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1. Wide-acceptance measurement of the K−/K+ ratio from Ni+Ni collisions at 1.91A GeV

Author

Mile Dželalija, M. Korolija, A. Lebedev, Xavier Bernard Lopez, P. Koczon, Ivana Weber, A. Mangiarotti, Ralf Peter Averbeck, M. Merschmeyer, M. Kirejczyk, Anton Andronic, Johann Marton, Valerie Ramillien Barret, K. Wiśniewski, R. Kotte, Pascal Dupieux, A. Reischl, N. Herrmann, K. D. Hildenbrand, Laura Fabbietti, R. H. Munzer, Nicole Bastid, D. Pelte, H. S. Xu, I. E. Yushmanov, V. Simion, A. Le Fèvre, I. M. Deppner, Y. Leifels, Mladen Kiš, K. Suzuki, Jianli Liu, T. I. Kang, M. Berger, W. Reisdorf, Peter Wagner, Piotr Jan Gasik, Paul Buehler, T. Matulewicz, Z. Fodor, Vladislav Manko, Krzysztof Piasecki, Z. Seres, E. Widmann, K. Siwek-Wilczyńska, Mihai Petrovici, Igor Gašparić, O. Czerwiakowa, P. Crochet, Z. Basrak, Fouad Rami, P. Schmidt, J. Kecskemeti, K. S. Sim, A. Zhilin, B. Sikora, Roman Čaplar, Y. Grishkin, Johann Zmeskal, O. N. Hartmann, Byung-Sik Hong, V. Zinyuk, Zhigang Xiao, Michael Cargnelli, Yongsun Kim, M. L. Benabderrahmane, V. T. Smolyankin, M. S. Ryu, A. Schüttauf, Y. H. Zhang, E. Cordier, Gabriel Stoicea, and Z. Tyminski

Subjects
Physics, Meson, 010308 nuclear & particles physics, Plane (geometry), Nuclear Theory, Kinetic energy, 7. Clean energy, 01 natural sciences, Synchrotron, Spectral line, law.invention, Nuclear physics, Distribution (mathematics), law, Yield (chemistry), 0103 physical sciences, High Energy Physics::Experiment, Polar coordinate system, Nuclear Experiment, 010306 general physics
Abstract

The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semicentral collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K−/K+ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of ϕ(1020) meson decays to the K− yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of K− to K+ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at 1.23A and 1.76A GeV indicate that after inclusion of the ϕ meson decay contribution to the K− production no difference between the slopes of the K− and K+ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the ϕ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of Λ(1520)→pK− decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance.

Published
2019
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2. SiΛvio: A trigger for Λ-hyperons

Author

Z. Fodor, A. Lebedev, K. Siwek-Wilczyńska, Xavier Bernard Lopez, P. Koczon, Z. Basrak, Xiang Yang Zhang, Vladislav Manko, K. Wiśniewski, Fouad Rami, Mihai Petrovici, K. Suzuki, Anton Andronic, T. Yamazaki, W. Reisdorf, Valerie Ramillien Barret, P. Gasik, I. Carevic, T. I. Kang, Eberhard Widmann, J. L. Liu, Y. Leifels, Byung-Sik Hong, A. Zhilin, Paul Kienle, P. Schmidt, A. Reischl, K. S. Sim, Johann Marton, Pascal Dupieux, Y. Grishkin, O. N. Hartmann, V. Charviakova, Ralf Peter Averbeck, Z. Tyminski, N. Herrmann, K. D. Hildenbrand, J. Zmeskal, Igor Gašparić, J. Kecskemeti, M. Kirejczyk, M. Berger, R. H. Munzer, B. Sikora, Paul Buehler, Nicole Bastid, Z. Seres, I. Deppner, Krzysztof Piasecki, A. Schüttauf, R. Čaplar, M. Dželalija, M. Kiš, V. T. Smolyankin, M. S. Ryu, Michael Cargnelli, Zhigang Xiao, Yongsun Kim, M. L. Benabderrahmane, P. Wagner, R. Kotte, V. Simion, T. Matulewicz, P. Crochet, V. Zinyuk, Laura Fabbietti, and I. E. Yushmanov

