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638 results on '"Korolija M"'

201. 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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202. Subthreshold production of $\Sigma$(1385) baryons in Al+Al collisions at 1.9 A GeV

Author

Lopez, X., Herrmann, N., Crochet, P., Andronic, A., Barret, V., Basrak, Z., Bastid, N., L. Benabderrahmane, M., Buehler, P., Cargnelli, M., Caplar, R., Cordier, E., Dupieux, P., D&#711zelalija, M., Fabbietti, L., Fodor, Z., Gaspari'C, I., Grishkin, Y., N. Hartmann, O., D. Hildenbrand, K., Hong, B., I. Kang, T., Kecskemeti, J., Kirejczyk, M., J. Kim, Y., Kis, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Manko, V., Marton, J., Matulewicz, T., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Piasecki, K., Rami, F., Reisdorf, W., S. Ryu, M., Schmidt, P., Schüttauf, A., Seres, Z., Sikora, B., S. Sim, K., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tyminski, Z., Wagner, P., Widmann, E., Wisniewski, K., Wohlfarth, D., G. Xiao, Z., Yushmanov, I., Y. Zhang, X., Zhilin, A., Zmeskal, J., 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, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

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

Published
2007
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203. Subthreshold production of Sigma(1385) baryons in Al+Al collisions at 1.9A GeV

Author

Lopez, X., Herrmann, N., Crochet, P., Andronic, A., Basrak, Z., Bastid, N., Benabderrahmane, M. L., Bühler, P., Cargnelli, M., Caplar, R., Cordier, E., Dupieux, P., Dzelalija, M., Fabietti, L., Fodor, Z., Gasparic, I., Grishkin, Y., Hartmann, O. N., Hildenbrand, K. D., Hong, B., Kang, T. I., Kecskemeti, J., Kirejczyk, M., Kim, Y. J., Kis, M., Koczon, P., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Marton, J., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Ryu, M. S., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Suzuki, K., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z., Yushmanov, I., Zhang, X. Y., Zhilin, A., Zmeskal, J., Kienle, P., and Yamazaki, T.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

First deep sub-threshold production of the Sigma(1385) hyperon resonance is presented. The measurement was performed in Al+Al collisions at a beam energy of 1.9A GeV with the FOPI detector at GSI-Darmstadt. The result is found to be in relatively good agreement with the statistical model prediction. It allows to better understand strangeness sub-threshold production by leading information on the strangeness exchange reaction which is the dominant process for K- production below and close-to threshold.

Published
2007

204. Systematics of pion emission in heavy ion collisions in the 1A GeV regime

Author

Reisdorf, W., Stockmeier, M., Andronic, A., Benabderrahmane, M. L., Hartmann, O. N., Herrmann, N., Hildenbrand, K. D., Kim, Y. J., Kis, M., Koczon, P., Kress, T., Leifels, Y., Lopez, X., Merschmeyer, M., Schüttauf, A., Alard, J. P., Barret, V., Basrak, Z., Bastid, N., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, 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-Wilczynska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wisniewski, K., Wohlfarth, D., Xiao, Z., Xu, H. S., Yushmanov, I., and Zhilin, A.

Abstract

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

Published
2007

205. K0 and Λ production in Ni+Ni collisions near threshold

Author

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

Abstract

New results concerning the production of neutral strange particles, K0 and Λ in Ni+Ni collisions at 1.93 AGeV, measured with the FOPI detector at GSI Darmstadt, are presented. Rapidity density distributions and Boltzmann slope parameter distributions are measured in nearly the full phase space of the reaction. The observables are compared to existing K+ and proton data. While the K0 data agree with previously reported K+ measurements, the Λ distributions show a different behavior relative to that of protons. The strangeness balance and the production yield per participating nucleon as a function of the centrality of the reaction are discussed, for the first time at SIS energies.

Published
2007

206. Charged pion production in $^{96}_{44}$Ru+$^{96}_{44}$Ru collisions at 400A and 1528A MeV

Author

Hong, B., Kim, Y.J., Herrmann, N., Stockmeier, M.R., Andronic, A., Barret, V., Basrak, Z., Bastid, N., L. Benabderrahmane, M., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Gobbi, A., Grishkin, Y., N. Hartmann, O., D. Hildenbrand, K., Kecskemeti, J., Kirejczyk, M., Koczon, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Mangiarotti, A., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z.G., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

