P. Zolnierczuk

Publications (4)2.41 Total impact

• Source

  Available from: ic.ac.uk

  Article: Meson production in proton-nucleus and nucleus-nucleus collisions

  W Cassing, U Mosel, T Vetter, K Weber, Gy Wolf, V Metag, O W B Schult, W Borgs, D Gotta, A Hamacher, [......], H Stechemesser, G Stollwerk, B Kamys, St Kistryn, L Jarczyk, P Zolnierczuk, K Pysz, J Smyrski, A Strzalkowski, B Styczen
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  ABSTRACT: The production of K+ or η mesons in proton-nucleus reactions is analysed with respect to primary nucleon-nucleon (NN → NΛK+ or NNη) and secondary pion-nucleon (πN → K+Λ or ηN) production channels on the basis of a phase-space model employing Hartree-Fock groundstate momentum distributions and free on-shell production processes. The phase-space model adopted here compares well for meson production with more involved simulations based on VUU transport equations. Whereas for K+ production in proton-nucleus reactions the secondary channel clearly dominates at subthreshold energies, η mesons arise from primary and secondary processes with roughly the same order of magnitude. Detailed VUU calculations show that the relative weight of the various channels for nucleus-nucleus reactions is quite different as compared to the proton-nucleus case since Δ-resonance excitation and inelastic Δ-nucleon collisions are much more frequent.
  Physica Scripta 08/2006; 48(2):194. · 1.20 Impact Factor
• Article: A dedicated 0° facility for threshold particle production studies at COSY

  M Büscher, K Sistemich, V Abaev, U Bechstedt, P Birien, W Borgs, W Cassing, S Dienel, H Dombrowski, S V Dshemuchadze, [......], Chr Schneidereit, O W B Schult, H Seyfarth, V Shelkov, J Smyrski, A Strzalkowski, K -H Watzlawik, B Zh Zalyhanov, N I Zhuravlev, P Zolnierczuk
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  ABSTRACT: A universal facility is in preparation for the study of particle production in proton-nucleus reactions below the nucleon-nucleon threshold. The device will be located at the internal target position TP2 at COSY-Jülich and will consist of three dipole magnets. This 0° Facility will separate ejectiles from the circulating proton beam and allow momentum and angle analysis both for positively and negatively charged particles. A major goal of the experimental program is the investigation of the K+-meson production at projectile energies below the NN threshold. The detector concept for these studies is described and also an overview over further planned experiments is given.
  Physica Scripta 08/2006; 48(1):50. · 1.20 Impact Factor
• Article: Plans for investigations of subthreshold K+ production in p+A collisions

  O.W.B. Schult, K. Sistemich, V. Koptev, H. Müller, W. Cassing, L. Jarczyk, V.I. Komarov, A. Sibirtsev, J. Ernst, R. Santo, [......], H. Stechemesser, A. Strzalkowski, W. Tenten, S.V. Trusov, V. Chernyshev, K.-H. Watzlawik, B.Zh. Zalykhanov, N.I. Zhuravlev, P. Zolnierczuk, K. Zwoll
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  ABSTRACT: We plan to investigate sub-threshold K+ production in proton bombardment of atomic nuclei in order to study the reaction mechanism through a measurement of the double differential cross section and of K+ p and K+ d coincidences. The status of the theoretical studies is summarized, and the spectrometer to be installed in the COSY ring is briefly described.
  Nuclear Physics A.
• Source

  Available from: Gogi Macharashvili

  Article: Forward K+ production in subthreshold pA collisions at 1.0 GeV

  V. Koptev, M. Büscher, H. Junghans, M. Nekipelov, K. Sistemich, H. Ströher, V. Abaev, H. -H. Adam, R. Baldauf, S. Barsov, [......], A. Strzalkowski, K.-H. Watzlawik, C. Wilkin, P. Wüstner, S. Yashenko, B. Zalikhanov, N Zhuravlev, P. Zolnierczuk, K. Zwoll, I. Zychor
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  ABSTRACT: This version is available at the following Publisher URL: http://prl.aps.org