Subjects
Physics, silicon, Mesytec, APV25, MIPS, Λ, trigger, Nuclear and High Energy Physics, Silicon, Spectrometer, 010308 nuclear & particles physics, Detector, Hyperon, chemistry.chemical_element, Lambda-hyperons, 01 natural sciences, Vertex (geometry), Nuclear physics, Si Lambda vio, chemistry, 0103 physical sciences, 010306 general physics, Instrumentation
Abstract

As online trigger for events containing Λ hyperons in p+p collisions at 3.1 GeV a silicon-based device has been designed and built. This system has been integrated close to the target region within the FOPI spectrometer at GSI and was also employed as a tracking device to improve the vertex reconstruction of secondary decays. The design of the detector components, read-out, the trigger capability as well as the tracking performance are presented. An enrichment factor of about 14 was achieved for events containing a Λ-hyperon candidate.

Published
2014
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3. Systematics of azimuthal asymmetries in heavy ion collisions in the regime

Author

M. Kiš, R. Kotte, M. S. Ryu, Philippe Crochet, Z. Tyminski, M. Dželalija, Krzysztof Piasecki, Gabriel Stoicea, T. I. Kang, Fouad Rami, K. D. Hildenbrand, M. Korolija, H. S. Xu, W. Reisdorf, M. L. Benabderrahmane, Y. Leifels, A. Zhilin, R. Čaplar, Pascal Dupieux, I. E. Yushmanov, Byung-Sik Hong, Z. Basrak, M. R. Stockmeier, Z. Fodor, M. Kirejczyk, W. Neubert, Zhigang Xiao, D. Wohlfarth, Y. J. Kim, J. Kecskemeti, K. S. Sim, Y. Grishkin, K. Siwek-Wilczyńska, Nicole Bastid, A. Lebedev, M. Merschmeyer, V. T. Smolyankin, Valerie Ramillien Barret, V. Simion, Xavier Bernard Lopez, A. Schüttauf, Anton Andronic, P. Gasik, N. Herrmann, T. Matulewicz, B. Sikora, T. Kress, K. Wiśniewski, Z. Seres, P. Koczon, Mihai Petrovici, O. N. Hartmann, and Ralf Peter Averbeck

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Elliptic flow, chemistry.chemical_element, Nuclear equation of state, Observable, Nuclear physics, Azimuth, Xenon, chemistry, Isospin, Bibliography, Neutron
Abstract

Using the large acceptance apparatus FOPI, we study central and semi-central collisions in the reactions (energies in A GeV are given in parentheses): 40Ca + 40Ca (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), 58Ni + 58Ni (0.15, 0.25, 0.4), 96Ru + 96Ru (0.4, 1.0, 1.5), 96Zr + 96Zr (0.4, 1.0, 1.5), 129Xe + CsI (0.15, 0.25, 0.4), 197Au + 197Au (0.09, 0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include directed and elliptic flow. The data are compared to earlier data where possible and to transport model simulations. A stiff nuclear equation of state is found to be incompatible with the data. Evidence for extra-repulsion of neutrons in compressed asymmetric matter is found.

Published
2012
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4. Systematics of central heavy ion collisions in the regime

Author

Philippe Crochet, K. D. Hildenbrand, P. Koczon, Z. Fodor, Mihai Petrovici, O. N. Hartmann, M. Kiš, M. Kirejczyk, A. Lebedev, Nicole Bastid, Z. Basrak, Krzysztof Piasecki, Y. Leifels, H. S. Xu, K. Siwek-Wilczyńska, M. R. Stockmeier, K. Wiśiewski, D. Wohlfarth, Y. J. Kim, K. S. Sim, Zhigang Xiao, M. Korolija, A. Zhilin, I. E. Yushmanov, J. Kecskemeti, Y. Grishkin, M. Merschmeyer, Valerie Ramillien Barret, V. Simion, M. L. Benabderrahmane, A. Schüttauf, Pascal Dupieux, Byung-Sik Hong, T. Matulewicz, R. Čaplar, M. S. Ryu, W. Neubert, Ralf Peter Averbeck, V. T. Smolyankin, Z. Seres, W. Reisdorf, R. Kotte, T. Kress, Piotr Jan Gasik, N. Herrmann, B. Sikora, Xavier Bernard Lopez, Anton Andronic, Z. Tyminski, M. Dželalija, Fouad Rami, Gabriel Stoicea, and T. I. Kang