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

We present transverse momentum and rapidity spectra of charged pions in central Ru + Ru collisions at 400$A$ and 1528$A$ MeV. The data exhibit enhanced production at low transverse momenta compared to the expectations from the thermal model that includes the decay of $\Delta(1232)$-resonances and thermal pions. Modification of the $\Delta$-spectral function and the Coulomb interaction are necessary to describe the detailed shape of the transverse momentum spectra. Within the framework of the thermal model, the freeze-out radii of pions are similar at both beam energies. The IQMD model reproduces the shapes of the transverse momentum and rapidity spectra of pions, but the predicted absolute yields are larger than in the measurements, especially at lower beam energy., Comment: 12 pages, 11 figures

Published
2005
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207. Excitation function of elliptic flow in Au + Au collisions and the nuclear matter equation of state

Author

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

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

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

Published
2005

208. First analysis of anisotropic flow with Lee-Yang zeroes

Author

Bastid, N., Andronic, A., Barret, V., Basrak, Z., Benabderrahmane, M. L., Caplar, R., Cordier, E., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Gasparic, 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., Lopez, X., Mangiarotti, A., Manko, V., Merschmeyer, M., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Reisdorf, W., Schüttauf, A., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolarkiewicz, M. M., Smolyankin, V., Soliwoda, I. J., Stockmeier, M. R., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z., Yushmanov, I., and Zhilin, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

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

Published
2005

209. First measurement of the circular beam asymmetry in the [formula omitted] reaction

Author

Kashevarov, V.L., Fix, A., Aguar-Bartolomé, P., Akasoy, L.K., Annand, J.R.M., Arends, H.J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Codling, R.F.B., Demissie, B.T., Downie, E.J., Drexler, P., Fil'kov, L.V., Glazier, D.I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T.C., Kellie, J.D., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Manley, D.M., Martinez-Fabregate, M., McGeorge, J.C., McNicoll, E.F., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D., Mushkarenkov, A., Nefkens, B.M.K., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P.B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S.N., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M.H., Sober, D., Starostin, A., Stakovsky, I.I., Suarez, I.M., Supek, I., Tarbert, C., Thiel, M., Thomas, A., Unverzagt, M., Watts, D.P., Werthmüller, D., Zamboni, I., and Zehr, F.

Published
2010
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210. Nuclear stopping from 0.09A GeV to 1.93A GeV and its correlation to flow

Author

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

Subjects
Nuclear Experiment
Abstract

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

Published
2004

211. Nuclear stopping from 0.09A to 1.93A GeV and its correlation to flow

Author

Reisdorf, W., Andronic, A., Gobbi, A., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Kim, Y.J., Kirejczyk, M., Koczon, P., Kress, T., Leifels, Y., Schuttauf, A., Tyminski, Z., Xiao, Z.G., Alard, J-P., Barret, V., Basrak, Z., Bastid, N., Benabderrahmane, M.L., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Grishkin, Y., Hong, B., Kecskemeti, J., Korolija, M., Kotte, R., Lebedev, A., Lopez, X., Merschmeyer, M., Mosner, J., Neubert, W., Pelte, D., Petrovici, M., Rami, F., De Schauenburg, B., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
heavy-ion collisions, momentum-dependent interactions, collective flow, microscopic calculation, cross-sections, nonequilibrium, dynamics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

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

Published
2004

212. Shape parameters of the participant source in Ru+Ru collisions at 400 A MeV

Author

Bastid, N., Dupieux, P., Bendarag, A., Barret, V., Crochet, P., Lopez, X., Alard, J-P., Andronic, A., Basrak, Z., Benabderrahmane, M.L., Caplar, R., Cordier, E., Dzelalija, M., Fodor, Z., Gasparic, 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-Wilczynska, K., Smolarkiewicz, M.M., Smolyankin, V., Soliwoda, I.J., Stockmeier, M.R., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z., Yushmanov, I., Zhiling, 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
heavy-ion collisions, flow angle and aspect ratio, in-medium effects, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

