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193 results on '"Schüll D"'

2. Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV

Author

FOPI Collaboration, Hong, B., Herrmann, N., Ritman, J. L., Best, D., Gobbi, A., Hildenbrand, K. D., Kirejczyk, M., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schuell, 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., Haefele, E., Jundt, F., Kecskemeti, J., Korolija, M., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Moesner, 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., Vasiliev, M. A., Wagner, P., Wohlfarth, D., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

Charged pion spectra measured in 58Ni-58Ni collisions at 1.06, 1.45 and 1.93 AGeV are interpreted in terms of a thermal model including the decay of Delta resonances. The transverse momentum spectra of pions are well reproduced by adding the pions originating from the Delta-resonance decay to the component of thermal pions, deduced from the high transverse momentum part of the pion spectra. About 10 and 18% of the nucleons are excited to Delta states at freeze-out for beam energies of 1 and 2 AGeV, respectively., Comment: 14 pages, LaTeX with 3 included figures; submitted to Physics Letters B

Published
1997
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4. 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

Wiśniewski, 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., Schüll, D., Alard, J.P., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Čaplar, R., Cindro, N., Dupieux, P., Dželalija, 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-Wilczyńska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., and The FOPI Collaboration

Published
2000
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5. On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

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., Čaplar, R., Cindro, N., Crochet, P., Devismes, A., Dupieux, P., Dželalija, 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., de Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Somov, A., Stoicea, G., Vasiliev, M.A., Wagner, P., Wiśniewski, K., Yang, J.T., Yushmanov, Y., Zhilin, A., and The FOPI Collaboration

Published
1999
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6. Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV: FOPI Collaboration

Author

Eskef, M., Pelte, D., Goebels, G., Häfele, E., Herrmann, N., Korolija, M., Leifels, Y., Merlitz, H., Mohren, S., Stockmeier, M.R., Trzaska, M., Alard, J.P., Andronic, A., Averbeck, R., Basrak, Z., Bastid, N., Belyaev, I., Best, D., Buta, A., Čaplar, R., Cindro, N., Coffin, J.P., Crochet, P., Dupieux, P., Dželalija, M., Fraysse, L., Fodor, Z., Genoux-Lubain, A., Gobbi, A., Hildenbrand, K.D., Hong, B., Jundt, F., Kecskemeti, J., Kirejczyk, M., Kotte, R., Kutsche, R., Lebedev, A., Manko, V., Mösner, J., Moisa, D., Neubert, W., Petrovici, M., Pinkenburg, C., Plettner, C., Pras, P., Rami, F., Ramillien, V., Reisdorf, W., Ritman, J.L., de Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Vasiliev, M.A., Wagner, P., Wang, G.S., Wisniewski, K., Wohlfarth, D., and Zhilin, A.

Published
1998
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7. Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration

Author

Pelte, D., Häfele, E., Best, D., Goebels, G., Herrmann, N., Pinkenburg, C., Reisdorf, W., Trzaska, M., Alard, J. P., Amouroux, V., Andronic, A., Basrak, Z., Bastid, N., Belyaev, I., Biegansky, J., Buta, A., Čaplar, R., Cindro, N., Coffin, J. P., Crochet, P., Dupieux, P., Dżelalija, M., Erö, J., Eskef, M., Fintz, P., Fodor, Z., Genoux-Lubain, A., Gobbi, A., Guillaume, G., Hildenbrand, K. D., Hong, B., Jundt, F., Kecskemeti, J., Kirejczyk, M., Koncz, P., Korolija, M., Korchagin, Y., Kotte, R., Kuhn, C., Lambrecht, D., Lebedev, A., Legrand, I., Leifels, Y., Manko, V., Merlitz, H., Mösner, J., Mohren, S., Moisa, D., Neubert, W., Petrovici, M., Pras, P., Rami, F., Ramillien, V., Ritman, J. L., Roy, C., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Sodan, U., Vasiliev, M. A., Wagner, P., Wang, G. S., Wienold, T., Wohlfarth, D., and Zhilin, A.

Published
1997
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8. Shape of collective flow in highly central Au(150 A MeV)+Au collisions

Author

Roy, C., Kuhn, C., Coffin, J. P., Crochet, P., Fintz, P., Guillaume, G., Jundt, F., Maazouzi, C., Rami, F., Tizniti, L., Wagner, P., Alard, J. P., Amouroux, V., Basrak, Z., Bastid, N., Belyaev, I., Best, D., Biegansky, J., Buta, A., Čaplar, R., Cindro, N., Donà, R., Dupieux, P., Dzelalija, M., Fan, Z. G., Fodor, Z., Fraysse, L., Gobbi, A., Herrmann, N., Hildenbrand, K. D., Hölbling, S., Hong, B., Jeong, S. C., Kecskemeti, J., Kirejczyk, M., Koncz, P., Korchagin, Y., Kotte, R., Lebedev, A., Legrand, I., Leifels, Y., Manko, V., Mgebrishvili, G., Moisa, D., Mösner, J., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Pras, P., Reisdorf, W., Ritman, J. L., Sadchikov, A. G., Schüll, D., Seres, Z., Sikora, B., Simion, V., Smolyankin, V., Sodan, U., Trzaska, M., Vasiliev, M., Wang, G. S., Wessels, J. P., Wienold, T., Wohlfarth, D., Zhilin, A., Konopka, J., and Stöcker, H.

