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

Author

Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Fèvre, A. Le, Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Münzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semi-central collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K$^-$\K$^+$ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of $\phi$(1020) meson decays to the K$^-$ yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of K$^-$ to K$^+$ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at 1.23A and 1.76A GeV indicate that after inclusion of the $\phi$ meson decay contribution to the K$^-$ production no difference between the slopes of the K$^-$ and K$^+$ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the $\phi$ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of $\Lambda(1520) \rightarrow p\text{K}^-$ decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance., Comment: 8 pages, 4 figures, 2 tables (1 appendix table)

Published
2018
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2. Determination of N* amplitudes from associated strangeness production in p+p collisions

Author

Münzer, R., Fabbietti, L., Epple, E., Klose, P., Hauenstein, F., Herrmann, N., Grzonka, D., Leifels, Y., Maggiora, M., Pleiner, D., Ramstein, B., Ritman, J., Roderburg, E., Salabura, P., Sarantsev, A., Basrak, Z., Buehler, P., Cargnelli, M., Caplar, R., Clement, H., Czerwiakowa, O., Deppner, I., Eyrich, M. Dzelalija W., Fodor, Z., Gasik, P., Gasparic, I., Gillitzer, A., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kis, M., Koczon, P., Kotte, R., Lebedev, A., Fevre, A. Le, Liu, J. L., Manko, V., Marton, J., Matulewicz, T., Piasecki, K., Rami, F., Reischl, A., Ryu, M. S., Schmidt, P., Seres, Z., Sikora, B., Sim, K. S., Siwek-Wilczynska, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Weber, I., Widmann, E., Wisniewski, K., Xiao, Z. G., Yamasaki, T., Yushmanov, I., Wintz, P., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We present the first determination of the energy-dependent production amplitudes of N$^{*}$ resonances with masses between 1650 MeV/c$^{2}$ and 1900 MeV/c$^{2}$ for an excess energy between $0$ and $600$ MeV. A combined Partial Wave Analysis of seven exclusively reconstructed data samples for the reaction p+p $\rightarrow pK\Lambda$ measured by the COSY-TOF, DISTO, FOPI and HADES collaborations in fixed target experiments at kinetic energies between 2.14 and 3.5 GeV is used to determine the amplitude of the resonant and non-resonant contributions., Comment: 9 pages 4 figures

Published
2017
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3. Centrality dependence of subthreshold $\phi$ meson production in Ni+Ni collisions at 1.9A GeV

Author

Piasecki, K., Tymiński, Z., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Fèvre, A. Le, Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Münzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We analysed the $\phi$ meson production in central Ni+Ni collisions at the beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found the production probability per event of $[8.6 ~\pm~ 1.6 ~(\text{stat}) \pm 1.5 ~(\text{syst})] \times 10^{-4}$. This new data point allows for the first time to inspect the centrality dependence of the subthreshold $\phi$ meson production in heavy-ion collisions. The rise of $\phi$ meson multiplicity per event with mean number of participants can be parameterized by the power function with exponent $\alpha = 1.8 \pm 0.6$. The ratio of $\phi$ to $\text{K}^-$ production yields seems not to depend within the experimental uncertainties on the collision centrality, and the average of measured values was found to be $0.36 \pm 0.05$., Comment: 9 pages, 5 figures

Published
2016
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4. Strange meson production in Al+Al collisions at 1.9A GeV

Author

Gasik, P., Piasecki, K., Herrmann, N., Leifels, Y., Matulewicz, T., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Fèvre, A. Le, Liu, J. L., Lopez, X., Manko, V., Marton, J., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

The production of K$^+$, K$^-$ and $\varphi$(1020) mesons is studied in Al+Al collisions at a beam energy of 1.9A GeV which is close or below the production threshold in NN reactions. Inverse slopes, anisotropy parameters, and total emission yields of K$^{\pm}$ mesons are obtained. A comparison of the ratio of kinetic energy distributions of K$^-$ and K$^+$ mesons to the HSD transport model calculations suggests that the inclusion of the in-medium modifications of kaon properties is necessary to reproduce the ratio. The inverse slope and total yield of $\phi$ mesons are deduced. The contribution to K$^-$ production from $\phi$ meson decays is found to be [17 $\pm$ 3 (stat) $^{+2}_{-7}$ (syst)] %. The results are in line with previous K$^{\pm}$ and $\phi$ data obtained for different colliding systems at similar incident beam energies., Comment: 16 pages, 11 figures