Subjects
Physics, Nuclear and High Energy Physics, Equation of state, Particle physics, 010308 nuclear & particles physics, chemistry.chemical_element, Observable, 01 natural sciences, Nuclear physics, Xenon, chemistry, Nucleosynthesis, Isospin, 0103 physical sciences, Cluster (physics), Bibliography, Rapidity, 010306 general physics
Abstract

Using the large acceptance apparatus FOPI, we study central collisions in the reactions (energies in A GeV are given in parentheses): Ca-40 + Ca-40 (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), Ni-58 + Ni-58 (0.15, 0.25, 0.4), Ru-96+Ru-96 (0.4, 1.0. 1.5), (96)zr+(96)zr 1.0, 1.5), Xe-129+CsI (0.15, 0.25, 0.4), Au-197 + Au-197 (0.09, 0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include cluster multiplicities, longitudinal and transverse rapidity distributions and stopping, and radial flow. The data are compared to earlier data where possible and to transport model simulations. (C) 2010 Elsevier B.V. All rights reserved.

Published
2010
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5. Systematics of pion emission in heavy ion collisions in the regime

Author

T. I. Kang, K. D. Hildenbrand, M. Korolija, Zhigang Xiao, M. Merschmeyer, Z. Seres, Valerie Ramillien Barret, Pascal Dupieux, K. Wiśniewski, P. Koczon, Z. Fodor, Philippe Crochet, Gabriel Stoicea, M. Kiš, T. Kress, Y. Leifels, M. R. Stockmeier, N. Herrmann, X. Lopez, Fouad Rami, Y. J. Kim, A. Lebedev, H. S. Xu, D. Wohlfarth, K. S. Sim, Y. Grishkin, Byung-Sik Hong, Z. Tyminski, J. Kecskemeti, R. Kotte, R. Čaplar, W. Neubert, Z. Basrak, M. Dželalija, M. Kirejczyk, B. Sikora, V. T. Smolyankin, V. Simion, Anton Andronic, A. Zhilin, T. Matulewicz, A. Schüttauf, M. L. Benabderrahmane, Nicole Bastid, I. E. Yushmanov, W. Reisdorf, Mihai Petrovici, O. N. Hartmann, K. Siwek-Wilczyńska, and M. S. Ryu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Elliptic flow, Observable, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Transverse plane, Pion, Isospin, 0103 physical sciences, Rapidity, 010306 general physics, Anisotropy
Abstract

Using the large acceptance apparatus FOPI, we study pion emission in the reactions (energies in A GeV are given in parentheses): 40Ca + 40Ca (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), 96Ru + 96Ru (0.4, 1.0, 1.5), 96Zr + 96Zr (0.4, 1.0, 1.5), 197Au + 197Au (0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include longitudinal and transverse rapidity distributions and stopping, polar anisotropies, pion multiplicities, transverse momentum spectra, ratios ( π + / π − ) of average transverse momenta and of yields, directed flow, elliptic flow. The data are compared to earlier data where possible and to transport model simulations.

Published
2007
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6. Influence ofϕmesons on negative kaons in Ni + Ni collisions at1.91A GeV beam energy

Author

M. Kiš, Philippe Crochet, Ken Suzuki, Byung-Sik Hong, Laura Fabbietti, Krzysztof Piasecki, Y. Leifels, Xavier Bernard Lopez, Zhigang Xiao, K. D. Hildenbrand, Fouad Rami, Ya-Peng Zhang, R. Čaplar, P. Wagner, Anton Andronic, Y. Grishkin, M. Dželalija, Paul Buehler, R. Kotte, J. L. Liu, Y. J. Kim, K. S. Sim, P. Gasik, I. E. Yushmanov, K. Siwek-Wilczyńska, W. Reisdorf, A. Le Fèvre, M. L. Benabderrahmane, Johann Marton, V. Simion, Mihai Petrovici, Vladislav Manko, O. N. Hartmann, V. T. Smolyankin, M. S. Ryu, T. Matulewicz, Michael Cargnelli, J. Zmeskal, V. Zinyuk, A. Zhilin, B. Sikora, N. Herrmann, A. Schüttauf, M. Berger, Z. Seres, T. I. Kang, I. Weber, Ralf Peter Averbeck, Z. Tyminski, Z. Fodor, Pascal Dupieux, O. Czerwiakowa, Z. Basrak, Eberhard Widmann, P. Schmidt, A. Lebedev, K. Wis̈niewski, P. Koczon, I. M. Deppner, Valerie Ramillien Barret, A. Reischl, M. Kirejczyk, Igor Gašparić, J. Kecskemeti, R. H. Munzer, and Nicole Bastid