Published
1997
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10. On the transverse momentum distribution of strange hadrons produced in relativistic heavy ion collisions

Author

Ritman, J. L., Herrmann, N., Best, D., Alard, J. P., Amouroux, V., Bastid, N., Belyaev, I., Berger, L., Biegansky, J., Buta, A., Čaplar, R., Cindro, N., Coffin, J. P., Crochet, P., Dona, R., Dupieux, P., Dzelalija, M., Fintz, P., Fodor, Z., Genoux-Lubain, A., Gobbi, A., Goebels, G., Guillaume, G., Grigorian, Y., Häfele, E., Hildenbrand, K. D., Hölbling, S., Jundt, F., Kecskemeti, J., Kirejczyk, M., Korchagin, Y., Kotte, R., Kuhn, C., Lambrecht, D., Lebedev, A., Legrand, I., Leifels, Y., Maazouzi, C., Manko, V., Matulewicz, T., Mösner, J., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Rami, F., Ramillien, V., Reisdorf, W., Roy, C., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Sodan, U., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., Wang, G. S., Wienold, T., Wohlfarth, D., Zhilin, A., and The FOPI Collaboration

Published
1995
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11. Flow angle from intermediate mass fragment measurements

Author

Rami, F., Crochet, P., Donà, R., de Schauenburg, B., Wagner, P., Alard, J.P., Andronic, A., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Čaplar, R., Devismes, A., Dupieux, P., Dželalija, 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., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczyńska, K., Stoicea, G., Stockmeir, M., Vasiliev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Published
1999
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12. Correlation between transfer and fusion in heavy ion reactions at the Coulomb barrier

Author

Bellwied, R., Kratz, J. V., Reisdorf, W., Schüll, D., Kohlmeyer, B., Künkel, R., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Ruelle, D., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Signorini, C., editor, Skorka, S., editor, Spolaore, P., editor, and Vitturi, A., editor

Published
1988
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13. The GSI magnetic spectrometer

Author

Schüll, D., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, and von Oertzen, W., editor

Published
1983
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17. Azimuthal Dependence of Collective Expansion for Symmetric Heavy-Ion Collisions

Author

Stoicea, G., Petrovici, M., Andronic, A., Herrmann, N., Alard, J.P., Basrak, Zoran, Barret, V., Bastid, N., Čaplar, Roman, Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Rami, F., Reisdorf, W., Schüll, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stockmeier, M., Wiśniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Heavy-ion collisions, collective expansion, Nuclear Experiment
Abstract

Detailed studies of the azimuthal dependence of the mean fragment and flow energies in the Au + Au and Xe + CsI systems are reported as a function of incident energy and centrality. Comparisons between data and model calculations show that the flow energy values along different azimuthal directions could be viewed as snapshots of the fireball expansion with different exposure times. For the same number of participating nucleons more transversally elongated participant shapes from the heavier system produce less collective transverse energy. Good agreement with Boltzmann-Uehling-Uhlenbeck calculations is obtained for a soft nuclear equation of state

Published
2004

19. 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

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

Author

Hong, B., Kim, Y. J., Kang, D. H., Leifels, Y., Rami, F., 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., Dzelalija, 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., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M. R., Stoicea, G., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Theory, 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 calculations (IQMD) 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 both the projectile and target nuclei at this beam energy.

Published
2002

21. 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

22. 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

23. 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

24. 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

25. Flow Angle from Intermediate Mass Fragments

Author

Rami, F., Crochet, P., Dona, R., Schauenburg, B., Wagner, P., Alard, J. P., Andronic, A., 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., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Stoicea, G., Stockmeier, M., Vasiliev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

Directed sideward flow of light charged particles and intermediate mass fragments was measured in different symmetric reactions at bombarding energies from 90 to 800 AMeV. The flow parameter is found to increase with the charge of the detected fragment up to Z=3-4 and turns into saturation for heavier fragments. Guided by simple simulations of an anisotropic expanding thermal source, we show that the value at saturation can provide a good estimate of the flow angle, Θflow, in the participant region. It is found that Θflow, depends strongly on the impact parameter. The excitation function of Θflow, reveals striking deviations from the ideal hydrodynamical scaling. The data exhibit a steep rise of Θflow, to a maximum at around 250-400 AMeV, followed by a moderate decrease as the bombarding energy increases further.

