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27 results on '"Berek, G."'

1. Excitation function of elliptic flow in Au + Au collisions and the nuclear matter equation of state

Author

Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, L., Berek, G., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Gasparic, I., Grishkin, Y., Hartmann, O. N., Herrmann, N., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Koczon, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Schauenburg, B., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M. R., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z.-G., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We present measurements of the excitation function of elliptic flow at midrapidity in Au + Au collisions at beam energies from 0.09 to 1.49 GeV per nucleon. For the integral flow, we discuss the interplay between collective expansion and spectator shadowing for three centrality classes. A complete excitation function of transverse momentum dependence of elliptiv flow is presented for the first time in this energy range, revealing a rapid change with incident energy below 0.4 AGeV, followed by an almost perfect scaling at the higher energies. The equation of state of compressed nuclear matter is addressed through comparisons to microscopic transport model calculations.

Published
2005

2. Excitation function of elliptic flow in Au + Au collisions and nuclear matter equation of state

Author

Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, L., Berek, G., Čaplar, Roman, Cordier, E., Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gašparić, Igor, Grishkin, Yu., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Mangiarotti, A., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., de Schauenburg, B., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńskak, K., Smolyankin, V., Stockmeier, M.R., Stoicea, G., Tyminski, Z., Wagner, P., Wiśniewski, K., Wohlfarth, D., Xiao, Z.-G., Yushmanov, I., and Zhiling, A.

Subjects
Nuclear Experiment, elliptic flow, compressed nuclear matter, equation of state
Abstract

We present measurements of the excitation function of elliptic flow at midrapidity in Au + Au collisions at beam energies from 0.09 to 1.49 GeV per nucleon. For the integral flow, we discuss the interplay between collective expansion and spectator shadowing for three centrality classes. A complete excitation function of transverse momentum dependence of elliptic flow is presented for the first time in this energy range, revealing a rapid change with incident energy below , followed by an almost perfect scaling at the higher energies. The equation of state of compressed nuclear matter is addressed through comparisons to microscopic transport model calculations.

Published
2005

3. Sub-threshold phi-meson yield in central 58Ni+58Ni collisions

Author

Mangiarotti, A., Herrmann, N., Maurenzig, P.R., Gobbi, A., Kotte, R., Kecskemeti, J., Leifels, Y., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Finck, C., Fodor, Z., Grishkin, Y., Hartmann, O., Hildenbrand, K.D., Hong, B., Kim, Y.J., Kirejczyk, M., Koczo, P., Korolija, M., Kress, T., Kutsche, R., Lebedev, A., Manko, V., Merschmeyer, M., Moisa, D., Nianine, A., Neubert, W., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., De Schauenburg, B., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczy, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanovi, I., Zhilinh, A, 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
High Energy Physics::Experiment, heavy ion collision, Sis, sub-threshold meson production, pseudo-vector mesons, phi-meson, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The fi-meson production cross section is measured for the first time at a sub-thresbold energy of 1.93 A GeV in 58-Ni + 58-Ni central collisions. The phi data were obtained within the acceptance of the CDC/Barrel subsystem of FOPI. For a sample of 4.7 x 10^6 central events, after background subtraction, 23 candidates were observed. Extensive GEANT simulations of the detector performance are shown in a thorough comparison to the real response, aiming at a good understanding of the apparatus and at a trustable determination of the efficiencies, production probability and possible systematic errors. A filter procedure is elaborated, which is meant to facilitate the comparison of any theoretical calculation or Dew data with the current ones. How to extrapolate the present value to a f-meson cross section in 4p is also discussed. This result on pseudo-vector mesons can now be compared to existing experimental knowledge for the same reaction at the same incident energy for various outgoing channels, K^+ and K^- included. A significant fraction (at least 20%) of the K^--mesons is originating in the decay of the phi, supporting the statement that the two channels are strongly correlated.