Published
2015
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5. Influence of $\phi$ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy

Author

Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Leifels, Y., Fèvre, A. Le, Liu, J. L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

$\phi$ and K$^-$ mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semi-central events amounting to 51% of the total cross section. The phase space distributions, and the total yield of K$^-$, as well as the kinetic energy distribution and the total yield of $\phi$ mesons are presented. The $\phi$\K$^-$ ratio is found to be $0.44 \pm 0.07(\text{stat}) ^{+0.18}_{-0.12} (\text{syst})$, meaning that about 22% of K$^-$ mesons originate from the decays of $\phi$ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signalling that a considerable share of gap between the slopes of K$^+$ and K$^-$ could be explained by the contribution of $\phi$ mesons to negative kaons., Comment: 8 pages, 6 figures

Published
2014
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6. Azimuthal Emission Patterns of $K^{+}$ and of $ K^{-} $ Mesons in Ni + Ni Collisions near the Strangeness Production Threshold

Author

Zinyuk, V., Kang, T. I., Leifels, Y., Herrmann, N., Hong, B., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Carevic, I., Crochet, P., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Fèvre, A. Le, Liu, J. L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., ilczyńska, K. Siwek, Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

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

Published
2014
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7. Determining the 7Li(n,gamma) cross section via Coulomb dissociation of 8Li

Author

Izsak, R., Horvath, A., Kiss, A., Seres, Z., Galonsky, A., Bertulani, C. A., Fulop, Zs., Baumann, T., Bazin, D., Ieki, K., Bordeanu, C., Carlin, N., Csanad, M., Deak, F., DeYoung, P., Frank, N., Fukuchi, T., Gade, A., Galaviz, D., Hoffman, C. R., Peters, W. A., Schelin, H., Thoennessen, M., and Veres, G. I.

Subjects
Nuclear Experiment
Abstract

The applicability of Coulomb dissociation reactions to determine the cross section for the inverse neutron capture reaction was explored using the reaction 8Li(gamma,n)7Li. A 69.5 MeV/nucleon 8Li beam was incident on a Pb target, and the outgoing neutron and 7Li nucleus were measured in coincidence. The deduced (n,gamma) excitation function is consistent with data for the direct capture reaction 7Li(n,gamma)8Li and with low-energy effective field theory calculations., Comment: Accepted for publication in Phys. Rev. C

Published
2013
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9. Systematics of azimuthal asymmetries in heavy ion collisions in the 1 A GeV regime

Author

FOPI Collaboration, Reisdorf, W., Leifels, Y., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Gasik, P., Grishkin, Y., Hartmann, O. N., Herrmann, N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kis, M., Koczon, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Lopez, X., Matulewicz, T., Merschmeyer, M., Neubert, W., Petrovici, M., Piasecki, K., Rami, F., Ryu, M. S., Schuettauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tyminski, Z., Wisniewski, K., Wohlfarth, D., Xiao, Z. G., Xu, H. S., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

Using the large acceptance apparatus FOPI, we study central and semi-central collisions in the reactions (energies in A GeV are given in parentheses): 40Ca+40Ca (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), 58Ni+58Ni (0.15, 0.25, 0.4), 96Ru+96Ru (0.4, 1.0, 1.5), 96Zr+96Zr (0.4, 1.0, 1.5), 129Xe+CsI (0.15, 0.25, 0.4), 197Au+197Au (0.09, 0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include directed and elliptic flow. The data are compared to earlier data where possible and to transport model simulations. A stiff nuclear equation of state is found to be incompatible with the data. Evidence for extra-repulsion of neutrons in compressed asymmetric matter is found., Comment: 70 pages, 52 figures; accepted for publication in Nuclear Physics A

Published
2011

10. Systematics of central heavy ion collisions in the 1A GeV regime

Author

FOPI Collaboration, Reisdorf, W., Andronic, A., Averbeck, R., Benabderrahmane, M. L., Hartmann, O. N., Herrmann, N., Hildenbrand, K. D., Kang, T. I., Kim, Y. J., Kis, M., Koczon, P., Kress, T., Leifels, Y., Merschmeyer, M., Piasecki, K., Schuettauf, A., Stockmeier, M., Barret, V., Basrak, Z., Bastid, N., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Gasik, P., Grishkin, Y., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Lopez, X., Matulewicz, T., Neubert, W., Petrovici, M., Rami, F., Ryu, M. S., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wisniewski, K., Wohlfarth, D., Xiao, Z. G., Xu, H. S., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Experiment
Abstract