Published
1999

26. 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

27. Proton-Proton Correlations in Central Collisions of Ni+Ni at 1.93 A GeV and the Space-Time Extent of the Emission Source

Author

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

Abstract

Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive 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 gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.

Published
2010

28. Velocity correlations of intermediate mass fragments produced in central collisions of Au + Au at E = 150 A MeV

Author

Kämpfer, Burkhard, Grigorian, Y., Herrmann, N., Fraysse, L., Fintz, P., Fodor, Z., Blaich, Th., Bastid, N., Frolov, S., Basrak, Z., Freifelder, R., Guillaume, G., Gobbi, A., Cerruti, C., Hildenbrand, K. D., Jorio, M., Reisdorf, W., Alard, J. P., Wohlfarth, Dietrich, Krämer, M., Mösner, Jürgen, Legrand, I., Kotte, Roland, Koncz, P., Petrovici, M., Vasiliev, M. A., Belayev, I. M., Teh, K., Sodan, U., Smolyankin, S., Simion, V., Sikora, B., Seres, Z., Schüll, D., Wessels, J. P., Rami, F., Wagner, P., Morel, P., Montbel, I., Montaru, G., Moisa, D., Mgebrishvili, G., Matulewicz, T., Manko, V., Maguire, C., Lebedev, A., Kuhn, C., Sadchikov, A., Coffin, J. P., Hölbling, S., Houari, A., Jeong, S. C., Fan, Z. G., Jundt, F., Kecskemeti, J., Buta, A., Trzaska, M., Cindro, N., Wienold, T., Dupieux, P., Pelte, D., Wilhelmi, Z., Korchagin, Y., Tezkratt, R., Zhilin, A. L., Neubert, Waldemar, Erö, J., Caplar, R., Kämpfer, Burkhard, Grigorian, Y., Herrmann, N., Fraysse, L., Fintz, P., Fodor, Z., Blaich, Th., Bastid, N., Frolov, S., Basrak, Z., Freifelder, R., Guillaume, G., Gobbi, A., Cerruti, C., Hildenbrand, K. D., Jorio, M., Reisdorf, W., Alard, J. P., Wohlfarth, Dietrich, Krämer, M., Mösner, Jürgen, Legrand, I., Kotte, Roland, Koncz, P., Petrovici, M., Vasiliev, M. A., Belayev, I. M., Teh, K., Sodan, U., Smolyankin, S., Simion, V., Sikora, B., Seres, Z., Schüll, D., Wessels, J. P., Rami, F., Wagner, P., Morel, P., Montbel, I., Montaru, G., Moisa, D., Mgebrishvili, G., Matulewicz, T., Manko, V., Maguire, C., Lebedev, A., Kuhn, C., Sadchikov, A., Coffin, J. P., Hölbling, S., Houari, A., Jeong, S. C., Fan, Z. G., Jundt, F., Kecskemeti, J., Buta, A., Trzaska, M., Cindro, N., Wienold, T., Dupieux, P., Pelte, D., Wilhelmi, Z., Korchagin, Y., Tezkratt, R., Zhilin, A. L., Neubert, Waldemar, Erö, J., and Caplar, R.

Published
2010

29. Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV

Author

Eskef, M., Pelte, D., Goebels, G., Häfele, E., Herrmann, N., Korolija, Milorad, Leifels, Y., Merlitz, H., Mohren, S., Stockmeier, M.R., Trzaska, M., Alard, J.P., Andronic, A., Averbeck, R., Basrak, Zoran, Bastid, N., Belyaev, I., Best, D., Buta, A., Čaplar, Roman, Cindro, Nikola, Coffin, J.P., Crochet, P., Dupieux, P., Dželalija, Mile, Fraysse, L., Fodor, Z., Genoux Lubain, A., Gobbi, A., Hildenbrand, K.D., Hong, B., Jundt, F., Keckemeti, J., Kirejczyk, M., Kotte, R., Kutsche, R., Lebedev, A., Manko, V., Mösner, J., Moisa, D., Neubert, W., Petrovici, M., Pinkenburg, C., Plettner, C., Pras, P., Rami, F., Ramillien, V., Reisdorf, W., Ritman, J.L., de Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wuilczynska, K., Smolyankin, V., Vasiliev, M.A., Wagner, P., Wang, G.S., Wisniewski, K., Wohlfarth, D., and Zhilin, A.