Published
2003

4. Subthreshold Phi-meson yield in central 58Ni+58Ni collisions at 1.93 AGeV

Author

Mangiarotti, A., Herrmann, N., Maurenzig, P. R., Gobbi, A., Kotte, R., Keczkemeti, J., Leifels, Y., Alard, J. P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Finck, C., Fodor, Z., Grishkin, Y., Hartmann, O., Hildenbrand, K. D., Hong, B., Kim, Y. J., Kirejczyk, M., Koczon, P., Korolija, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K. S., Manko, V., Merschmeyer, M., Moisa, D., Nianine, A., Neubert, W., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J. T., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

The Phi-meson production cross section is measured for the first time at a sub-threshold energy of 1.93 AGeV in 58Ni+58Ni collisions. The Phi data were obtained within the acceptance of the CDC/Barrel subsystem of the FOPI detector. For a sample of 4.7x106 central events, after background subtraction, 23 Phi candidates were observed. Extensive simulation calculations of the detector performance are shown in a detailed comparison to the data, aiming at a good understanding of the apparatus response and at a reliable determination of the efficiencies, production probability and possible systematic errors. A filter procedure is elaborated, which is meant to facilitate the comparison of any theoretical calculation with the data in the detector acceptance. How to extrapolate the result to a Phi-meson cross section in 4\pi is also discussed. This first result on pseudo-vector mesons can now be compared to existing data for the same reaction at the same incident energy for various outgoing channels, K+ and K- included. It suggests that a significant fraction (at least 20%) of the K--mesons is originating in the decay of the Phi showing that the two channels are strongly correlated. A first comparison to existing model calculations indicates the possible role of the Rho-meson channels in Phi production.

Published
2003

5. Nuclear stopping at SIS energies by using isospin asymmetric nuclear collisions

Author

Andronic, A., Reisdorf, W., Herrmann, N., Crochet, P., Alard, J-P., Barret, V., Basrak, Z., Bastid, N., Berek, G., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Koczon, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., De Schauenburg, B., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanovi, I., Zhilinh, A., 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

6. Proton and deuteron rapidity distributions and nuclear stopping in 96-Ru(96-Zr)+96-Ru(96-Zr) collisions at 400A MeV

Author

Hong, B., Kim, Y.J., Kang, D.H., Leifels, Y., Rami, F., Schauenburg, B. de, Sim, K.S., Alard, J.P., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Berek, G., Čaplar, Roman, Crochet, P., Devismes, A., Dupieux, P., Dželalija, Mile, Finck, C., Fodor, Z., Gobbi, A., Grishkin, Yu., Hartmann, O.N. Herrmann, Hildenbrand, K.D., Kecskemeti, J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lopez, X., Neubert, W., Pelte, D., Petrovici, M., Reisdorf, W., Schuell, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczy ska, K., Smolyankin, V., Stockmeier, M.R., Stoicea, G., Wagner, P., Winiewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Theory, collisions, Nuclear Experiment
Abstract

We present the centrality dependence of proton and deuteron rapidity distributions in Ru+Ru collisions at 400A MeV. Data are compared with isospin quantum molecular dynamics (IQMD) calculations under various assumptions on the nucleon-nucleon cross section in the medium. The rapidity spectra of both particles can be reproduced by IQMD with a free nucleon-nucleon cross section for the most central collisions. The ratio of baryon rapidity distributions in isospin asymmetric collision systems shows incomplete mixing and partial transparency of the projectile and target nuclei at this beam energy.

Published
2002

7. Proton and deuteron rapidity distributions and nuclear stopping in $^{96}RU(^{96}Zr)+^{96}RU(^{96}Zr)$ collisions at 400A Mev

Author

Hong, B., Kim, Y.J., Kang, D., Leifels, Y., Rami, F., De Schauenburg, B., Sim, K.S., Alard, J-P., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Delalija, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Kecskemeti, J., Kirejczyk, M., Koczon, P., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lopez, X., Neubert, W., Pelte, D., Petrovici, M., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Stoicea, G., Wagner, P., Winiewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., 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), 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), and FOPI

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

8. Direct comparison of phase-space distributions of K- and K+ mesons in heavy-ion collisions at SIS energies - evidence for in-medium modifications of kaons ?