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, Nuclear Theory, Inverse, High Energy Physics::Experiment, Nuclear Experiment, Kinetic energy, Beam energy
Abstract

$\ensuremath{\phi}$ and ${\mathrm{K}}^{\ensuremath{-}}$ mesons from Ni+Ni collisions at the beam energy of $1.91A$ GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semicentral events amounting to 52% of the total cross section. The phase-space distributions, and the total yield of ${\mathrm{K}}^{\ensuremath{-}}$, as well as the kinetic energy distribution and the total yield of $\ensuremath{\phi}$ mesons are presented. The $\ensuremath{\phi}/$ ${\mathrm{K}}^{\ensuremath{-}}$ ratio is found to be $0.44\ifmmode\pm\else\textpm\fi{}0.07{(\text{stat})}_{\ensuremath{-}0.10}^{+0.16}(\text{syst})$, meaning that about 22% of ${\mathrm{K}}^{\ensuremath{-}}$ mesons originate from the decays of $\ensuremath{\phi}$ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signaling that a considerable share of gap between the slopes of ${\mathrm{K}}^{+}$ and ${\mathrm{K}}^{\ensuremath{-}}$ could be explained by the contribution of $\ensuremath{\phi}$ mesons to negative kaons.

Published
2015
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7. Shape parameters of the participant source in Ru + Ru collisions at

Author

V. Simion, M. Dželalija, E. Cordier, K. D. Hildenbrand, A. Schuettauf, Gabriel Stoicea, N. Herrmann, V. T. Smolyankin, Philippe Crochet, Z. Tyminski, M. L. Benabderrahmane, Z. Fodor, P. Wagner, A. Gobbi, B. de Schauenburg, Fouad Rami, Igor Gašparić, Y. Leifels, J. Kecskemeti, M. Merschmeyer, Valerie Ramillien Barret, Z. Basrak, I. E. Yushmanov, R. Kotte, D. Pelte, M. R. Stockmeier, D. Wohlfarth, Z. Seres, A. Bendarag, M. Kirejczyk, Nicole Bastid, R. Čaplar, M. M. Smolarkiewicz, Y. Grishkin, Zhigang Xiao, Yongsun Kim, Mihai Petrovici, Byung-Sik Hong, O. N. Hartmann, T. Kress, Alexandre Lebedev, W. Neubert, J. P. Alard, Vladislav Manko, W. Reisdorf, I. J. Soliwoda, A. Mangiarotti, A. Zhilin, Pascal Dupieux, M. Korolija, K. Wiśniewski, P. Koczon, B. Sikora, Xavier Bernard Lopez, Anton Andronic, K. S. Sim, D. Moisa, and K. Siwek-Wilczyńska

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Gaussian, Nuclear Theory, Nuclear physics, Momentum, symbols.namesake, Cross section (physics), Flow (mathematics), Phase space, Isospin, symbols, Impact parameter, Nuclear Experiment
Abstract

New results on nuclear collective flow are presented for central and semi-central Ru + Ru collisions at 400 A MeV measured with the FOPI detector at GSI-Darmstadt. The source shape parameters, flow angle and aspect ratios, are extracted from Gaussian fits to in-plane and out-of-plane momentum distributions. The orientation and the shape of the source exhibit different trends according to the investigated phase space region. The shape parameters of the participant source are studied as a function of the particle mass and collision centrality. The flow angle is found to be independent of the particle mass. Both the flow angle and the aspect ratios depend sensitively on the impact parameter. Detailed comparisons with the predictions of the isospin quantum molecular dynamics model are performed. It is shown in particular that the source shape parameters permit to extract information on the in-medium nucleon–nucleon cross section.