Subjects
central collisions, baryon resonances, heavy-ion, temperature, Nuclear Experiment
Abstract

The mass distributions of baryon resonances populated in near-central collisions of Au on Au and Ni on Ni are deduced by defolding the p (t) spectra of charged pions by a method which does not depend on a specific resonance shape. In addition the mass distributions of resonances are obtained from the invariant masses of (p. pi(+/-)) pairs. With both methods the deduced mass distributions are shifted by an average value of -60 MeV/c(2) relative to the mass distribution of the free Delta(1232)resonance, the distributions descent almost exponentially towards mass values of 2000 MeV/c(2). The observed differences between (p, pi(-)) and (p, pi(+)) pairs indicate a contribution of isospin I = 1/2 resonances. The attempt to consistently describe the deduced mass distributions and the reconstructed kinetic energy spectra of the resonances leads to new insights about the freeze out conditions, i.e. to rather low temperatures and large expansion velocities.

Published
1998

30. Proton-Proton Correlations in Central Collisions of Ni+Ni at 1.93 A GeV and the Space-Time Extent of the Emission Source

Author

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

Abstract

Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive 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 gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.

Published
1997

31. Onset of nuclear matter expansion in Au+Au collisions

Author

Crochet, P., Rami, F., Gobbi, A., Dona, R., Coffin, J.P., Fintz, P., Guillaume, G., Jundt, F., Kuhn, C., Roy, C., Deschauenburg, B., Tizniti, L., Wagner, P., Alard, J.P., Amouroux, V., Andronic, A., Basrak, Zoran, Bastid, N., Belyaev, I., Best, D., Biegansky, J., Buta, A., Čaplar, Roman, Cindro, Nikola, Dupieux, P., Dželalija, Mile, Fan, Z.G., Fodor, Z., Fraysse, Freifelder, R.P., Herrmann, N, Hildenbrand, K.D., Hong, B., Jeong, S.C., Kecskemeti, J., 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., Pras, P., Ramillien, V., 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., Vasiliev, M., Wang, J.P., Wessels, J.P., Wienold, T., Wisniewski, K., Wohlfarth, D., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

Using the FOPI detector at GSI Darmstadt, excitation functions of collective flow components were measured for the Au+Au system, in the reaction plane and out of this plane, at seven incident energies ranging from 100AMeV to 800AMeV. The threshold energies, corresponding to the onset of sideward-flow (balance energy) and squeeze-out effect (transition energy), are extracted from extrapolations of these excitation functions toward lower beam energies for charged products with Z greater than or equal to 2. The transition energy is found to be larger than the balance energy. The impact parameter dependence of both balance and transition energies, when extrapolated to central collisions, suggests comparable although slightly higher values than the threshold energy for the radial flow. The relevant parameter seems to be the energy deposited into the system in order to overcome the attractive nuclear forces.

Published
1997

32. 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

33. Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 A MeV

Author

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

Subjects
NUCLEAR REACTIONS Au (Au,X), deduced in-plane to out-of-plane emission transition signature, E = 100-800 MeV/nucleon, transverse momentum, Nuclear Experiment, measured fragment azimuthal anisotropy vs collision centrality, incident energy, fragment charge
Abstract

We present new experimental results concerning the azimuthal distributions of proton-likes, light and intermediate mass fragments at midrapidity for Au(100-800 A MeV)+Au collisions measured with the FOPI phase-I detector at GSI in Darmstadt. The azimuthal distributions are investigated as a function of the collision centrality, the incident energy, the fragment charge and transverse momentum. The azimuthal anisotropy is maximum for impact parameters around 7 fm. Intermediate mass fragments present a stronger out-of-plane emission signal than light fragments and a saturation is reached for Z 4. The azimuthal anisotropy increases with the fragment transverse momentum and decreases as the incident energy increases. The azimuthal anisotropy of Z = 2 particles investigated as a function of the scaled fragment transverse momentum follows an universal curve for bombarding energies between 250-800 A MeV. A signature for a transition from in-plane to out-of-plane emission is evidenced at the lowest beam energies.

Published
1997

34. 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

35. Interplay of collective flow phenomena and velocity correlations of intermediate-mass fragments in collisions of Au + Au at E = (100-400) A MeV

Author

Kotte, R., Kämpfer, B., Mösner, J., Neubert, W., Wohlfarth, D., Alard, J. P., Amouroux, V., Basrak, Z., Bastid, N., Belayev, I. M., Berger, L., Blaich, T., Boussange, S., Buta, A., Caplar, R., Cerruti, C., Cindro, N., Coffin, J. P., Dona, R., Dupieux, P., Erö, J., Fan, Z. G., Fintz, P., Fodor, Z., Fraysse, L., Freifelder, R., Frolov, S., Gobbi, A., Grigorian, Y., Guillaume, G., Herrmann, N., Hildenbrand, K. D., Hölbling, S., Houari, O., Ibnouzahir, M., Jeong, S. C., Jundt, F., Kecskemeti, J., Koncz, P., Korchagin, Y., Krämer, M., Kuhn, C., Legrand, I., Lebedev, A., Manko, V., Matulewicz, T., Mgebrishvili, G., Moisa, D., Montarou, G., Montbel, I., Pelte, D., Petrovici, M., Pras, P., Rami, F., Ramillien, V., Reisdorf, W., Sadchikov, A., Schüll, D., Seres, Z., Sikora, B., Simion, V., Smolyankin, S., Sodan, U., Teh, K., Tezkratt, R., Trzaska, M., Vasiliev, M. A., Wagner, P., Wessels, J. P., Wienold, T., Wilhelmi, Z., and Zhilin, A. V.