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

Published
2004

213. Shape parameters of the participant source in Ru + Ru collisions at 400 AMeV

Author

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

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

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

Published
2004

214. NEW RESULTS IN RARE ALLOWED MUON AND PION DECAYS

Author

POČANIĆ, D., primary, MUNYANGABE, E., additional, BYCHKOV, M., additional, ALONZI, L. P., additional, BARANOV, V. A., additional, BERTL, W., additional, BYSTRITSKY, Yu. M., additional, FRLEŽ, E., additional, KALINNIKOV, V. A., additional, KHOMUTOV, N. V., additional, KORENCHENKO, A. S., additional, KORENCHENKO, S. M., additional, KOROLIJA, M., additional, KOZLOWSKI, T., additional, KRAVCHUK, N. P., additional, KUCHINSKY, N. A., additional, LEHMAN, M. C., additional, MEKTEROVIĆ, D., additional, MZHAVIA, D., additional, PALLADINO, A., additional, ROBMANN, P., additional, ROZHDESTVENSKY, A. M., additional, SUPEK, I., additional, TRUÖL, P., additional, TSAMALAIDZE, Z., additional, VAN DER SCHAAF, A., additional, VANDEVENDER, B., additional, VELICHEVA, E. P., additional, and VOLNYKH, V. P., additional

Published
2014
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215. Sub-threshold phi-meson yield in central 58Ni+58Ni collisions

Author

Mangiarotti, A., Herrmann, N., Maurenzig, P.R., Gobbi, A., Kotte, R., Kecskemeti, J., Leifels, Y., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Dzelalija, M., Finck, C., Fodor, Z., Grishkin, Y., Hartmann, O., Hildenbrand, K.D., Hong, B., Kim, Y.J., Kirejczyk, M., Koczo, P., Korolija, M., Kress, T., Kutsche, R., Lebedev, A., Manko, V., Merschmeyer, M., Moisa, D., Nianine, A., Neubert, W., Pelte, D., Petrovici, M., Plettner, C., Rami, F., Reisdorf, W., De Schauenburg, B., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczy, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanovi, I., Zhilinh, A, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
High Energy Physics::Experiment, heavy ion collision, Sis, sub-threshold meson production, pseudo-vector mesons, phi-meson, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

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

Published
2003

216. 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

217. Model independent extraction of the pole and Breit-Wigner resonance parameters

Author

Ceci, S., Korolija, M., Zauner, B., Ceci, S., Korolija, M., and Zauner, B.

Abstract

We show that a slightly modified Breit-Wigner formula can successfully describe the total cross section even for the broad resonances, from light rho(770) to the heavy Z boson. In addition to mass, width, and branching fraction, we include another resonance parameter that turns out to be directly related to the pole residue phase. The new formula has two mathematically equivalent forms: one with the pole, and the other with the Breit-Wigner parameters., Comment: Final version with corrected typo in Eq. (14); 5 pages, 5 figures, 2 tables

Published
2013
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218. A new determination of the eta transition form factor in the Dalitz decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author

Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Masjuan, P., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Zehr., F., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Masjuan, P., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr., F.

Abstract

The Dalitz decay eta -> e^+ e^- gamma has been measured in the gamma p -> eta p reaction with the Crystal Ball and TAPS multiphoton spectrometers, together with the photon tagging facility at the Mainz Microtron MAMI. The experimental statistic used in this work is one order of magnitude greater than in any previous measurement of eta -> e^+ e^- gamma. The value obtained for the slope parameter 1/Lambda^2 of the eta transition form factor, 1/Lambda^2 = (1.95 +/- 0.15_stat +/- 0.10_syst) [1/GeV^2], is in good agreement with recent measurements conducted in eta -> e^+ e^- gamma and eta -> mu^+ mu^- gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of 1/Lambda^2 is lower compared to results from previous measurements of the eta -> e^+ e^- gamma decay., Comment: 11 pages, 10 figures, 1 table

Published
2013
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219. Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author

Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Mancel, J., Manley, D. M., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Witthauer, L., Zehr., F., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Demissie, B., Dieterle, M., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Mancel, J., Manley, D. M., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Witthauer, L., and Zehr., F.

Abstract

The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. In the present experiment, this reaction was searched for in the 3pi^0 p final state, by assuming K^0_S -> pi^0 pi^0 and Sigma^+ -> pi^0 p. The experimental results include total and differential cross sections as well as the polarization of the recoil hyperon. The new data significantly improve empirical knowledge about the g p -> K^0 Sigma^+ reaction in the measured energy range. The results are compared to previous measurements and model predictions. It is demonstrated that adding the present g p -> K^0 Sigma^+ results to existing data allowed a better description of this reaction with various models., Comment: 12 pages, 10 figures, 4 tables

Published
2013
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220. Narrow Structure in the Excitation Function ofηPhotoproduction off the Neutron

