovic,B. K?mpfer,T. Karavicheva,I. Koenig,W. Koenig,B. W. Kolb,A. Kopp,G. Korcyl,G. K. Kornakov,R. Kotte,A. Kozuch,A. Krása,F. Krizek,R. Krücken,H. Kuc,W. Kühn,A. Kugler,A. Kurepin,A. Kurilkin,P. Khlitz,V. Ladygin,J. Lamas-Valverde,S. Lang,K. Lapidus,T. Liu,L. Lopes,M. Lorenz,L. Maier,A. Mangiarotti,J. Markert,V. Metag,B. Michalska,J. Michel,C. Müntz,L. Naumann,Y. C. Pachmayer,M. Palka,Y. Parpottas,V. Pechenov,O. Pechenova,J. Pietraszko,W. Przygoda,B. Ramstein,A. Reshetin,J. Roskoss,A. Rustamov,A. Sadovsky,P. Salabura,A. Schmah,J. Siebenson,Yu. G. Sobolev,S. Spataro,H. Str?bele,J. Stroth,C. Sturm,M. Sudol,A. Tarantola,K. Teilab,P. Tlusty,M. Traxler,R. Trebacz,H. Tsertos,T. Vasiliev,V. Wagner,M. Weber,J. Wüstenfeld,S. Yurevich,Y. Zanevsky
Physics , 2011,
Abstract: First results of the differential cross section in dp elastic scattering at 1.25 GeV/u measured with the HADES over a large angular range are reported. The obtained data corresponds to large transverse momenta, where a high sensitivity to the two-nucleon and three-nucleon short-range correlations is expected.
Single and double pion production in np collisions at 1.25 GeV with HADES
The HADES Collaboration,A. K. Kurilkin,G. Agakishiev,A. Balanda,D. Belver,A. Belyaev,A. Blanco,M. B?hmer,J. L. Boyard,P. Cabanelas,E. Castro,S. Chernenko,J. D\'\iaz,A. Dybczak,E. Epple,L. Fabbietti,O. Fateev,P. Finocchiaro,P. Fonte,J. Friese,I. Fr?hlich,T. Galatyuk,J. A. Garzón,A. Gil,M. Golubeva,D. González-D\'\iaz,F. Guber,T. Hennino,R. Holzmann,P. Huck,A. Ierusalimov,I. Iori,A. Ivashkin,M. Jurkovic,B. K?mpfer,T. Karavicheva,I. Koenig,W. Koenig,B. W. Kolb,A. Kopp,G. Korcyl,GK. Kornakov,R. Kotte,A. Kozuch,A. Krása,F. Krizek,R. Krücken,H. Kuc,W. Kühn,A. Kugler,A. Kurepin,P. Kurilkin,P. Khlitz,V. Ladygin,J. Lamas-Valverde,S. Lang,K. Lapidus,T. Liu,L. Lopes,M. Lorenz,L. Maier,A. Mangiarotti,J. Markert,V. Metag,B. Michalska,J. Michel,C. Müntz,L. Naumann,Y. C. Pachmayer,M. Palka,Y. Parpottas,V. Pechenov,O. Pechenova,J. Pietraszko,W. Przygoda,B. Ramstein,A. Reshetin,J. Roskoss,A. Rustamov,A. Sadovsky,P. Salabura,A. Schmah,J. Siebenson,Yu. G. Sobolev,S. Spataro,H. Str?bele,J. Stroth,C. Sturm,M. Sudol,A. Tarantola,K. Teilab,P. Tlusty,M. Traxler,R. Trebacz,H. Tsertos,T. Vasiliev,V. Wagner,M. Weber,J. Wüstenfeld,S. Yurevich,Y. Zanevsky
Physics , 2011,
Abstract: The preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV measured with HADES are presented. The np reactions were isolated in dp collisions at 1.25 GeV/u using the Forward Wall hodoscope, which allowed to register spectator protons. The results for np -> pppi-, np -> nppi+pi- and np -> dpi+pi- channels are compared with OPE calculations. A reasonable agreement between experimental results and the predictions of the OPE+OBE model is observed.
Future perspectives at SIS-100 with HADES-at-FAIR
The HADES Collaboration,I. Froehlich,G. Agakishiev,A. Balanda,G. Bellia,D. Belver,A. Belyaev,A. Blanco,M. Boehmer,J. L. Boyard,P. Braun-Munzinger,P. Cabanelas,E. Castro,S. Chernenko,T. Christ,M. Destefanis,J. Diaz,F. Dohrmann,A. Dybczak,L. Fabbietti,O. Fateev,P. Finocchiaro,P. Fonte,J. Friese,T. Galatyuk,J. A. Garzon,R. Gernhaeuser,A. Gil,C. Gilardi,M. Golubeva,D. Gonzalez-Diaz,E. Grosse,F. Guber,M. Heilmann,T. Hennino,R. Holzmann,A. Ierusalimov,I. Iori,A. Ivashkin,M. Jurkovic,B. Kaempfer,K. Kanaki,T. Karavicheva,D. Kirschner,I. Koenig,W. Koenig,B. W. Kolb,R. Kotte,A. Kozuch,A. Krasa,F. Krizek,R. Kruecken,W. Kuehn,A. Kugler,A. Kurepin,J. Lamas-Valverde,S. Lang,J. S. Lange,K. Lapidus,T. Liu,L. Lopes,M. Lorenz,L. Maier,A. Mangiarotti,J. Marin,J. Markert,V. Metag,B. Michalska,J. Michel,D. Mishra,E. Moriniere,J. Mousa,C. Muentz,L. Naumann,R. Novotny,J. Otwinowski,Y. C. Pachmayer,M. Palka,Y. Parpottas,V. Pechenov,O. Pechenova,T. Perez Cavalcanti,J. Pietraszko,W. Przygoda,B. Ramstein,A. Reshetin,A. Rustamov,A. Sadovsky,P. Salabura,A. Schmah,R. Simon,Yu. G. Sobolev,S. Spataro,B. Spruck,H. Stroebele,J. Stroth,C. Sturm,M. Sudol,A. Tarantola,K. Teilab,P. Tlusty,M. Traxler,R. Trebacz,H. Tsertos,I. Veretenkin,V. Wagner,M. Weber,M. Wisniowski,J. Wuestenfeld,S. Yurevich,Y. Zanevsky,P. Zhou,P. Zumbruch
Physics , 2009,
Abstract: Currently, the HADES spectrometer undergoes un upgrade program to be prepared for measurements at the upcoming SIS-100 synchrotron at FAIR. We describe the current status of the HADES di-electron measurements at the SIS-18 and our future plans for SIS-100.
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