Published
2004
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8. Azimuthal emission patterns ofK+and ofK−mesons in Ni + Ni collisions near the strangeness production threshold

Author

Philippe Crochet, M. S. Ryu, Paul Buehler, W. Reisdorf, Johann Zmeskal, Y. Leifels, P. Wagner, Michael Cargnelli, R. Kotte, Elena Bratkovskaya, Zhigang Xiao, Igor Gašparić, A. Lebedev, Xavier Bernard Lopez, Y. J. Kim, K. S. Sim, A. Le Fèvre, J. Kecskemeti, A. Reischl, Anton Andronic, P. Gasik, Vladislav Manko, K. Wiśniewski, M. Kiš, Valerie Ramillien Barret, Pascal Dupieux, Fouad Rami, Johann Marton, K. Siwek-Wilczyńska, R. Čaplar, P. Koczon, M. Dželalija, I. Deppner, I. E. Yushmanov, Byung-Sik Hong, Ken Suzuki, N. Herrmann, R. H. Munzer, V. T. Smolyankin, Z. Basrak, V. Simion, Nicole Bastid, A. Zhilin, Mihai Petrovici, O. N. Hartmann, Z. Fodor, A. Schüttauf, M. Berger, B. Sikora, M. L. Benabderrahmane, Z. Seres, T. I. Kang, Laura Fabbietti, T. Matulewicz, K. D. Hildenbrand, V. Zinyuk, Eberhard Widmann, Krzysztof Piasecki, Ralf Peter Averbeck, Z. Tyminski, C. Hartnack, P. Schmidt, M. Kirejczyk, Ya-Peng Zhang, J. L. Liu, I. Carevic, and Y. Grishkin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Elliptic flow, Strangeness production, Kinetic energy, Nuclear matter, 7. Clean energy, Azimuth, Nuclear physics, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract

Azimuthal emission patterns of $K^\pm$ mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum $p_{T}$ integrated directed and elliptic flow of $K^{+}$ and $K^{-}$ mesons as well as the centrality dependence of $p_{T}$ - differential directed flow of $K^{+}$ mesons are compared to the predictions of HSD and IQMD transport models. The data exhibits different propagation patterns of $K^{+}$ and $K^{-}$ mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for $K^{+}$ mesons and attractive for $K^{-}$ mesons.

Published
2014
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9. Measurement ofK*(892)0andK0mesons inAl+Alcollisions at 1.9AGeV

Author

Y. Grishkin, Byung-Sik Hong, Z. Seres, J. Zmeskal, Mihai Petrovici, R. Kotte, D. Pelte, Z. Fodor, W. Neubert, Z. Tyminski, M. Dželalija, M. Korolija, Piotr Jan Gasik, Z. Basrak, Johann Marton, Nicole Bastid, A. Schüttauf, P. Crochet, A. Lebedev, Igor Gašparić, Peter Wagner, Paul Buehler, Laura Fabbietti, J. Kecskemeti, R. Čaplar, Vladislav Manko, M. L. Benabderrahmane, W. Reisdorf, Krzysztof Piasecki, M. Merschmeyer, O. N. Hartmann, Valerie Ramillien Barret, V. T. Smolyankin, M. S. Ryu, A. Zhilin, Xiang Yang Zhang, K. Siwek-Wilczyńska, Paul Kienle, Michael Cargnelli, Y. Leifels, Pascal Dupieux, Xavier Bernard Lopez, P. Koczon, K. S. Sim, I. Fijał-Kirejczyk, Zhigang Xiao, Anton Andronic, T. Yamazaki, Yongsun Kim, M. Kirejczyk, Fouad Rami, M. Kiš, I. E. Yushmanov, V. Simion, E. Widmann, T. Matulewicz, B. Sikora, K. Suzuki, N. Herrmann, K. D. Hildenbrand, T. I. Kang, K. Wiśniewski, and P. Schmidt

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Model prediction, 0103 physical sciences, Yield ratio, Production (computer science), 010306 general physics, 01 natural sciences
Abstract

A new measurement of subthreshold ${K}^{*}(892){}^{0}$ and ${K}^{0}$ production is presented. The experimental data complete the measurement of strange particles produced in $\mathrm{Al}+\mathrm{Al}$ collisions at 1.9$A$ GeV measured with the FOPI detector at SIS at GSI (Darmstadt). The ${K}^{*}(892){}^{0}/{K}^{0}$ yield ratio is found to be $0.0315\ifmmode\pm\else\textpm\fi{}0.006(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{syst}.)$ and is in good agreement with the transport model prediction. These measurements provide information on the in-medium cross section of ${K}^{+}$-${\ensuremath{\pi}}^{\ensuremath{-}}$ fusion, which is the dominant process in subthreshold ${K}^{*}(892){}^{0}$ production.