Published
1995

36. Interplay of collective flow phenomena and velocity correlations of intermediate-mass fragments in collisions of Au + Au at E = 100 - 400 A MeV

Author

Kotte, R, Kämpfer, B, Mösner, J, Neubert, W, Wohlfarth, D, Alard, J P, Amouroux, V, Basrak, Z, Bastid, N, Belayev, I M, Berger, L, Blaich, T, Boussange, S, Butà, A, Caplar, R, Cerruti, C, Cindro, N, Coffin, J P, Donà, R, Dupieux, P, Erö, J, Fan, Z G, Fintz, P, Fodor, Z, Fraysse, L, Freifelder, R P, Frolov, S, Gobbi, A, Grigorian, Yu I, Guillaume, G, Herrmann, N, Hildenbrand, K D, Hölbling, S, Houari, O, Ibnouzahir, M, Jeong, S C, Jundt, F, Kecskeméti, J, Koncz, P, Korchagin, Yu V, Krämer, M, Kühn, C E, Legrand, I, Ledenev, A V, Man'ko, V I, Matulewicz, T, Mgebrishvili, G, Moisa, D, Montarou, G, Montbel, I, Pelte, D, Petrovici, M, Pras, P, Rami, F, Ramillien, V, Reisdorf, W, Sadchikov, A G, Schüll, D, Seres, Z, Sikora, B, Simion, V, Smolyankin, S, Sodan, U, Teh, K M, Tezkratt, R, Trzaska, M, Vasilev, M A, Wagner, P, Wessels, J P, Wienold, T, Wilhelmi, Z, and Zhilin, A V

Subjects
Nuclear Physics
Published
1994

38. Study of in-medium effects with the Au + Au FOPI data at 400 A.MeV

Author

Ramillien, V, Dupieux, P, Alard, J P, Amouroux, V, Bastid, N, Berger, L, Boussange, S, Fraysse, L, Ibnouzahir, M, Montarou, G, Montbel, I, Pras, P, Basrak, Z, Belayev, I M, Bini, M, Blaich, T, Butà, A, Caplar, R, Cerruti, C, Cindro, N, Coffin, J P, Donà, R, Erö, J, Fan, Z G, Fintz, P, Fodor, Z, Freifelder, R P, Frolov, S, Gobbi, A, Gregorian, Y, Guillaume, G, Hartnack, C, Herrmann, N, Hildenbrand, K D, Hölbling, S, Houari, O, Jeong, S C, Jundt, F, Kecskeméti, J, Koncz, P, Korchagin, Yu V, Kotte, R, Krämer, M, Kühn, C E, Legrand, I, Lebedev, A, Maguire, C F, Man'ko, V I, Maurenzig, P R, Mgebrishvili, G, Mösner, J, Moisa, D, Neubert, W, Olmi, A, Pasquali, G, Pelte, D, Petrovici, M, Poggi, G, Rami, F, Reisdorf, W, Sadchikov, A G, Schüll, D, Seres, Z, Sikora, B, Simion, V, Smolyankin, S, Sodan, U, Teh, K M, Tezkratt, R, Trzaska, M, Vasilev, M A, Wagner, P, Wessels, J P, Wienold, T, Wilhelmi, Z, Wohlfarth, D, and Zhilin, A V