Using the large acceptance apparatus FOPI, we study central collisions in the reactions (energies in A GeV are given in parentheses): 40Ca+40Ca (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), 58Ni+58Ni (0.15, 0.25, 0.4), 96Ru+96Ru (0.4, 1.0, 1.5), 96Zr+96Zr (0.4, 1.0, 1.5), 129Xe+CsI (0.15, 0.25, 0.4), 197Au+197Au (0.09, 0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include cluster multiplicities, longitudinal and transverse rapidity distributions and stopping, and radial flow. The data are compared to earlier data where possible and to transport model simulations., Comment: 71 pages, 48 figures, version accepted for publication in Nuclear Physics A minor revisions of data in Figs.22 to 26 and Fig.33, added clarifying text,corrected typos

Published
2010
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11. Measurement of the in-medium K0 inclusive cross section in pi- -induced reactions at 1.15 GeV/c

Author

Benabderrahmane, M. L., Herrmann, N., Wisniewski, K., Kecskemeti, J., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Buehler, P., Cargnelli, M., Caplar, R., Cordier, E., Deppner, I., Crochet, P., Dupieux, P., Dzelalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gasparic, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kienle, P., Kirejczyk, M., Kim, Y. J., Kis, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Lopez, X., Manko, V., Marton, J., Mangiarotti, A., Merschmeyer, M., Matulewicz, T., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Widmann, E., Xiao, Z. G., Yamazaki, T., Yushmanov, I., Zhang, X. Y., Zhilin, A., Zmeskal, J., Bratkovskaya, E., and Cassing, W.

Subjects
Nuclear Experiment
Abstract

The K0 meson production by pi- mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn and Pb nuclear targets was measured with the FOPI spectrometer at the SIS accelerator of GSI. Inclusive production cross-sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross-sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness-production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN-potential of 20+-5 MeV at normal nuclear matter density., Comment: 4 pages, 3 figures. References corrected. Minor corrections in text and author list. Figure 3 corrected. Corrections in body and abstract after comments from the referees

Published
2008
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12. Azimuthal dependence of collective expansion for symmetric heavy ion collisions

Author

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

Subjects
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 BUU calculations is obtained for a soft nuclear equation of state., Comment: 4 pages, 4 figures, accepted at Phys. Rev. Lett

Published
2004
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13. 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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14. 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, Dzelalija M., 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, 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., Resdorf, W., de Schauenberg, B., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear physics and radiation physics
Published
2000

15. SiΛvio: A trigger for Λ-hyperons

Author

Münzer, Robert, Berger, Martin, Fabbietti, Laura, Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M.L., Buehler, P., Cargnelli, M., Čaplar, R., Carevic, I., Charviakova, V., Crochet, P., Deppner, I., Dupieux, P., Dželalija, M., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, M., Kienle, P., Koczon, P., Kotte, R., Lebedev, A., Leifels, Y., Liu, J.L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wiśniewski, K., Xiao, Z.G., Yamazaki, T., Yushmanov, I., Zhang, X.Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Published
2014
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16. Can the neutron-capture cross sections be measured with Coulomb dissociation?

Author

Horváth, Á., Ieki, K., Kiss, Á., Galonsky, A., Thoennessen, M., Baumann, T., Bazin, D., Bertulani, C. A., Bordeanu, C., Carlin, N., Csanád, M., Deák, F., DeYoung, P., Frank, N., Fukuchi, T., Fülöp, Zs., Gade, A., Galaviz, D., Hoffman, C., Izsák, R., Peters, W. A., Schelin, H., Schiller, A., Sugo, R., Seres, Z., Veres, G. I., Fülöp, Zsolt, editor, Gyürky, György, editor, and Somorjai, Endre, editor

Published
2006
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17. Strange meson production in Al+Al collisions at 1.9 A GeV

Author

Gasik, P., Piasecki, K., Herrmann, N., Leifels, Y., Matulewicz, T., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Le Fèvre, A., Liu, J. L., Lopez, X., Manko, V., Marton, J., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Published
2016
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18. Systematics of azimuthal asymmetries in heavy ion collisions in the [formula omitted] regime

Author

Reisdorf, W., Leifels, Y., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M.L., Čaplar, R., Crochet, P., Dupieux, P., Dželalija, M., Fodor, Z., Gasik, P., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, M., Koczoń, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Lopez, X., Matulewicz, T., Merschmeyer, M., Neubert, W., Petrovici, M., Piasecki, K., Rami, F., Ryu, M.S., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tymiński, Z., Wiśniewski, K., Wohlfarth, D., Xiao, Z.G., Xu, H.S., Yushmanov, I., and Zhilin, A.