Published
2010
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10. Measurement of the In-MediumK0Inclusive Cross Section inπ−-Induced Reactions at1.15 GeV/c

Author

M. Rogowska, Mihai Petrovici, Eberhard Widmann, R. Kotte, Z. Tyminski, Pascal Dupieux, A. Lebedev, Laura Fabbietti, Z. Basrak, T. I. Kang, Philippe Crochet, Byung-Sik Hong, K. D. Hildenbrand, P. Schmidt, Krzysztof Piasecki, Michael Cargnelli, Fouad Rami, K. Suzuki, Z. Seres, Elena Bratkovskaya, A. Mangiarotti, Y. Leifels, K. Wiśniewski, K. Siwek-Wilczyńska, Johann Marton, P. Koczon, Paul Buehler, E. Cordier, Igor Gašparić, J. Kecskemeti, M. Korolija, I. E. Yushmanov, M. Kirejczyk, M. Merschmeyer, N. Herrmann, Valerie Ramillien Barret, O. N. Hartmann, Paul Kienle, I. M. Deppner, A. Reischl, Nicole Bastid, R. Čaplar, Y. Grishkin, Vladislav Manko, M. Dželalija, M. Kiš, V. Simion, Z. Fodor, V. T. Smolyankin, M. S. Ryu, J. Zmeskal, A. Schüttauf, T. Matulewicz, A. Zhilin, M. L. Benabderrahmane, Xavier Bernard Lopez, Anton Andronic, T. Yamazaki, P. Gasik, B. Sikora, W. Reisdorf, Xiang Yang Zhang, W. Cassing, Z. G. Xiao, Y. J. Kim, and K. S. Sim

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Strangeness production, Strangeness, Nuclear matter, 7. Clean energy, 01 natural sciences, Momentum, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Sensitivity (control systems), Nuclear Experiment, 010306 general physics
Abstract

The K{sup 0} meson production by {pi}{sup -} mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K{sup 0} mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20{+-}5 MeV at normal nuclear matter density.

Published
2009
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11. Subthreshold production ofΣ(1385)baryons in Al+Al collisions at1.9AGeV

Author

Johann Marton, X. Lopez, Byung-Sik Hong, P. Wagner, Igor Gašparić, J. Kecskemeti, R. Kotte, D. Pelte, Philippe Crochet, W. Neubert, Z. Basrak, M. Merschmeyer, T. I. Kang, Z. Seres, K. Siwek-Wilczyńska, N. Herrmann, Valerie Ramillien Barret, Paul Kienle, Y. J. Kim, V. Simion, K. S. Sim, M. Dzelalija, J. Zmeskal, Eberhard Widmann, D. Wohlfarth, E. Cordier, Mihai Petrovici, A. Schüttauf, O. N. Hartmann, Y. Grishkin, Y. Leifels, M. L. Benabderrahmane, Z. Fodor, T. Matulewicz, Fouad Rami, Michael Cargnelli, Gabriel Stoicea, Paul Buehler, M. Kiš, P. Schmidt, Laura Fabbietti, K. D. Hildenbrand, Vladislav Manko, Pascal Dupieux, Z. Tyminski, W. Reisdorf, I. E. Yushmanov, R. Čaplar, Zhigang Xiao, A. Zhilin, Anton Andronic, Xiang Yang Zhang, T. Yamazaki, K. Wiśniewski, P. Koczon, V. T. Smolyankin, M. S. Ryu, K. Suzuki, B. Sikora, A. Lebedev, Krzysztof Piasecki, M. Korolija, M. Kirejczyk, and Nicole Bastid

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Subthreshold conduction, Nuclear Theory, Sigma, Strangeness production, Strangeness, Lambda, 01 natural sciences, Particle identification, Sigma baryon, Baryon, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

First measurement of subthreshold {sigma}(1385) production is presented. Experimental data are presented for Al+Al reactions at 1.9A GeV measured with the FOPI detector at SIS/GSI. The {sigma}(1385)/{lambda} ratio is found to be in good agreement with the transport and statistical model predictions. The results allow for a better understanding of subthreshold strangeness production and strangeness exchange reaction which is the dominant process for K{sup -} production below and close-to threshold.

