O. Borodina

Publications (6)0 Total impact

• Source

  Available from: ArXiv

  Article: Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2

  P. Achenbach, C. Ayerbe Gayoso, J. C. Bernauer, S. Bianchin, R Böhm, O. Borodina, M. Bösz, D. Bosnar, V. Bozkurt, P. Bydžovský, [......], B. Özel-Tashenov, J. Pochodzalla, M. Potokar, Ch. Rappold, T. R. Saito, S. Sánchez Majos, B. S. Schlimme, S. Širca, M. Weinriefer, C. J. Yoon
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  ABSTRACT: Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third resonance region with virtual photons of low four-momenta, Q^2= 0.030-0.055 (GeV/c)^2. The MAMI data indicate a smooth transition in Q^2 from photoproduction to electroproduction cross sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models.
  04/2011;
• Source

  Available from: Myroslav Kavatsyuk

  Article: The HypHI project: Hypernuclear spectroscopy with stable heavy ion beams and rare isotope beams at GSI and FAIR

  S. Bianchin, P. Achenbach, S. Ajimura, O. Borodina, T Fukuda, J Hoffmann, M. Kavatsyuk, K. Koch, T Koike, N. Kurz, [......], C. Rappold, T. R. Saito, A Sakaguchi, M Sako, M Sekimoto, H Sugimura, T Takahashi, H Tamura, K Tanida, W. Trautmann
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  ABSTRACT: The HypHI collaboration aims to perform a precise hypernuclear spectroscopy with stable heavy ion beams and rare isotope beams at GSI and fAIR in order to study hypernuclei at extreme isospin, especially neutron rich hypernuclei to look insight hyperon-nucleon interactions in the neutron rich medium, and hypernuclear magnetic moments to investigate baryon properties in the nuclei. We are currently preparing for the first experiment with $^6$Li and $^{12}$C beams at 2 AGeV to demonstrate the feasibility of a precise hypernuclear spectroscopy by identifying $^{3}_{\Lambda}$H, $^{4}_{\Lambda}$H and $^{5}_{\Lambda}$He. The first physics experiment on these hypernuclei is planned for 2009. In the present document, an overview of the HypHI project and the details of this first experiment will be discussed. Comment: 5 pages, 2 figures, French-Japanese symposium 2008, Paris (France)
  12/2008;
• Article: The HypHI project at GSI and FAIR: Hypernuclei event reconstruction analysis

  C Rappold, S Bianchin, O Borodina, M Kavatsyuk, F Maas, S Minami, D Nakajima, B Ozel, J Pochodzalla, T R Saito, W Trautmann
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  ABSTRACT: The HypHI project aims to study hypernuclei by means of collisions of stable heavy ion and rare-isotope beams on stable target materials [1, 2]. As the first step (Phase 0), the feasibility of precise hypernuclear spectroscopy with heavy ion beams will be demonstrated with 6 Li beam at 2 A GeV impinged on a 12 C target by identifying 3 Λ H, 4 Λ H and 5 Λ He hypernuclei [3]. For preparation of the Phase 0 experiment scheduled on August 09, the data analysis method has already been un-der development with data produced by Monte Carlo (MC) Simulation of the full setup[4] in order to study the perfor-mance of the proposed setup and to estimate the physics outcome. After the first study reported in ref.[4], two sets of drift chambers were included in the experimental setup to increase tracking information, as shown in the figure of ref. [5]. Thank to this new tracking information, a new approach of the data analysis could been considered. With sufficient available detectors in the proposed setup, pattern recognition algorithms can be used to build track candi-dates in the earliest steps of the data analysis. Those meth-ods are commonly used offline and/or online to reduce the data flow and to consider anything but track candidates. This particular step had to be included to the data analy-sis of the Phase 0 experiment because of time consuming and outdated MC simulation input of the previous analysis code. Among viable global methods of pattern recognition, a specific Fuzzy Radon method so called Hough Transform [6] is adopted and implemented in the new data analysis. This implementation of the Hough transform algorithm for track recognition was a good opportunity to reorganize the previous analysis code. The current structure of the algo-rithm is as follow : • Hit extraction from detectors.
• Article: First measurements of Λ and Σ0 hyperons in elementary electroproduction at MAMI

  P. Achenbach, C. Ayerbe Gayoso, J.C. Bernauer, S. Bianchin, R. Böhm, O. Borodina, D. Bosnar, V. Bozkurt, L. Debenjak, A. Denig, [......], L. Nungesser, B. Özel-Tashenov, J. Pochodzalla, M. Potokar, Ch. Rappold, T.R. Saito, S. Sánchez Majos, B.S. Schlimme, S. Širca, M. Weinriefer
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  ABSTRACT: Since 2008 the magnetic spectrometer Kaos, dedicated to the detection of charged kaons, is operating at the 1.5 GeV electron beam of MAMI at the Institut für Kernphysik in Mainz, Germany. The strangeness programme performed in 2008–9 is addressing some important issues in the field of elementary kaon photoelectro-production reactions. The identification of Λ and Σ0 hyperons in the missing mass spectra from kaon production off a liquid hydrogen target demonstrates the capability of the extended facility to perform strangeness electro-production spectroscopy at low momentum transfers . Systematic uncertainties in the cross-section extraction from the data are discussed.
  Nuclear Physics A. 835:313-316.
• Article: The HypHI Phase 0 experiment

  T.R. Saito, S. Bianchin, O. Borodina, V. Bozkurt, B. Göküzüm, M. Kavatsyuk, E. Kim, S. Minami, D. Nakajima, B. Özel-Tashenov, [......], H. Sugimura, T. Takahashi, G.J. Tambave, K. Tanida, K. Tamura, M. Träger, W. Trautmann, S. Voltz, C.J. Yoon, K. Yoshida
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  ABSTRACT: The HypHI Phase 0 experiment to demonstrate the feasibility of precise hypernuclear spectroscopy with induced reactions of heavy ion beams was performed at GSI in August and October in 2009, with a projectile of 6Li at 2 A GeV impinged on carbon graphite target with a thickness of 8 g/cm2. The experiment mainly aims to reconstruct events of 3ΛH, 4ΛH and 5ΛHe by observing the π− decay channel. Details of the HypHI Phase 0 experiment performed in August in 2009 will be discussed.
  Nuclear Physics A. 835:110-116.
• Article: Event reconstruction methods for the HypHI Phase 0 experiment at GSI

  C. Rappold, T.R. Saito, S. Bianchin, O. Borodina, M. Kavatsyuk, F. Maas, S. Minami, D. Nakajima, B. Özel-Tashenov, W. Trautmann
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  ABSTRACT: The first experiment of the HypHI project, Phase 0, at GSI-Darmstadt performs the feasibility study of precise hypernuclear spectroscopy with heavy ion induced reactions by using the collision of 6Li at 2 A GeV on a 12C target. In preparation of the Phase 0 experiment, simulation studies have been performed with a dedicated event reconstruction procedure. Details of this procedure will be discussed in this paper as well as the physics motivation of the Phase 0 and the experimental setup used during simulations. Expected results of the experiment will also be discussed.
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.