Author

Wisniewski, K., Crochet, P., Herrmann, N., Andronic, A., Averbeck, R., Devismes, A., Finck, C., Gobbi, A., Hartmann, O., Hildenbrand, K.D., Koczon, P., Kress, T., Kutsche, R., Leifels, Y., Reisdorf, W., Schull, D., Alard, J-P., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Grishkin, Y., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, M., Kotte, R., Kowalczyk, M., Lebedev, A., Lee, K.S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., de Schauenburg, B., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., 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, Meson, 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, 7. Clean energy, Nuclear physics, Phase space, 0103 physical sciences, Incident beam, Yield ratio, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The ratio of K- to K+ meson yields has been measured in the systems RuRu at 1.69 A GeV, Ru+Zr at 1.69 A GeV, and Ni+Ni at 1.93 A GeV incident beam kinetic energy. The yield ratio is observed to vary across the measured phase space. Relativistic transport-model calculations indicate that the data are best understood if in-medium modifications of the kaons are taken into account., 14 pages including 3 figures

Published
2001

9. Transition from in-plane to out-of-plane azimuthal enhancement in Au plus Au collisions

Author

Andronic, A., Stoicea, G., Petrovici, M., Simion, V., Crochet, P., Alard, J.P., Averbeck, R., Barret, V., Basrak, Zoran, Bastid, N., Bendarag, A., Berek, G., Čaplar, Roman, Devismes, A., Dupieux, P., Dželalija, Mile, Eskef, M., Finck, Ch., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija Milorad, Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lee K.S., Leifels, Y., Manko, V., Merlitz, H., Neubert, W., Pelte, D., Plettner, C., Rami, F., Reisdorf, W., de Schauenburg, B., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Experiment, nuclear reactions, E=90-400A MeV, semicentral collisions, flow angle, azimuthal distributions, transition energy, quantum molecular dynamics model, nuclear matter equation of state
Abstract

The incident energy at which the azimuthal distributions in semicentral heavy-ion collisions change from in-plane to out-of-plane enhancement ^-E_tran is studied as a function of mass of emitted particles, their transverse momentum and centrality for Au+Au collisions. The analysis is performed in a reference frame rotated with the sidewards flow angle (Theta_flow) relative to the beam axis. A systematic decrease of Etran as function of mass of the reaction products, their transverse momentum and collision centrality is evidenced. The predictions of a microscopic transport model (IQMD) are compared with the experimental results.

Published
2001

10. Transition from in-plane to out-of-plane azimuthal enhancement in Au+Au collisions

Author

Andronic, A., Stoicea, G., Petrovici, M., Simion, V., Alard, J. P., Averbeck, R., Basrak, Z., Bastid, N., Belyaev, I., Berek, G., Best, D., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Herrmann, N., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Leifels, Y., Merlitz, H., Mohren, S., Neubert, W., Pelte, D., Pinkenburg, C., Plettner, C., Rami, F., Reisdorf, W., Ritman, J., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Siwek-Wilczynska, K., Stockmeier, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
E=90-400 AMeV, semi-central collisions, flow angle, azimuthal distributions, nuclear matter Eqation of State, comparison to quantum molecular Dynamics model, Nuclear reactions, transition energy, Nuclear Experiment
Abstract

The incident energy at which the azimuthal distributions in semi-central heavy ion collisions change from in-plane to out-of-plane enhancement is studied as a function of mass of emitted particles, their transverse momentum and centrality for Au+au collisions. The analysis is performed in a reference frame rotated with the sideward flow angle relative to the beam axis.

Published
2001

11. Transition from in-plane to out-of-plane azimuthal enhancement in Au + Au collisions

Author

Andronic, A., Stoicea, G., Petrovici, M., Simion, V., Crochet, P., Alard, J-P., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Bendarag, A., Berek, G., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Neubert, W., Pelte, D., Plettner, C., Rami, F., Reisdorf, W., de Schauenburg, B., Schuell, D., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Vasiliev, M.A., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2001

12. Results from FOPI on strangeness in nuclear matter at SIS energies

Author

Crochet, P., Alard, J.P., Andronic, A., Averbeck, R., Barret, V., Basrak, Zoran, Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Čaplar, Roman, Cindro, Nikola, Devismes, A., Dupieux, P., Dželalija, Mile, Eskef, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., de Schauenburg, B., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang J.T., Yushmanov, I., Zhilin, A., 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
Nuclear Theory, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, charged kaon
Abstract

Experimental data on charged kaon phase space distributions and strangeness sidewards flow measured with the FOPI detector at SIS/GSI are presented. Comparisons are made with the predictions of transport models investigating the in-medium kaon-nucleon potential.