Published
2007
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12. Isospin dependence of relative yields ofK+andK0mesons at 1.528AGeV

Author

Z. Fodor, Z. Tyminski, X. Lopez, Nicole Bastid, M. Kiš, Igor Gašparić, J. Kecskemeti, Z. Basrak, N. Herrmann, Y. J. Kim, K. S. Sim, R. Kotte, D. Pelte, Philippe Crochet, Peter Wagner, M. Merschmeyer, Y. Grishkin, Zhigang Xiao, Valerie Ramillien Barret, R. Čaplar, G. Ferini, M. Dželalija, A. Lebedev, Pascal Dupieux, B. Sikora, Xiang Yang Zhang, A. Zhilin, Y. Leifels, E. Cordier, V. T. Smolyankin, T. I. Kang, Fouad Rami, I. E. Yushmanov, M. Kirejczyk, M. L. Benabderrahmane, M. S. Ryu, D. Wohlfarth, Z. Seres, Gabriel Stoicea, M. Korolija, K. D. Hildenbrand, A. Schüttauf, V. Simion, K. Wiśniewski, P. Koczon, Anton Andronic, Byung-Sik Hong, Theodoros Gaitanos, W. Neubert, K. Siwek-Wilczyńska, W. Reisdorf, Mihai Petrovici, and O. N. Hartmann

Subjects
Mass number, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear matter, Kinetic energy, 7. Clean energy, 01 natural sciences, Nuclear physics, Mean field theory, Isospin, 0103 physical sciences, Sensitivity (control systems), Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

Results on $K^+$ and $K^0$ meson production in $^{96}_{44}$Ru + $^{96}_{44}$Ru and $^{96}_{40}$Zr + $^{96}_{40}$Zr collisions at a beam kinetic energy of 1.528$A$ GeV, measured with the FOPI detector at GSI-Darmstadt, are investigated as a possible probe of isospin effects in high density nuclear matter. The measured double ratio ($K^+/K^0$)$_{Ru}$/($K^+/K^0$)$_{Zr}$ is compared to the predictions of a thermal model and a Relativistic Mean Field transport model using two different collision scenarios and under different assumptions on the stiffness of the symmetry energy. We find a good agreement with the thermal model prediction and the assumption of a soft symmetry energy for infinite nuclear matter while more realistic transport simulations of the collisions show a similar agreement with the data but also exhibit a reduced sensitivity to the symmetry term.

Published
2007
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13. Charged pion production in4496Ru+4496Rucollisions at400Aand1528AMeV

Author

D. Wohlfarth, A. Gobbi, Z. Fodor, M. R. Stockmeier, A. Zhilin, Zhigang Xiao, Z. Basrak, Y. Grishkin, K. S. Sim, V. Simion, T. Kress, Yongsun Kim, Byung-Sik Hong, Nicole Bastid, W. Reisdorf, A. Lebedev, A. Schüttauf, Y. Leifels, P. Crochet, W. Neubert, K. Wiśniewski, Pascal Dupieux, A. Mangiarotti, P. Koczon, R. Čaplar, M. Korolija, Z. Seres, M. Dželalija, R. Kotte, D. Pelte, V. T. Smolyankin, Mihai Petrovici, O. N. Hartmann, M. Kirejczyk, I. E. Yushmanov, M. L. Benabderrahmane, Peter Wagner, J. Kecskemeti, M. Merschmeyer, Valerie Ramillien Barret, N. Herrmann, K. D. Hildenbrand, Gabriel Stoicea, Z. Tyminski, K. Siwek-Wilczyńska, Xavier Bernard Lopez, Anton Andronic, B. Sikora, and Fouad Rami

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pion, 010308 nuclear & particles physics, Nuclear Theory, 0103 physical sciences, Production (economics), Nuclear Experiment, 010306 general physics, 01 natural sciences
Published
2005
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14. First analysis of anisotropic flow with Lee--Yang zeroes