Subjects
Nuclear Physics
Published
1994

39. Multidimensional analysis of collective sidewards flow in Au on Au reactions between 100 and 1050 A MeV

Author

Wienold, T, Hartnack, C, Fan, Z G, Freifelder, R P, Gobbi, A, Grigorian, Yu I, Herrmann, N, Hildenbrand, K D, Jeong, S C, Krämer, M, Reisdorf, W, Schüll, D, Sodan, U, Teh, K M, Wessels, J P, Pelte, D, Trzaska, M, Alard, J P, Amouroux, V, Basrak, Z, Bastid, N, Belayev, I M, Berger, L, Blaich, T, Boussange, S, Butà, A, Caplar, R, Cerruti, C, Cindro, N, Coffin, J P, Donà, R, Dupieux, P, Erö, J, Fintz, P, Fodor, Z, Fraysse, L, Guillaume, G, Hölbling, S, Houari, O, Joriot, M, Jundt, F, Kecskeméti, J, Koncz, P, Korchagin, Yu V, Kotte, R, Kühn, C E, Ibnouzahir, M, Legrand, I, Lebedev, A, Maguire, C F, Man'ko, V I, Mgebrishvili, G, Mösner, J, Moisa, D, Montarou, G, Montbel, I, Morel, P, Neubert, W, Petrovici, M, Rami, F, Ramillien, V, Sadchikov, A G, Seres, Z, Sikora, B, Simion, V, Smolyankin, S, Tezkratt, R, Vasilev, M A, Wagner, P, Wilhelmi, Z, Wohlfarth, D, and Zhilin, A V

Subjects
Nuclear Physics
Published
1994

40. Velocity correlations of intermediate mass fragments produced in central collisions of Au + Au at E = 150 A MeV

Author

Kämpfer, B., Kotte, R., Mösner, J., Neubert, W., Wohlfarth, D., Alard, J. P., Basrak, Z., Bastid, N., Belayev, I. M., Blaich, T., Buta, A., Caplar, R., Cerruti, C., Cindro, N., Coffin, J. P., Dupieux, P., Erö, J., Fan, Z. G., Fintz, P., Fodor, Z., Freifelder, R., Fraysse, L., Frolov, S., Gobbi, A., Grigorian, Y., Guillaume, G., Herrmann, N., Hildenbrand, K. D., Hölbling, S., Houari, A., Jeong, S. C., Jorio, M., Jundt, F., Kecskemeti, J., Koncz, P., Korchagin, Y., Krämer, M., Kuhn, C., Legrand, I., Lebedev, A., Maguire, C., Manko, V., Matulewicz, T., Mgebrishvili, G., Moisa, D., Montaru, G., Montbel, I., Morel, P., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Sadchikov, A., Schüll, D., Seres, Z., Sikora, B., Simion, V., Smolyankin, S., Sodan, U., Teh, K., Tezkratt, R., Trzaska, M., Vasiliev, M. A., Wagner, P., Wessels, J. P., Wienold, T., Wilhelmi, Z., Zhilin, A. L., 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]
Published
1993

41. Velocity correlations of intermediate mass fragments produced in central collisions of Au + Au at E = 150 A MeV

Author

Kämpfer, Burkhard, Grigorian, Y., Herrmann, N., Fraysse, L., Fintz, P., Fodor, Z., Blaich, Th., Bastid, N., Frolov, S., Basrak, Z., Freifelder, R., Guillaume, G., Gobbi, A., Cerruti, C., Hildenbrand, K. D., Jorio, M., Reisdorf, W., Alard, J. P., Wohlfarth, Dietrich, Krämer, M., Mösner, Jürgen, Legrand, I., Kotte, Roland, Koncz, P., Petrovici, M., Vasiliev, M. A., Belayev, I. M., Teh, K., Sodan, U., Smolyankin, S., Simion, V., Sikora, B., Seres, Z., Schüll, D., Wessels, J. P., Rami, F., Wagner, P., Morel, P., Montbel, I., Montaru, G., Moisa, D., Mgebrishvili, G., Matulewicz, T., Manko, V., Maguire, C., Lebedev, A., Kuhn, C., Sadchikov, A., Coffin, J. P., Hölbling, S., Houari, A., Jeong, S. C., Fan, Z. G., Jundt, F., Kecskemeti, J., Buta, A., Trzaska, M., Cindro, N., Wienold, T., Dupieux, P., Pelte, D., Wilhelmi, Z., Korchagin, Y., Tezkratt, R., Zhilin, A. L., Neubert, Waldemar, Erö, J., and Caplar, R.

Published
1993

42. Results from FOPI on Strangeness in Nuclear Matter at SIS Energies

Author

Crochet, P., Alard, J. P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y. L., Hartmann, O., Herrmann, N., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Koczon, P., 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., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynka, K., Smolyankin, V., Somov, A., Stockmeier, M. R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J. T., Yushmanov, I., Zhilin, A., Crochet, P., Alard, J. P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y. L., Hartmann, O., Herrmann, N., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Koczon, P., 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., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynka, K., Smolyankin, V., Somov, A., Stockmeier, M. R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J. T., Yushmanov, I., and Zhilin, A.