Published
2012
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19. Systematics of central heavy ion collisions in the [formula omitted] regime

Author

Reisdorf, W., Andronic, A., Averbeck, R., Benabderrahmane, M.L., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Kang, T.I., Kim, Y.J., Kiš, M., Koczoń, P., Kress, T., Leifels, Y., Merschmeyer, M., Piasecki, K., Schüttauf, A., Stockmeier, M., Barret, V., Basrak, Z., Bastid, N., Čaplar, R., Crochet, P., Dupieux, P., Dželalija, M., Fodor, Z., Gasik, P., Grishkin, Y., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Lopez, X., Matulewicz, T., Neubert, W., Petrovici, M., Rami, F., Ryu, M.S., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Tymiński, Z., Wiśniewski, K., Wohlfarth, D., Xiao, Z.G., Xu, H.S., Yushmanov, I., and Zhilin, A.

Published
2010
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20. Systematics of pion emission in heavy ion collisions in the [formula omitted] regime

Author

Reisdorf, W., Stockmeier, M., Andronic, A., Benabderrahmane, M.L., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Kim, Y.J., Kiš, M., Koczoń, P., Kress, T., Leifels, Y., Lopez, X., Merschmeyer, M., Schüttauf, A., Barret, V., Basrak, Z., Bastid, N., Čaplar, R., Crochet, P., Dupieux, P., Dželalija, M., Fodor, Z., Grishkin, Y., Hong, B., Kang, T.I., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Matulewicz, T., Neubert, W., Petrovici, M., Rami, F., Ryu, M.S., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Tymiński, Z., Wiśniewski, K., Wohlfarth, D., Xiao, Z.G., Xu, H.S., Yushmanov, I., and Zhilin, A.

Published
2007
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21. Two-proton small-angle correlations in central heavy-ion collisions: A beam-energy- and system-size-dependent study

Author

Kotte, R., Alard, J. P., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Čaplar, R., Cordier, E., Crochet, P., Dupieux, P., Dželalija, M., Fodor, Z., Gašparić, I., 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., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Mösner, J., 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-Wilczyńska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wagner, P., Wiśniewski, K., Wohlfarth, D., Xiao, Z. G., Yushmanov, Y., and Zhilin, A.

Published
2005
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23. 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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24. 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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25. 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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26. 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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27. 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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29. Wide-acceptance measurement of the K−/K+ ratio from Ni+Ni collisions at 1.91A GeV

Author

Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Le Fèvre, A., Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Münzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tymiński, Z., Wagner, P., Weber, Ivana, Widmann, E., Wiśniewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., Zmeskal, J., and FOPI Collaboration

Subjects
Nuclear Theory, High Energy Physics::Experiment, heavy-ion collisions, charged kaons, in-medium, strange particles, Nuclear Experiment
Abstract

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

Published
2019

30. Wide acceptance measurement of the K$^-$/K$^+$ ratio from Ni+Ni collisions at 1.91A GeV

Author

Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., ��aplar, R., Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., D��elalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Ga��pari��, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Ki��, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., F��vre, A. Le, Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., M��nzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Sch��ttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczy��ska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tymi��ski, Z., Wagner, P., Weber, I., Widmann, E., Wi��niewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., Zmeskal, J., Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), FOPI, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
energy: kinetic, Nuclear Theory, FOS: Physical sciences, Relativistic Nuclear Collisions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], beam: energy, Automatic Keywords, meson: decay, nucleon nucleon, HADES, 1.91 GeV/nucleon, 25.75.Dw, K: spectrum, synchrotron, slope, FOPI, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Phi(1020): decay, Nuclear Experiment, 13.60.Le, yield: ratio, acceptance, experimental results
Abstract