Published
2000

13. Subthreshold $\phi$(1020) meson production in central heavy-ion collisions

Author

Kotte, R., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Crochet, P., Devismes, A., de Schauenburg, B., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Gobbi, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Koczon, P., Kirejczyk, M., Korolija, M., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mosner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Rami, F., Reisdorf, W., Ritman, J., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stockmeier, M.R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., 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), Buballa M. Noerenberg W. Schaefer B.J. Wambach J., and FOPI

Subjects
Information sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Origins of french Information sciences

Published
2000

14. Results from FOPI on strangeness production and propagation in hot and dense nuclear matter

Author

Devismes, A., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Crochet, P., de Schauenburg, B., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Gobbi, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Koczon, P., Kirejczyk, M., Korolija, M., Kotte, R., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mosner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Rami, F., Reisdorf, W., Ritman, J., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stockmeier, M.R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., 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), Buballa M. Noerenberg W. Schaefer B.J. Wambach J., and FOPI

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2000

15. Direct comparison of phase-space distribution of K- and K+ mesons in heavy-ion collisions at SIS energies - evidence for in-medium modifications of kaons?

Author

Wisniewski, K., Crochet, P., Herrmann, N., Andronic, A., Averbeck, R., Devismes, A., Finck, C., Gobbi, A., Hartmann, O., Hildenbrand, K.D., Koczon, P., Kress, T., Kutsche, R., Leifels, Y., Reisdorf, W., Schull, D., Alard, J.P., Barret, V., Basrak, Zoran, Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Čaplar, Roman, Cindro, Nikola, Dupieux, P., Dželalija, Mile, Eskef, M., Fodor, Z., Grishkin, Y., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, Milorad, Kotte, R., Kowalczyk, M., Lebedev, A., Lee, K.S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., de Schauenburg, B., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wohlfarth, D., Yang, J.T., Yushmanov, I., and Zhilin, A.

Subjects
heavy-ions, A=100 and A=200 mass region, 2 AGeV, K- to K+-meson, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The ratio of K- to K+-meson yields has been measured in the systems Ru-96 + Ru-96 at 1.69 A GeV, Ru-96 + Zr-96 at 1.69 A GeV, and Ni-58 + Ni-58 at 1.93 A GeV incident beam kinetic energy. The yield ratio is observed to vary across the measured phase space. Relativistic transport-model calculations indicate that the data are best understood if in-medium modifications of the kaons are taken into account.

Published
2000

16. Sideward flow of K+ mesons in Ru + Ru and Ni + Ni reactions near threshold

Author

Crochet, P, Herrmann, N., Wisniewski, K., Leifels, Y., Andronic, A., Averbeck, R., Devismes, A., Finck, C., Gobbi, A., Hartmann, O., Hildenbrand, K.D., Koczon, P., Kress, T., Kutsche, R., Reisdorf, W., Schuell, D., Alard, J.P., Barret, V., Basrak, Zoran, Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Čaplar, Roman, Cindro, Nikola, Dupieux, P., Dželalija, Mile, Eskef, M., Fodor, Z., Grishkin, Y., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, Milorad, Kotte, R., Kowalczyk, M., Lebedev, A., Lee, K.S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., de Schauenburg, B., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wohlfarth, D., Yang, J.T., Yushmanov, I., and Zhilin, A.

Subjects
flow, reactions, K meson, heavy ions, nuclear physics, intermediate energies, strangeness production, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Experimental data on K+ meson and proton sideward flow measured with the FOPI detector at SIS/GSI in the reactions Ru + Ru at 1.69A GeV and Ni + Ni at 1.93A GeV are presented. The K+ sideward flow is found to be anti-correlated (correlated) with the one of protons at low (high) transverse momenta. When compared to the predictions of a transport model, the data favour the existance of an in-medium repulsive K+ -nucleon potential.