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
2001

43. Differential Directed Flow in Au+Au Collisions

Author

Andronic, A., Reisdorf, W., Alard, J. P., Barret, V., Basrak, Z., Bastid, N., Bendarag, A., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, 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., Koczon, P., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Leifels, Y., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M. R., Stoicea, G., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Andronic, A., Reisdorf, W., Alard, J. P., Barret, V., Basrak, Z., Bastid, N., Bendarag, A., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, 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., Koczon, P., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Leifels, Y., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M. R., Stoicea, G., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Abstract

We present experimental data on directed flow in semi-central Au+Au collisions at incident energies from 90 to 400 AMeV. For the first time for this energy domain, the data are presented in a transverse momentum differential way. We study the first order Fourier coefficient v1 for different particle species and establish a gradual change of its pattern as function of incident energy and for different regions in rapidity.

Published
2001

44. 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., Schüll, 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., 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., 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., Schüll, 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., 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.

Abstract

Experimental data on K+ meson and proton sideward flow measured with the FOPI detector at SIS/GSI in the reactions Ru+Ru at 1.69 AGeV and Ni+Ni at 1.93 AGeV 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 existence of an in-medium repulsive K+ nucleon potential.

Published
2000

45. Azimuthal Dependence of Collective Expansion for Symmetric Heavy-Ion Collisions

Author

Stoicea, G., primary, Petrovici, M., additional, Andronic, A., additional, Herrmann, N., additional, Alard, J. P., additional, Basrak, Z., additional, Barret, V., additional, Bastid, N., additional, Čaplar, R., additional, Crochet, P., additional, Dupieux, P., additional, Dželalija, M., additional, Fodor, Z., additional, Hartmann, O., additional, Hildenbrand, K. D., additional, Hong, B., additional, Kecskemeti, J., additional, Kim, Y. J., additional, Kirejczyk, M., additional, Korolija, M., additional, Kotte, R., additional, Kress, T., additional, Lebedev, A., additional, Leifels, Y., additional, Lopez, X., additional, Merschmeier, M., additional, Neubert, W., additional, Pelte, D., additional, Rami, F., additional, Reisdorf, W., additional, Schüll, D., additional, Seres, Z., additional, Sikora, B., additional, Sim, K. S., additional, Simion, V., additional, Siwek-Wilczyńska, K., additional, Smolyankin, V., additional, Stockmeier, M., additional, Wiśniewski, K., additional, Wohlfarth, D., additional, Yushmanov, I., additional, Zhilin, A., additional, and Danielewicz, P., additional

Published
2004
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46. Stopping and Radial Flow in Central 58Ni + 58Ni 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., Schüll, 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., Schauenburg, B., Dona, R., Dupieux, P., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Häfele, E., Jundt, F., Kecskemeti, J., Korolija, M., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mösner, 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., Vasiliev, M. A., Wagner, P., Wohlfarth, D., Zhilin, A., Hong, B., Herrmann, N., Ritman, J. L., Best, D., Gobbi, A., Hildenbrand, K. D., Kirejczyk, M., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schüll, 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., Schauenburg, B., Dona, R., Dupieux, P., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Häfele, E., Jundt, F., Kecskemeti, J., Korolija, M., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mösner, 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., Vasiliev, M. A., Wagner, P., Wohlfarth, D., and Zhilin, A.

Published
1998

47. Central collisions of Au on Au at 150, 250 and 400 A·MeV

Author

Reisdorf, W., Best, D., Gobbi, A., Herrmann, N., Hildenbrand, K. D., Hong, B., Jeong, S. C., Leifels, Y., Pinkenburg, C., Ritman, J. L., Schüll, D., Sodan, U., Teh, K., Wang, G. S., Wessels, J. P., Wienold, T., Alard, J. P., Amouroux, V., Basrak, Z., Bastid, N., Belyaev, I., Berger, L., Biegansky, J., Bini, M., Boussange, S., Buta, A., Caplar, R., Cindro, N., Coffin, J. P., Crochet, P., Dona, R., Dupieux, P., Dzelalija, M., Erö, J., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Grigorian, Y., Häfele, E., Hölbling, S., Houari, A., Ibnouzahir, M., Joriot, M., Jundt, F., Kecskemeti, J., Kirejczyk, M., Koncz, P., Korchagin, Y., Korolija, M., (0000-0001-7195-4408) Kotte, R., Kuhn, C., Lambrecht, D., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Matulewicz, T., Maurenzig, P. R., Merlitz, H., Mgebrishvili, G., Mösner, J., Mohren, S., Moisa, D., Montarou, G., Montbel, I., Morel, P., Neubert, W., Olmi, A., Pasquali, G., Pelte, D., Petrovici, M., Poggi, G., Pras, P., Rami, F., Ramillien, V., Roy, C., Sadchikov, A., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Taccetti, N., Tezkratt, R., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., Wisniewski, K., Wohlfarth, D., Zhilin, A., Reisdorf, W., Best, D., Gobbi, A., Herrmann, N., Hildenbrand, K. D., Hong, B., Jeong, S. C., Leifels, Y., Pinkenburg, C., Ritman, J. L., Schüll, D., Sodan, U., Teh, K., Wang, G. S., Wessels, J. P., Wienold, T., Alard, J. P., Amouroux, V., Basrak, Z., Bastid, N., Belyaev, I., Berger, L., Biegansky, J., Bini, M., Boussange, S., Buta, A., Caplar, R., Cindro, N., Coffin, J. P., Crochet, P., Dona, R., Dupieux, P., Dzelalija, M., Erö, J., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Grigorian, Y., Häfele, E., Hölbling, S., Houari, A., Ibnouzahir, M., Joriot, M., Jundt, F., Kecskemeti, J., Kirejczyk, M., Koncz, P., Korchagin, Y., Korolija, M., (0000-0001-7195-4408) Kotte, R., Kuhn, C., Lambrecht, D., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Matulewicz, T., Maurenzig, P. R., Merlitz, H., Mgebrishvili, G., Mösner, J., Mohren, S., Moisa, D., Montarou, G., Montbel, I., Morel, P., Neubert, W., Olmi, A., Pasquali, G., Pelte, D., Petrovici, M., Poggi, G., Pras, P., Rami, F., Ramillien, V., Roy, C., Sadchikov, A., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Taccetti, N., Tezkratt, R., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., Wisniewski, K., Wohlfarth, D., and Zhilin, A.