Author

Werthmüller, D., primary, Witthauer, L., additional, Keshelashvili, I., additional, Aguar-Bartolomé, P., additional, Ahrens, J., additional, Annand, J. R. M., additional, Arends, H. J., additional, Bantawa, K., additional, Beck, R., additional, Bekrenev, V., additional, Braghieri, A., additional, Branford, D., additional, Briscoe, W. J., additional, Brudvik, J., additional, Cherepnya, S., additional, Demissie, B., additional, Dieterle, M., additional, Downie, E. J., additional, Drexler, P., additional, Fil’kov, L. V., additional, Fix, A., additional, Glazier, D. I., additional, Hamilton, D., additional, Heid, E., additional, Hornidge, D., additional, Howdle, D., additional, Huber, G. M., additional, Jaegle, I., additional, Jahn, O., additional, Jude, T. C., additional, Käser, A., additional, Kashevarov, V. L., additional, Kondratiev, R., additional, Korolija, M., additional, Kruglov, S. P., additional, Krusche, B., additional, Kulbardis, A., additional, Lisin, V., additional, Livingston, K., additional, MacGregor, I. J. D., additional, Maghrbi, Y., additional, Mancell, J., additional, Manley, D. M., additional, Marinides, Z., additional, Martinez, M., additional, McGeorge, J. C., additional, McNicoll, E. F., additional, Metag, V., additional, Middleton, D. G., additional, Mushkarenkov, A., additional, Nefkens, B. M. K., additional, Nikolaev, A., additional, Novotny, R., additional, Oberle, M., additional, Ostrick, M., additional, Oussena, B., additional, Pedroni, P., additional, Pheron, F., additional, Polonski, A., additional, Prakhov, S. N., additional, Robinson, J., additional, Rosner, G., additional, Rostomyan, T., additional, Schumann, S., additional, Sikora, M. H., additional, Sober, D., additional, Starostin, A., additional, Supek, I., additional, Thiel, M., additional, Thomas, A., additional, Unverzagt, M., additional, and Watts, D. P., additional

Published
2013
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221. Nuclear stopping at SIS energies by using isospin asymmetric nuclear collisions

Author

Andronic, A., Reisdorf, W., Herrmann, N., Crochet, P., Alard, J-P., Barret, V., Basrak, Z., Bastid, N., Berek, G., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Koczon, P., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Petrovici, M., Rami, F., De Schauenburg, B., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanovi, I., Zhilinh, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

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

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

Author

Hong, B., Kim, Y.J., Kang, D., Leifels, Y., Rami, F., De Schauenburg, B., Sim, K.S., Alard, J-P., Andronic, A., Barret, V., Basrak, Z., Bastid, N., Berek, G., Caplar, R., Crochet, P., Devismes, A., Dupieux, P., Delalija, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Kecskemeti, J., Kirejczyk, M., Koczon, P., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lopez, X., Neubert, W., Pelte, D., Petrovici, M., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Stoicea, G., Wagner, P., Winiewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and FOPI

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

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

Author

Wisniewski, K., Crochet, P., Herrmann, N., Andronic, A., Averbeck, R., Devismes, A., Finck, C., Gobbi, A., Hartmann, O., Hildenbrand, K.D., Koczon, P., Kress, T., Kutsche, R., Leifels, Y., Reisdorf, W., Schull, D., Alard, J-P., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Grishkin, Y., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, M., Kotte, R., Kowalczyk, M., Lebedev, A., Lee, K.S., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Plettner, C., Rami, F., de Schauenburg, B., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Smolyankin, V., Somov, A., Stockmeier, M., Stoicea, G., Vasiliev, M., Wagner, P., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, 7. Clean energy, Nuclear physics, Phase space, 0103 physical sciences, Incident beam, Yield ratio, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

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

Published
2001

224. 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

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

Author

Andronic, A., Stoicea, G., Petrovici, M., Simion, V., Crochet, P., Alard, J-P., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Bendarag, A., Berek, G., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Korolija, M., Kotte, R., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Neubert, W., Pelte, D., Plettner, C., Rami, F., Reisdorf, W., de Schauenburg, B., Schuell, D., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M.R., Vasiliev, M.A., Wagner, P., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2001

226. Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz

Author

Kashevarov, V. L., Fix, A., Prakhov, S., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Zehr, F., Kashevarov, V. L., Fix, A., Prakhov, S., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr, F.