Published
2000

17. Sideward flow of $K^{+}$ in Ru+Ru and Ni+Ni reactions at SIS energies

Author

Crochet, Philippe, Herrmann, N, Wisniewski, K, Leifels, Y, Averbeck, R, Devismes, A, Finck, C, Gobbi, A, Hildenbrand, K D, Kress, T, Kutsche, R, Reisdorf, W, Schüll, D, Alard, J P, Andronic, A, Barret, V, Basrak, Z, Bastid, N, Belyaev, I, Bendarag, A, Berek, G, Caplar, R, Cindro, N, Dupieux, P, Czelalija, M, Eskef, M, Fodor, Z, Grishkin, Yu L, Hong, B H, Kecskeméti, J, kim, Y J, Kirejczyk, M, Korolija, M, Kotte, R, Kowalczyk, M, Lebedev, A, Lee, K S, Man'ko, V I, Merlitz, H, Mohren, S, Moisa, D, Neubert, W, Nyanin, A, Pelte, D, Petrovici, M, Plettner, C, Rami, F, De Schauenburg, B, Seres, Z, Sikora, B, Sim, K S, Simion, V, Siwek-Wilczynska, K, Smolyankin, V T, Somov, A, Stockmeier, M R, Stoicea, G, Vasilev, M, Wagner, P, Wohlfarth, D, Yang, J T, Yushmanov, I E, and Zhilin, A V

Subjects
Nuclear Physics
Published
2000

18. Isospin tracing : a probe of nonequilibrium in central heavy-ion collisions

Author

Rami, F. Leifels, Y., de Schauenburg, B., Gobbi, A., Hong, B., Alard, J.P., Andronic, A., Averbeck, R., Barret, V., Basrak, Zoran, Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Čaplar, Roman, Cindro, Nikola, Crochet, P., Devismes, A., Dupieux, P., Dželalija, Mile, Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K. D., Kecskemeti, J., Kim, Y.J., Koczon, P., Kirejczyk, M., Korolija, Milorad, Kotte, R., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mösner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Ritman, J., Schüll, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyska, K., Somov, A., Stockmeier, M.R., Stoicea, G., Vasiliev, M., Wagner, P., Winiewski, K., Wohlfarth, D., Yang, J.T., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Theory, nuclear physics, heavy ions, intermediate energies, nonequilibrium, Nuclear Experiment
Abstract

Four different combinations of Ru and Zr nuclei, both as projectile and target, were investigated at the same bombarding energy of 400A MeV using a 4 detector. The degree of isospin mixing between projectile and target nucleons is mapped across a large portion of the phase space using two different isospin-tracer observables, the number of measured protons and the tritium to 3He yield ratio. The experimental results show that the global equilibrium is not reached even in the most central collisions. Quantitative measures of stopping and mixing are extracted from the data. They are found to exhibit a quite strong sensitivity to the in-medium (n,n) cross section used in microscopic transport calculations.

Published
2000

19. Isospin-tracing:A probe of non-equilibrium in central heavy-ion collisions

Author

Rami, F., Leifels, Y., Schauenburg, B., Gobbi, A., Hong, B., Alard, J. P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K. D., Kecskemeti, J., Kim, Y. J., Koczon, P., Kirejczyk, M., Korolija, M., Kotte, R., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K. S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mösner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Ritman, J., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stockmeier, M. R., Stoicea, G., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J. T., Yushmanow, I., and Zhilin, A.

Subjects
25.75.Ld, 25.75.Dw, Nuclear Theory, Nuclear Experiment, 25.75.-q [PACS numbers]
Abstract

Four different combinations of 9644Ru and 9640Zr nuclei, both as projectile and target, were investigated at the same bombarding energy of 400 AMeV using a 4pi detector. The degree of isospin mixing between projectile and target nucleons is mapped across a large portion of the phase space using two different isospin-tracer observables, the number of measured protons and the t/3He yield ratio. The experimental results show that the global equilibrium is not reached even in the most central collisions. Quantitative measures of stopping and mixing are extracted from the data. They are found to exhibit a quite strong sensitivity to the in-medium (n,n) cross section used in microscopic transport calculations.

Published
2000

20. Elliptic flow and equation of state in heavy ion collisions at SIS energies

Author

Andronic, A., Rami, F., Crochet, P., Dona, R., De Schauenburg, B., Wagner, P., Alard, J-P., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Stoicea, G., Stockmeir, M., Vasilev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., 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), 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), and FOPI

Subjects
school library, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], librarian secondary education, social navigation, research method
Published
1999

21. On the Space-Time Difference of Proton and Composite Particle Emission in Central Heavy-Ion Reactions at 400 AMeV

Author

Kotte, R., Barz, H. W., Neubert, W., Plettner, C., Wohlfarth, D., Alard, J. P., Andronic, A., Averbeck, R., Basrak, Z., Bastid, N., Bendarag, N., Berek, G., Caplar, R., Cindro, N., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Grishkin, Y., Herrmann, N., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Korolija, M., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K. S., Leifels, Y., Manko, V., Merlitz, H., Moisa, D., Nianine, A., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stoicea, G., Vasiliev, M. A., Wagner, P., Wisniewski, K., Yang, J. T., Yushmanov, Y., and Zhilin, A.