Abstract

Collisions of Au on Au at incident energies of 150, 250 and 400 A·MeV were studied with the FOPI-facility at GSI Darmstadt. Nuclear charge (Z15) and velocity of the products were detected with full azimuthal acceptance at laboratory angles 1lab30. Isotope separated light charged particles were measured with movable multiple telescopes in an angular range of 6-90. Central collisions representing about 1% of the reaction cross section were selected by requiring high total transverse energy, but vanishing side flow. The velocity space distributions and yields of the emitted fragments are reported. The data are analysed in terms of a thermal model including radial flow. A comparison with predictions of the quantum molecular model is presented.

Published
1997

48. 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., 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., and Zhilin, A.

Abstract

Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive 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 gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.

Published
1997

49. K+ production in the reaction 58Ni+58Ni at incident energies from 1 to 2 A GeV

Author

Best, D., Herrmann, N., Hong, B., Kirejczyk, M., Ritman, J., Wisniewski, K., Zhilin, A., Gobbi, A., Hildenbrand, K. D., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schüll, D., Sodan, U., Wang, G. S., Wienold, T., Alard, J. P., Amouroux, V., Bastid, N., Belyaev, I., Berek, G., Biegansky, J., Cherbatchev, R., Coffin, J. P., Crochet, P., Dupieux, P., Fodor, Z., Genoux-Lubain, A., Goebels, G., Guillaume, G., Häfele, E., Jundt, F., Kecskemeti, J., Korchagin, Y., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mösner, J., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pras, P., Rami, F., Roy, C., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczyska, K., Smolyankin, V., Somov, A., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., Wohlfarth, D., Best, D., Herrmann, N., Hong, B., Kirejczyk, M., Ritman, J., Wisniewski, K., Zhilin, A., Gobbi, A., Hildenbrand, K. D., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schüll, D., Sodan, U., Wang, G. S., Wienold, T., Alard, J. P., Amouroux, V., Bastid, N., Belyaev, I., Berek, G., Biegansky, J., Cherbatchev, R., Coffin, J. P., Crochet, P., Dupieux, P., Fodor, Z., Genoux-Lubain, A., Goebels, G., Guillaume, G., Häfele, E., Jundt, F., Kecskemeti, J., Korchagin, Y., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mösner, J., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pras, P., Rami, F., Roy, C., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczyska, K., Smolyankin, V., Somov, A., Tizniti, L., Trzaska, M., Vasiliev, M. A., Wagner, P., and Wohlfarth, D.

Abstract

Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of 58Ni with 58Ni nuclei. The transverse mass (mt) spectra have been studied as a function of rapidity at a beam energy 1.93 A GeV. The mt distributions of K+ mesons are well described by a single Boltzmann-type function. The spectral slopes are similar to that of the protons indicating that rescattering plays a significant role in the propagation of the kaon. Multiplicity densities have been obtained as a function of rapidity by extrapolating the Boltzmann-type fits to the measured distributions over the remaining phase space. The total K+ meson yield has been determined at beam energies of1.06, 1.45, and 1.93 A GeV, and is presented in comparison to existing data. The low total yield indicates that the K+ meson can not be explained within a hadro-chemical equilibrium scenario, therefore indicating that the yield does remain sensitive to effects related to its production processes such as the equation of state of nuclear matter and/or modifications to the K+ dispersion relation.

Published
1997

50. Differential directed flow in Au+Au collisions

Author

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

Published
2001
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