Abstract

The gamma p --> pi0 pi0 p reaction has been measured from threshold to 1.4 GeV using the Crystal Ball and TAPS photon spectrometers together with the photon tagging facility at the Mainz Microtron. The experimental results include total and differential cross sections as well as specific angular distributions, which were used to extract partial-wave amplitudes. In particular, the energy region below the D13(1520) resonance was studied., Comment: 12 pages, 13 figures, corrected version, published in PRC

Published
2012
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227. New studies of allowed pion and muon decays

Author

Pocanic, D., Palladino, A., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Lehman, M. C., Mekterovic, D., Munyangabe, E., Mzhavia, D., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truöl, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., Pocanic, D., Palladino, A., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Lehman, M. C., Mekterovic, D., Munyangabe, E., Mzhavia, D., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truöl, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., and Volnykh, V. P.

Abstract

Building on the rare pion and muon decay results of the PIBETA experiment, the PEN collaboration has undertaken a precise measurement of B_{\pi e2} = R^\pi_{e/\mu}, the \pi^+ -> e^+\nu(\gamma) decay branching ratio, at the Paul Scherrer Institute, to reduce the present 40\times experimental precision lag behind theory to ~ 6-7\times. Because of large helicity suppression, R^\pi_{e/\mu} is uniquely sensitive to contributions from non-(V-A) physics, making this decay a particularly suitable subject of study. Even at current precision, the experimental value of B_{\pi e2} provides the most accurate test of lepton universality available. During runs in 2008-10, PEN has accumulated over 2\times 10^7 \pi_{e2} events; a comprehensive maximum-likelihood analysis is currently under way. The new data will also lead to improved precision of the earlier PIBETA results on radiative \pi and \mu decays., Comment: 3 pages, 3 figures, to appear in Proceedings, 11th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2012), held at St. Petersburg, Florida, 29 May - 3 June 2012

Published
2012
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228. Subthreshold $\phi$(1020) meson production in central heavy-ion collisions

Author

Kotte, R., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Crochet, P., Devismes, A., de Schauenburg, B., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Gobbi, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Koczon, P., Kirejczyk, M., Korolija, M., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mosner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Rami, F., Reisdorf, W., Ritman, J., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stockmeier, M.R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Buballa M. Noerenberg W. Schaefer B.J. Wambach J., and FOPI

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

Origins of french Information sciences

Published
2000

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

Author

Devismes, A., Alard, J-P., Andronic, A., Averbeck, R., Barret, V., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Caplar, R., Cindro, N., Crochet, P., de Schauenburg, B., Dupieux, P., Dzelalija, M., Eskef, M., Finck, C., Fodor, Z., Folger, H., Fraysse, L., Genoux-Lubain, A., Gobbi, A., Grigorian, Y., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Koczon, P., Kirejczyk, M., Korolija, M., Kotte, R., Kowalczyk, M., Kress, T., Kutsche, R., Lebedev, A., Lee, K.S., Leifels, Y., Manko, V., Merlitz, H., Mohren, S., Moisa, D., Mosner, J., Neubert, W., Nianine, A., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Rami, F., Reisdorf, W., Ritman, J., Schull, D., Seres, Z., Sikora, B., Sim, K.S., Simion, V., Siwek-Wilczynska, K., Somov, A., Stockmeier, M.R., Stoicea, G., Vasilev, M., Wagner, P., Wisniewski, K., Wohlfarth, D., Yang, J.T., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Buballa M. Noerenberg W. Schaefer B.J. Wambach J., and FOPI

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

230. 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

231. 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

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

Author

Andronic, A., Rami, F., Crochet, P., Dona, R., De Schauenburg, B., Wagner, P., Alard, J-P., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Stoicea, G., Stockmeir, M., Vasilev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and FOPI

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

233. 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

234. 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

235. First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

Author

Kashevarov, V. L., Fix, A., Aguar-Bartolomé, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kellie, J. D., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S. N., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D., Starostin, A., Stakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Zamboni, I., Zehr., F., Kashevarov, V. L., Fix, A., Aguar-Bartolomé, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kellie, J. D., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S. N., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D., Starostin, A., Stakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., Zamboni, I., and Zehr., F.