Subjects
Multifragmentation, Fragment-fragment correlation, Nuclear physics, Final-state interaction, Radial flow, Intermediate energy heavy-ion reactions
Abstract

Small-angle correlations of pairs of nonidentical light charged particles produced in central collisions of heavy ions in the A=100 mass region at a beam energy of 400 AMeV are investigated with the FOPI detector system at GSI Darmstadt. The difference of longitudinal correlation functions with the relative velocity parallel and anti-parallel to the center-of-mass velocity of the pair in the central source frame is studied. This method allows extracting the apparent space-time differences of the emission of the charged particles. Comparing the correlations with results of a final-state interaction model delivers quantitative estimates of these asymmetries. Time delays as short as 1 fm/c or - alternatively - source radius differences of a few tenth fm are resolved. The strong collective expansion of the participant zone introduces not only an apparent reduction of the source radius but also a modification of the emission times. After correcting for both effects a complete sequence of space-time emission points of p, d, t, 3He, alpha particles is presented for the first time.

Published
1999

22. Strangeness and in-medium effects in heavy ion collisions from 1 to 2 AGeV

Author

Crochet, P., Andronic, A., Rami, F., Dona, R., De Schauenburg, B., Wagner, P., Alard, J-P., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Stoicea, G., Stockmeir, M., Vasilev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., 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
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1998

23. Stopping and radial flow in central $^{58}$Ni + $^{58}$Ni collisions between 1A and 2A GeV

Author

Hong, B., Herrmann, N., Ritman, J.L., Best, D., Gobbi, A., Hildenbrand, K.D., Kirejczyk, M., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schull, D., Sodan, U., Wang, G.S., Wienold, T., Alard, J-P., Amouroux, V., Bastid, N., Belyaev, I., Berek, G., Biegansky, J., Buta, A., Coffin, J.P., Crochet, P., Dona, R., Dupieux, P., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Hafele, E., Jundt, F., Kecskemeti, J., Korolija, M., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mosner, J., Mohren, S., Neubert, W., Pelte, D., Petrovici, M., Pras, P., Rami, F., Roy, C., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Somov, A., Tizniti, L., Trzaska, M., Vasilev, M.A., Wagner, P., Wohlfarth, D., Zhilin, A., 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), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), FOPI, and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
nucleus-nucleus collisions, heavy-ion collisions, subthreshold kaon production, Baryon distributions, Au+au collisions, matter equation, pion-production, state, expansion, probe, Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The production of charged pions, protons. and deuterons has been studied in central collisions of Ni-58 on Ni-58 at incident beam energies of 1.06A, 1.45A, and 1.93A GeV. The dependence of transverse-momentum and rapidity spectra on the beam energy and on the centrality of the collison is presented. It is shown that the scaling of the mean rapidity shift of protons established for between 10A and 200A GeV at the Brookhaven AGS and the CERN SPS accelerators energies is valid down to 1A GeV. The degree of nuclear stopping is discussed ; quantum molecular dynamics calculations reproduce the measured proton rapidity spectra for the most central events reasonably well, but do not show any sensitivity between the soft and the hard equation of state. A radial Bow analysis, using the midrapidity transverse-momentum spectra, delivers freeze-out temperatures T and radial flow velocities beta(r) which increase with beam energy up to 2A GeV ; in comparison to the existing data of Au on Au over a large range of energies, only beta(r) shows a system size dependence.