Author

Mihai Petrovici, O. N. Hartmann, Nicolas Borghini, P. Koczon, M. L. Benabderrahmane, Vladislav Manko, Byung-Sik Hong, N. Herrmann, W. Neubert, I. Gapari, M. M. Smolarkiewicz, B. Sikora, K. Siwek-Wilczyska, I. J. Soliwoda, Philippe Crochet, A. Zhilin, A. Mangiarotti, K. D. Hildenbrand, Nicole Bastid, A. Schuettauf, W. Reisdorf, Y. Grishkin, Xavier Bernard Lopez, A. Lebedev, Anton Andronic, D. Moisa, M. Merschmeyer, V. Simion, Valerie Ramillien Barret, Y. Leifels, Zhigang Xiao, Yongsun Kim, Z. Fodor, A. Gobbi, M. Dbeelalija, Fouad Rami, M. R. Stockmeier, M. Kirejczyk, V. T. Smolyankin, Z. Tyminski, I. E. Yushmanov, D. Wohlfarth, J. Kecskemeti, K. S. Sim, R. Kotte, D. Pelte, E. Cordier, Gabriel Stoicea, K. Winiewski, M. Korolija, R. Čaplar, Pascal Dupieux, Z. Basrak, Jean-Yves Ollitrault, Z. Seres, T. Kress, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Elliptic flow, Detector, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Azimuth, 0103 physical sciences, 25.70.-z, 25.75.Ld, Order (group theory), Nuclear Experiment (nucl-ex), 010306 general physics, Anisotropy, Nucleon, Nuclear Experiment, Cumulant, Energy (signal processing)
Abstract

We report on the first analysis of directed and elliptic flow with the new method of Lee--Yang zeroes. Experimental data are presented for Ru+Ru reactions at 1.69 AGeV measured with the FOPI detector at SIS/GSI. The results obtained with several methods, based on the event-plane reconstruction, on Lee--Yang zeroes, and on multi-particle cumulants (up to 5th order) applied for the first time at SIS energies, are compared. They show conclusive evidence that azimuthal correlations between nucleons and composite particles at this energy are largely dominated by anisotropic flow., Comment: 5 pages, 3 figures, submitted to Phys. Rev. C Rapid Com

Published
2005
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15. Nuclear Stopping from0.09Ato1.93A GeVand Its Correlation to Flow

Author

Philippe Crochet, V. Simion, Y. Leifels, Mihai Petrovici, O. N. Hartmann, Z. Fodor, K. Wisniewski, A. Gobbi, R. Čaplar, A. Schüttauf, Pascal Dupieux, Fouad Rami, I. E. Yushmanov, Xavier Bernard Lopez, K. S. Sim, P. Wagner, J. Mösner, J. P. Alard, Z. Seres, M. Merschmeyer, M. L. Benabderrahmane, R. Kotte, M. Dželalija, D. Pelte, Anton Andronic, M. Korolija, V. T. Smolyankin, Y. Grishkin, Byung-Sik Hong, Valerie Ramillien Barret, T. Kress, Z. Basrak, W. Neubert, K. Siwek-Wilczyńska, N. Herrmann, B. Sikora, Zhigang Xiao, Yongsun Kim, J. Kecskemeti, M. Kirejczyk, A. Zhilin, Nicole Bastid, Gabriel Stoicea, Z. Tyminski, P. Koczon, A. Lebedev, M. R. Stockmeier, D. Wohlfarth, K. D. Hildenbrand, W. Reisdorf, and B. de Schauenburg

Subjects
Nuclear physics, Physics, General Physics and Astronomy, Heavy ion, Nuclear Experiment, Excitation
Abstract

We present a complete systematics (excitation functions and system-size dependences) of global stopping and side flow for heavy ion reactions in the energy range between $0.09A$ and $1.93A\text{ }\text{ }\mathrm{GeV}$. For the heaviest system, $\mathrm{Au}+\mathrm{Au}$, we observe a plateau of maximal stopping extending from about $0.2A$ to $0.8A\text{ }\text{ }\mathrm{GeV}$ with a fast drop on both sides. The degree of stopping, which is shown to remain significantly below the expectations of a full stopping scenario, is found to be highly correlated to the amount of side flow.

Published
2004
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