Abstract

The circular photon asymmetry for pi0 eta photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role of the Delta(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude., Comment: 11 pages, 3 figures, submitted to Phys.Lett. B

Published
2010
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236. Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)

Author

McNicoll, E. F., Prakhov, S., Strakovsky, I. I., Aguar-Bartolomepmainz, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Arndt, R. A., Azimov, Ya. I., Bantawa, K., Beck, R., Bekrenev, V. S., Berghaeuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Freehart, B., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Kellie, J. D., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A. A., Kruglov, S. P., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Marinides, Z., Martinez, M., McGeorge, J. C., McKinnon, B., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Oussena, B., Paris, M. W., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Suarez, I. M., Supek, I., Thiel, M., Thomas, A., Tiator, L., Unverzagt, M., Watts, D. P., Werthmueller, D., Workman, R. L., Zamboni, I., Zehr, F., McNicoll, E. F., Prakhov, S., Strakovsky, I. I., Aguar-Bartolomepmainz, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Arndt, R. A., Azimov, Ya. I., Bantawa, K., Beck, R., Bekrenev, V. S., Berghaeuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Freehart, B., Glazier, D. I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Kellie, J. D., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A. A., Kruglov, S. P., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Marinides, Z., Martinez, M., McGeorge, J. C., McKinnon, B., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Oussena, B., Paris, M. W., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Suarez, I. M., Supek, I., Thiel, M., Thomas, A., Tiator, L., Unverzagt, M., Watts, D. P., Werthmueller, D., Workman, R. L., Zamboni, I., and Zehr, F.

Abstract

The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 =< W >= 1.87 GeV). Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz Microtron MAMI-C and momentum analyzed by the Glasgow Tagging Spectrometer were used for the eta-meson production. Our accumulation of 3.8 x 10^6 gp-->etap-->3pi0p-->6gp events allows a detailed study of the reaction dynamics. The gp-->etap differential cross sections were determined for 120 energy bins and the full range of the production angles. Our data show a dip near W = 1680 MeV in the total cross section caused by a substantial dip in eta production at forward angles. The data are compared to predictions of previous SAID and MAID partial-wave analyses and to thelatest SAID and MAID fits that have included our data., Comment: 15 pages, 12 figures

Published
2010
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237. Radiative pi0 photoproduction on protons in the Delta+(1232) region

Author

Schumann, S., Boillat, B., Downie, E. J., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., Zehr, F., Schumann, S., Boillat, B., Downie, E. J., Aguar-Bartolomé, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Unverzagt, M., Walcher, Th., Watts, D. P., and Zehr, F.

Abstract

The reaction gamma p -> p pi0 gamma' has been measured with the Crystal Ball / TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differential cross sections for the emitted photon gamma' and angular differential cross sections for the pi0 have been determined with high statistics in the energy range of the Delta+(1232) resonance. Cross sections and the ratio of the cross section to the non-radiative process gamma p -> p pi0 are compared to theoretical reaction models, having the anomalous magnetic moment kappa_Delta+ as free parameter. As the shape of the experimental distributions is not reproduced in detail by the model calculations, currently no extraction of kappa_Delta+ is feasible., Comment: 14 pages, 19 figures

Published
2010
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238. Model Independent Extraction of S-Matrix Poles from Experimental Data

Author

Ceci, S., Korolija, M., Zauner, B., Ceci, S., Korolija, M., and Zauner, B.

Abstract

By separating data points close to a resonance into intervals, and fitting all possible intervals to a simple pole with constant coherently added background, we obtained a substantial number of convergent fits. After a carefully chosen set of statistical constraints was imposed, we calculated the average of a resonance pole position from the statistically acceptable results. We used this method to find pole positions of Z and N(1440) resonances, and to show that the strong discrepancy between the old and new measurements of the Upsilon(11020) mass stems from specious comparison of the Upsilon(11020) pole with its Breit-Wigner mass., Comment: 4 pages, 3 figures

Published
2010

239. Systematics of central heavy ion collisions in the 1A GeV 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., 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., Zhilin, A., 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.

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.

Published
2010

240. PEN experiment: a precise measurement of the pi+ -> e+ nu decay branching fraction

Author

PEN Collaboration, Pocanic, D., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterovic, D., Mzhavia, D., Palladino, A., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truoel, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., PEN Collaboration, Pocanic, D., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterovic, D., Mzhavia, D., Palladino, A., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truoel, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., and Volnykh, V. P.

Abstract

A new measurement of $B_{\pi e2}$, the $\pi^+ \to e^+\nu(\gamma)$ decay branching ratio, is currently under way at the Paul Scherrer Institute. The present experimental result on $B_{\pi e2}$ constitutes the most accurate test of lepton universality available. The accuracy, however, still lags behind the theoretical precision by over an order of magnitude. Because of the large helicity suppression of the $\pi_{e2}$ decay, its branching ratio is susceptible to significant contributions from new physics, making this decay a particularly suitable subject of study., Comment: 4 pages, 3 figures, talk given at the Tenth Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2009), La Jolla/San Diego, CA, 26-31 May 2009; to appear in Proceedings to be published by the American Institute of Physics

Published
2009
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241. PEN: a sensitive search for non-(V-A) weak processes

Author

PEN Collaboration, Pocanic, D., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterovic, D., Mzhavia, D., Palladino, A., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truoel, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., PEN Collaboration, Pocanic, D., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Frlez, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterovic, D., Mzhavia, D., Palladino, A., Robmann, P., Rozhdestvensky, A. M., Shkarovskiy, S. N., Straumann, U., Supek, I., Truoel, P., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., and Volnykh, V. P.