The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semi-central collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K$^-$\K$^+$ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of $\phi$(1020) meson decays to the K$^-$ yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of K$^-$ to K$^+$ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at 1.23A and 1.76A GeV indicate that after inclusion of the $\phi$ meson decay contribution to the K$^-$ production no difference between the slopes of the K$^-$ and K$^+$ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the $\phi$ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of $\Lambda(1520) \rightarrow p\text{K}^-$ decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance., Comment: 8 pages, 4 figures, 2 tables (1 appendix table)

Published
2019

31. Shape parameters of the participant source in Ru + Ru collisions at [formula omitted]

Author

Bastid, N., Dupieux, P., Bendarag, A., Barret, V., Crochet, P., Lopez, X., Alard, J.P., Andronic, A., Basrak, Z., Benabderrahmane, M.L., Čaplar, R., Cordier, E., Dželalija, M., Fodor, Z., Gašparić, I., 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., Lebedev, A., Leifels, Y., Mangiarotti, A., Manko, V., Merschmeyer, M., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., de Schauenburg, B., Schuettauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolarkiewicz, M.M., Smolyankin, V., Soliwoda, I.J., Stockmeier, M.R., Stoicea, G., Tyminski, Z., Wagner, P., Wiśniewski, K., Wohlfarth, D., Xiao, Z., Yushmanov, I., and Zhilin, A.

Published
2004
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33. Determination of N* amplitudes from associated strangeness production in p+p collisions

Author

Münzer, R., Fabbietti, L., Epple, E., Lu, S., Klose, P., Hauenstein, F., Herrmann, N., Grzonka, D., Leifels, Y., Maggiora, M., Pleiner, D., Ramstein, B., Ritman, J., Roderburg, E., Salabura, P., Sarantsev, A., Basrak, Z., Buehler, P., Cargnelli, M., Čaplar, R., Clement, H., Czerwiakowa, O., Deppner, I., Dželalija, M., Eyrich, W., Fodor, Z., Gasik, P., Gašparić, I., Gillitzer, A., Grishkin, Y., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Le Fèvre, A., Liu, J.L., Manko, V., Marton, J., Matulewicz, T., Piasecki, K., Rami, F., Reischl, A., Ryu, M.S., Schmidt, P., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z.G., Yamasaki, T., Yushmanov, I., Wintz, P., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Published
2018
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34. Determination of $N^{\ast }$ amplitudes from associated strangeness production in p+p collisions

Author

Münzer, R., Fabbietti, L., Epple, E., Lu, S., Klose, P., Hauenstein, F., Herrmann, N., Grzonka, D., Leifels, Y., Maggiora, M., Pleiner, D., Ramstein, B., Ritman, J., Roderburg, E., Salabura, Piotr, Sarantsev, A., Basrak, Z., Buehler, P., Cargnelli, M., Čaplar, R., Clement, H., Czerwiakowa, O., Deppner, I., Dželalija, M., Eyrich, W., Fodor, Z., Gasik, P., Gašparić, I., Gillitzer, A., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Le Fèvre, A., Liu, J. L., Manko, V., Marton, J., Matulewicz, T., Piasecki, K., Rami, F., Reischl, A., Ryu, M. S., Schmidt, P., Seres, Z., Sikora, B., Sim, K. S., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yamasaki, T., Yushmanov, I., Wintz, P., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
hyperon–nucleon interaction, hadrons, strangeness, resonance, scattering length, partial wave analysis
Published
2018

35. 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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36. Neutron yields from 155 MeV/nucleon carbon and helium stopping in aluminum

Author

Heilbronn, L, Cary, R. S, Cronqvist, M, Deak, F, Frankel, K, Galonsky, A, Holabird, K, Horvath, A, Kiss, A, Kruse, J, Ronningen, R. M, Schelin, H, Seres, Z, Stronach, C. E, Wang, J, Zecher, P, Zeitlin, C, and Miller, J