Published
1998

24. Azimuthal anisotropies as stringent test for nuclear transport models

Author

Crochet, P., Rami, F., Dona, R., Coffin, J.P., Fintz, P., Guillaume, G., Jundt, F., Kuhn, C., Roy, C., de Schauenburg, B., Tizniti, L., Wagner, P., Alard, J.P., Andronic, A., Basrak, Zoran, Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Biegensky, J., Buta, A., Čaplar, Roman, Cindro, Nikola, Dupieux, Dželalija, Mile, Fan, Z.G., Fodor, Z., Fraysse, Freifelder, R.P., Gobbi, A., Hermann, N., Hildenbrand, K.D., Hong, B., Jeong, S.C., Kecskemeti, Kirejczyk, M., Koncz, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Manko, V., Moisa, D., Mösner, J., Neubert, W., Pelte, D., Petrovici, M., Pikenburg, C., Reisdorf, W., Ritman, J.L., Sadchikov, A.G., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Sodan, U., Teh, K.M., Trzaska, M., Wang, J.P., Wessels, J.P., Wienold, T., Wisniewski, K., Wohlfarth, D., Zhilin, A., and Hartnack, C.

Subjects
Nuclear Experiment
Abstract

Azimuthal distributions of charged particles and intermediate mass fragments emitted in Au+Au collisions at 600A MeV have been measured using the FOPI facility at GSI-Darmstadt. Data show a strong increase of the in-plane azimuthal anisotropy ratio with the charge of the detected fragment. Intermediate mass fragments are found to exhibit a strong momentum-space alignment with respect of the reaction plane. The experimental results are presented as a function of the polar centre-of-mass angle and over a broad range of impact parameters. They are compared to the predictions of the Isospin Quantum Molecular Dynamics model using three different parametrisations of the equation of state. We show that such highly accurate data provide stringent test for microscopic transport models and can potentially constrain separately the stiffness of the nuclear equation of state and the momentum dependence of the nuclear interaction.

Published
1997

25. Azimuthal anisotropies as stringent test for nuclear transport models

Author

Crochet, P., Rami, F., Dona, R., Coffin, J. P., Fintz, P., Guillaume, G., Jundt, F., Kuhn, C., Roy, C., Schauenburg, B., Tizniti, L., Wagner, P., Alard, J. P., Andronic, A., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Biegansky, J., Buta, A., Caplar, R., Cindro, N., Dupieux, P., Dzelalija, M., Fan, Z. G., Fodor, Z., Fraysse, L., Freifelder, R. P., Gobbi, A., Herrmann, N., Hildenbrand, K. D., Hong, B., Jeong, S. C., Kecskemeti, J., Kirejczyk, M., Koncz, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Manko, V., Moisa, D., Mösner, J., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Reisdorf, W., Ritman, J. L., Sadchikov, A. G., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Sodan, U., Teh, K. M., Trzaska, M., Wang, G. S., Wessels, J. P., Wienold, T., Wisniewski, K., Wohlfarth, D., and Zhilin, A.

Published
1997

26. Proton-proton correlations in central collisions of Ni + Ni at 1.93 A.GeV and the space-time extent of the emission source

Author

Kotte, R., Biegansky, J., Mösner, J., Neubert, W., Plettner, C., Wohlfarth, D., Alard, J. P., Amouroux, V., Basrak, Z., Bastid, N., Belyaev, I., Berek, G., Best, D., Buta, A., Caplar, R., Cindro, N., Coffin, J. P., Crochet, P., Dona, R., Dupieux, P., Dzelalija, M., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Göbels, G., Gobbi, A., Guillaume, G., Häfele, E., Herrmann, N., Hildenbrand, K. D., Hölbling, S., Hong, B., Jundt, F., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kuhn, C., Lebedev, A., Legrand, I., Leifels, Y., Maazouzi, C., Manko, V., Merlitz, H., Mohren, S., Pelte, D., Petrovici, M., Pinkenburg, C., Pras, P., Rami, F., Reisdorf, W., Ritman, J. L., Roy, C., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Sodan, U., Somov, A., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., Wang, G. S., Wienold, T., Yatsunenko, Y., Zhilin, A., 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
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

Small-angle correlations of proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 A · GeV are investigated with the FOPI detector system at GSI Darmstadt. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the source extension. The determination of the source rest frame is found essential for the identification of this effect. For the present system, the selection of central events comprising about 8% of the total cross section allows for the isolation of a compact source in momentum space which is centered around the c.m. velocity of the colliding nuclei. Taking into account the strong collective expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30%, r.m.s. radius and emission time parameters of Rrms=(4.2±1.2) fm and trms=(11+7-5) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function mixes the spatial and temporal size of the source and gives an upper limit Rrms=(7.0 ± 0.8) fm of the source radius.

Published
1997

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