Abstract

A new measurement of $B_{\pi e2}$, the $\pi^+ \to e^+\nu(\gamma)$ decay branching ratio, is currently under way at the Paul Scherrer Institute. The present experimental result on $B_{\pi e2}$ constitutes the most accurate test of lepton universality available. The accuracy, however, still lags behind the theoretical precision by over an order of magnitude. Thanks to the large helicity suppression of $\pi_{e2}$ decay, the branching ratio is susceptible to significant contributions from new physics, making this decay a particularly suitable subject of study., Comment: 4 pages, 1 figure, talk given at the 18th International Conference on Particles and Nuclei (PANIC08), held 9 -14 November 2008 in Eilat, Israel; to appear in the Proceedings published by North Holland

Published
2009

242. Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance

Author

Kashevarov, V. L., Fix, A., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Prakhov, S. N., Rosner, G., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., Zehr, F., Kashevarov, V. L., Fix, A., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ostrick, M., Owens, R. O., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Prakhov, S. N., Rosner, G., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., and Zehr, F.

Abstract

Total and differential cross sections for the reaction gamma p -> pi^o eta p have been measured with the Crystal Ball/TAPS detector using the tagged photon facility at the MAMI C accelerator in Mainz. In the energy range E_gamma=0.95-1.4 GeV the reaction is dominated by the excitation and sequential decay of the Delta(1700)D33 resonance. Angular distributions measured with high statistics allow us to determine the ratio of hadronic decay widths \Gamma_{\eta \Delta}/\Gamma_{\pi S11} and the ratio of the helicity amplitudes A_{3/2}/A_{1/2} for this resonance., Comment: 9 pages, 11 figures

Published
2009
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243. Determination of the Dalitz plot parameter alpha for the decay eta->3pi^0 with the Crystal Ball at MAMI-B

Author

Unverzagt, M., Aguar-Bartolome, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Downie, E. J., Filkov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Walcher, Th., Watts, D. P., Zehr, F., Unverzagt, M., Aguar-Bartolome, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J. W., Cherepnya, S., Codling, R., Downie, E. J., Filkov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V. L., Kondratiev, R., Korolija, M., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I. J. D., Manley, D. M., Martinez-Fabregate, M., McGeorge, J. C., Mekterovic, D., Metag, V., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Owens, R. O., Pedroni, P., Polonski, A., Prakhov, S. N., Price, J. W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C. M., Thomas, A., Walcher, Th., Watts, D. P., and Zehr, F.

Abstract

A precise measurement of the Dalitz plot parameter, alpha, for the eta->3pi^0 decay is presented. The experiment was performed with the Crystal Ball and TAPS large acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8*10^6 eta->3pi^0 events were obtained, giving the result alpha = -0.032 +/- 0.002(stat) +/- 0.002(syst)., Comment: 9 pages, 6 figures, published in the online-first section of EPJ A, included changes referees asked for, added DOI

Published
2008
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244. Precise Measurement of pi+ -> e+ nu Branching Ratio

Author

Frlež, E., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterović, D., Mzhavia, D., Palladino, A., Počanić, D., Robmann, P., Rozhdestvensky, A. M., Sidorkin, V. V., Straumann, U., Supek, I., Truöl, P., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., Frlež, E., Alonzi, L. P., Baranov, V. A., Bertl, W., Bychkov, M., Bystritsky, Yu. M., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Mekterović, D., Mzhavia, D., Palladino, A., Počanić, D., Robmann, P., Rozhdestvensky, A. M., Sidorkin, V. V., Straumann, U., Supek, I., Truöl, P., van der Schaaf, A., Velicheva, E. P., and Volnykh, V. P.