Subjects
Nuclear Physics
Abstract

Neutron fluences have been measured from 155 MeV/nucleon 4He and 12C ions stopping in an Al target at laboratory angles between 10 and 160 deg. The resultant spectra were integrated over angle and energy above 10 MeV to produce total neutron yields. Comparison of the two systems shows that approximately two times as many neutrons are produced from 155 MeV/nucleon 4He stopping in Al and 155 MeV/nucleon 12C stopping in Al. Using an energy-dependent geometric cross-section formula to calculate the expected number of primary nuclear interactions shows that the 12C + Al system has, within uncertainties, the same number of neutrons per interaction (0.99 +/- 0.03) as does the 4He + Al system (1.02 +/- 0.04), despite the fact that 12C has three times as many neutrons as does 4He. Energy and angular distributions for both systems are also reported. No major differences can be seen between the two systems in those distributions, except for the overall magnitude. Where possible, the 4He + Al spectra are compared with previously measured spectra from 160 and 177.5 MeV/nucleon 4He interactions in a variety of stopping targets. The reported spectra are consistent with previously measured spectra. The data were acquired to provide data applicable to problems dealing with the determination of the radiation risk to humans engaged in long-term missions in space; however, the data are also of interest for issues related to the determination of the radiation environment in high-altitude flight, with shielding at high-energy heavy-ion accelerators and with doses delivered outside tumor sites treated with high-energy hadronic beams.

Published
1999

37. 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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38. Centrality dependence of subthreshold φ meson production in Ni+Ni collisions at 1.9A GeV

Author

Piasecki, K., Tyminski, Z., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Caplar, R., Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dzelalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gasparic, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kis, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Le Fevre, A., Liu, J. L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Münzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Wagner, P., Weber, I., Widmann, E., Wisniewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

We analysed the φ meson production in central Ni+Ni collisions at the beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found the production probability per event of [8.6 +- 0.9 (stat) +- 1.5 (syst)] x 10-4. This new data point allows for the first time to inspect the centrality dependence of the subthreshold φ meson production in heavy-ion collisions. The rise of φ meson multiplicity per event with mean number of participants can be parametrized by the power function with exponent α = 1.6 +- 0.5. The ratio of φ to K- production yields seems not to depend within the experimental uncertainties on the collision centrality, and the average of measured values was found to be 0.37 +- 0.05.

Published
2016

39. Centrality dependence of subthreshold phi meson production in Ni plus Ni collisions at 1.9A GeV

Author

Piasecki, K., Tyminski, Z., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Cordier, E., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Lebedev, A., Leifels, Y., Le Fevre, A., Liu, J.L., Lopez, X., Mangiarotti, A., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Munzer, R., Pelte, D., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek- Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Wagner, P., Weber, Ivana, Widmann, E., Wisniewski, K., Xiao, Z.G., Xu, H.S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
High Energy Physics::Experiment, heavy-ion collisions, ni-58+ni-58 collisions, sis energies, 2 agev, strangeness, symmetry, detector, kaons, fopi, Nuclear Experiment
Abstract

We analyzed the ϕ meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6±1.6(stat) ±1.5(syst)]×10−4. This new data point allows us for the first time to inspect the centrality dependence of subthreshold ϕ meson production in heavy-ion collisions. The rise of ϕ meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent α=1.8±0.6. The ratio of ϕ to K− production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36±0.05.

Published
2016

40. Influence of Phi mesons on negative kaons in Ni + Ni collisions at 1.91A GeV beam energy

Author

Piasecki, K., Herrmann, K., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P, Cargnelli, M., Čaplar, Roman, Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O.N., Hildenbrand, K.D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Kotte, R., Lebedev, A., Leifels, Y., Le Fèvre, A., Liu, J.L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, Ivana, Widmann, E., Wiśniewski, K., Xiao, Z.G, Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Theory, Heavy ion reactions, Negative Kaons, Phi mesons, High Energy Physics::Experiment, Nuclear Experiment
Abstract

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

Published
2015

41. Influence of ϕ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy

Author

Piasecki, K., Herrmann, N., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Crochet, P., Czerwiakowa, O., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Leifels, Y., Le Fèvre, A., Liu, J. L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tymiński, Z., Wagner, P., Weber, I., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

ϕ and K− mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semi-central events amounting to 51% of the total cross section. The phase space distributions, and the total yield of K−, as well as the kinetic energy distribution and the total yield of ϕ mesons are presented. The ϕ\K− ratio is found to be 0.44±0.07(stat)+0.18−0.12(syst), meaning that about 22% of K− mesons originate from the decays of ϕ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signalling that a considerable share of gap between the slopes of K+ and K− could be explained by the contribution of ϕ mesons to negative kaons.

