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7 results on '"Kecskemeti, J."'

1. 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.

Subjects
ddc
Published
2017

2. Centrality dependence of subthreshold $��$ meson production in Ni+Ni collisions at 1.9A GeV

Author

Piasecki, K., Tymi��ski, Z., 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., Wagner, P., Weber, I., Widmann, E., Wi��niewski, K., Xiao, Z. G., Xu, H. S., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

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

We analysed the $��$ 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 $��$ meson production in heavy-ion collisions. The rise of $��$ meson multiplicity per event with mean number of participants can be parameterized by the power function with exponent $��= 1.8 \pm 0.6$. The ratio of $��$ 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 $0.36 \pm 0.05$., 9 pages, 5 figures

Published
2016
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3. Influence of $��$ 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., ��aplar, R., 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., Kotte, R., Lebedev, A., Leifels, Y., F��vre, A. Le, Liu, J. L., Lopez, X., Manko, V., Marton, J., Matulewicz, T., M��nzer, R., 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., Suzuki, K., Tymi��ski, Z., Wagner, P., Weber, I., Widmann, E., Wi��niewski, K., Xiao, Z. G., Yushmanov, I., Zhang, Y., Zhilin, A., Zinyuk, V., and Zmeskal, J.

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

$��$ 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 $��$ mesons are presented. The $��$\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 $��$ 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 $��$ mesons to negative kaons., 8 pages, 6 figures

Published
2014
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4. 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
FOS: Physical sciences, Nuclear Experiment (nucl-ex), 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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5. Isospin dependence of relative yields of $K^+$ and $K^0$ mesons at 1.528 AGeV

Author

Lopez, X., J. Kim, Y., Herrmann, N., Andronic, A., Barret, V., Basrak, Z., Bastid, N., L. Benabderrahmane, M., 268aplar, R., Cordier, E., Crochet, P., Dupieux, P., Dželalija, M., Fodor, Z., Gašparic, I., Grishkin, Y., N. Hartmann, O., D. Hildenbrand, K., Hong, B., I. Kang, T., Kecskemeti, J., Kirejczyk, M., Kiš, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., S. Ryu, M., Schüttauf, A., Seres, Z., Sikora, B., S. Sim, K., Simion, V., Siwek-Wilczy&#324ska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., G. Xiao, Z., Yushmanov, I., Y. Zhang, X., Zhilin, A., Ferini, G., Gaitanos, T., 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), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
25.75.Dw, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Results on $K^+$ and $K^0$ meson production in $^{96}_{44}$Ru + $^{96}_{44}$Ru and $^{96}_{40}$Zr + $^{96}_{40}$Zr collisions at a beam kinetic energy of 1.528$A$ GeV, measured with the FOPI detector at GSI-Darmstadt, are investigated as a possible probe of isospin effects in high density nuclear matter. The measured double ratio ($K^+/K^0$)$_{Ru}$/($K^+/K^0$)$_{Zr}$ is compared to the predictions of a thermal model and a Relativistic Mean Field transport model using two different collision scenarios and under different assumptions on the stiffness of the symmetry energy. We find a good agreement with the thermal model prediction and the assumption of a soft symmetry energy for infinite nuclear matter while more realistic transport simulations of the collisions show a similar agreement with the data but also exhibit a reduced sensitivity to the symmetry term., Comment: 5 pages, 3 figures. accepted for publication in Phys. Rev. C

Published
2007
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6. Sub-threshold phi-meson yield in central 58Ni+58Ni collisions

Author

Mangiarotti, A., Herrmann, N., Maurenzig, P. R., Gobbi, A., Kotte, R., Kecskemeti, J., and Leifels, Y.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), 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 \nuc{58}{Ni}+\nuc{58}{Ni} central collisions. The $\phi$ data were obtained within the acceptance of the CDC/Barrel subsystem of FOPI. For a sample of $4.7\cdot 10^6$ central events, after background subtraction, 23 candidates were observed. Extensive GEANT simulations of the detector performance are shown in a thorough comparison to the real response, aiming at a good understanding of the apparatus and at a trustable determination of the efficiencies, production probability and possible systematic errors. A filter procedure is elaborated, which is meant to facilitate the comparison of any theoretical calculation or new data with the current ones. How to extrapolate the present value to a $\phi$-meson cross section in $4\pi$ is also discussed. This result on pseudo-vector mesons can now be compared to existing experimental knowledge for the same reaction at the same incident energy for various outgoing channels, $K^+$ and $K^-$ included. A significant fraction (at least 20%) of the $K^-$-mesons is originating in the decay of the $\phi$, supporting the statement that the two channels are strongly correlated., Comment: 48 pages, 10 figures submitted to Nucl.-Phys. A Minor wording corrections, a small inconsistency has been corrected in sect.3.3

Published
2002
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7. 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., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Abundance (chemistry), Nuclear Theory, FOS: Physical sciences, Pion, Delta resonance, Thermal model, Freeze-out, 01 natural sciences, 7. Clean energy, Spectral line, Delta baryon, Nuclear physics, Excited state, 0103 physical sciences, Thermal, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Beam (structure)
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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