Published
2014

42. Azimuthal Emission Patterns of K+ and of K- Mesons in Ni+Ni Collisions near the Strangeness Production Threshold

Author

Zinyuk, V., Kang, T. I., Leifels, Y., Herrmann, N., Hong, B., Averbeck, R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, R., Carevic, I., Crochet, P., Deppner, I., Dupieux, P., Dželalija, M., Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Kiš, M., Koczon, P., Kotte, R., Lebedev, A., Le Fèvre, A., Liu, J. L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Münzer, R., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M. S., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczyńska, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wiśniewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zmeskal, J., Bratkovskaya, E., and Hartnack, C.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Azimuthal emission patterns of K ± mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum p T integrated directed and elliptic flow of K + and K − mesons as well as the centrality dependence of p T - differential directed flow of K + mesons are compared to the predictions of hadron string dynamics and isospin quantum molecular dynamics transport models. The data exhibits different propagation patterns of K + and K − mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for K + mesons and attractive for K − mesons.

Published
2014

43. Azimuthal emission patterns of K+ and of K- mesons in Ni plus Ni collisions near the strangeness production threshold

Author

Zinyuk, V., Kang, T.I., Leifels, Y., Herrmann, N., Hong, B., Averbeck, R., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Berger, M., Buehler, P., Cargnelli, M., Čaplar, Roman, Carević, Ivana, Crochet, P., Deppner, I., Dupieux, P., Dželalija, Mile, Fabbietti, L., Fodor, Z., Gasik, P., Gašparić, Igor, Grishkin, Y., Hartmann, O. N., Hildenbrand, K.D., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Kotte, R., Lebedev, A., Le Fevre, A., Liu, J.L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., Munzer, R., Petrovici, M., Piasecki, K., Rami, F., Reischl, A., Reisdorf, W., Ryu, M.S., Schmidt, P., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynka, K., Smolyankin, V., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wisniewski, K., Xiao, Z.G., Yushmanov, I, Zhang, Y, Zhilin, A, and Zmeskal, J.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, heavy-ion collisions, relativistic nuclear collisions, equation-of-state, antikaon production, kaon production, dense nuclear, sis energies, matter, flow, dynamics
Abstract

Azimuthal emission patterns of K+/- mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum p(T) integrated directed and elliptic flow of K+ and K- mesons as well as the centrality dependence of p(T) - differential directed flow of K+ mesons are compared to the predictions of hadron string dynamics and isospin quantum molecular dynamics transport models. The data exhibits different propagation patterns of K+ and K- mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for K+ mesons and attractive for K- mesons.

Published
2014

44. Determining the 7Li(n,gamma) cross section via Coulomb dissociation of 8Li

Author

Izsak, R, Horvath, A, Kiss, A, Seres, Z, Galonsky, A, Bertulani, C A, Fulop, Zs, Baumann, T, Bazin, D, Ieki, K, Bordeanu, C, Carlin, N, Csanad, M, Deak, F, DeYoung, P, Frank, N, Fukuchi, T, Gade, A, Galaviz, D, Hoffman, C R, Peters, W A, Schelin, H, Thoennessen, M, and Veres, G I

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), nucl-ex, Nuclear Experiment
Abstract

The applicability of Coulomb dissociation reactions to determine the cross section for the inverse neutron capture reaction was explored using the reaction 8Li(gamma,n)7Li. A 69.5 MeV/nucleon 8Li beam was incident on a Pb target, and the outgoing neutron and 7Li nucleus were measured in coincidence. The deduced (n,gamma) excitation function is consistent with data for the direct capture reaction 7Li(n,gamma)8Li and with low-energy effective field theory calculations., Accepted for publication in Phys. Rev. C

Published
2013

49. Systematics of azimuthal asymmetries in heavy ion collisions in the 1A GeV regime

Author

Reisdorf, W., Leifels, Y., Andronić, A., Averbeck, R., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M. L., Čaplar, Roman, Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gasik, P., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K. D., Hong, B., Kang, T.I., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Kiš, Mladen, Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Lopez, X., Matulewicz, T., Merschmeyer, M., Neubert, W., Petrovici, M., Piasecki, K., Rami, F., Ryu, M.S., Schuttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tyminski, Z, Wisniewski, K., Wohlfarth, D., Xiao, Z.G., Xu, H.S., Yushmanov, I., and Zhilin, A.

Subjects
nuclear physics, heavy-ions, directed and elliptic flow
Abstract

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

Published
2012

50. Systematics of azimuthal asymmetries in heavy ion collisions in the 1 A GeV regime

Author

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

Abstract

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

Published
2012

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