Abstract

The PEN Collaboration is conducting a new measurement of the pi+ -> e+ nu branching ratio at the Paul Scherrer Institute, with the goal uncertainty of delta B/B(pie2)=5E-4 or lower. At present, the combined accuracy of all published pie2 decay measurements lags behind the theoretical calculation by a factor of 40. In this contribution we report on the PEN detector configuration and its performance during two development runs done in 2007 and 2008., Comment: pdflatex, 11 pages, 5 figures, to be published in "Progress in High-Energy Physics and Nuclear Safety", NATO Science for Peace Series: B - Physics and Biophysics

Published
2008
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245. Measurement of the Slope Parameter $\alpha$ for the $\eta\to 3\pi^0$ decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C)

Author

Prakhov, S., Nefkens, B. M. K., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Kellie, J. D., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Krambrich, D., Kruglov, S., Krusche, B., Lang, M., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., Zehr, F., Prakhov, S., Nefkens, B. M. K., Aguar-Bartolome, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Downie, E. J., Drexler, P., Fil'kov, L. V., Glazier, D. I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Kellie, J. D., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Krambrich, D., Kruglov, S., Krusche, B., Lang, M., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Martinez, M., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Micanovic, S., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P. B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Zamboni, I., and Zehr, F.

Abstract

The dynamics of the $\eta\to 3\pi^0$ decay have been studied with the Crystal Ball multiphoton spectrometer and the TAPS calorimeter. Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for $\eta$-meson production. The analysis of $3 \times 10^6$ $\gamma p \to \eta p \to 3\pi^0 p \to 6\gamma p$ events yields the value $\alpha=-0.032\pm0.003$ for the $\eta\to 3\pi^0$ slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The $\pi^0\pi^0$ invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the $\pi^+\pi^-$ threshold. The observed effect is small and does not affect our measured value for the slope parameter.

Published
2008
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246. New Precise Measurement of the Pion Weak Form Factors in the Pi+ -> e+ nu gamma Decay

Author

Bychkov, M., Počanić, D., VanDevender, B. A., Baranov, V. A., Bertl, W., Bystritsky, Yu. M., Frlež, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Li, W., Mekterović, D., Mzhavia, D., Ritt, S., Robmann, P., Rondon-Aramayo, O. A., Rozhdestvensky, A. M., Sakhelashvili, T., Scheu, S., Straumann, U., Supek, I., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., Wang, Y., Wirtz, H. -P., Bychkov, M., Počanić, D., VanDevender, B. A., Baranov, V. A., Bertl, W., Bystritsky, Yu. M., Frlež, E., Kalinnikov, V. A., Khomutov, N. V., Korenchenko, A. S., Korenchenko, S. M., Korolija, M., Kozlowski, T., Kravchuk, N. P., Kuchinsky, N. A., Li, W., Mekterović, D., Mzhavia, D., Ritt, S., Robmann, P., Rondon-Aramayo, O. A., Rozhdestvensky, A. M., Sakhelashvili, T., Scheu, S., Straumann, U., Supek, I., Tsamalaidze, Z., van der Schaaf, A., Velicheva, E. P., Volnykh, V. P., Wang, Y., and Wirtz, H. -P.

Abstract

We have measured the $\pi^+\to {\rm e}^+\nu\gamma$ branching ratio over a wide region of phase space, based on a total of 65,460 events acquired using the PIBETA detector. Minimum-$\chi^2$ fits to the measured $(E_{e^+},E_\gamma)$ energy distributions result in the weak form factor value of $F_A=0.0119(1)$ with a fixed value of $F_V=0.0259$. An unconstrained fit yields $F_V=0.0258(17)$ and $F_A=0.0117(17)$. In addition, we have measured $a=0.10(6)$ for the dependence of $F_V$ on $q^2$, the ${\rm e}^{+}\nu$ pair invariant mass squared, parametrized as $F_V(q^2)=F_V(0)(1+a\cdot q^2)$. The branching ratio for the kinematic region $E_\gamma > 10 $MeV and $\theta_{{\rm e^+}\gamma} > 40^\circ $ is measured to be $B^{\rm exp}=73.86(54) \times 10^{-8}$. Earlier deviations we reported in the high-$E_\gamma$/low-$E_{{\rm e}^+}$ kinematic region are resolved, and we find full compatibility with CVC and standard $V$$-$$A$ calculations without a tensor term. We also derive new values for the pion polarizability, $\alpha_E = \rm 2.78(10) \times 10^{-4} fm^3$, and neutral pion lifetime, $\tau_{\pi 0} = (8.5 \pm 1.1) \times 10^{-17} $s., Comment: 4 pages, 2 PDF figures

Published
2008
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247. Strangeness and in-medium effects in heavy ion collisions from 1 to 2 AGeV

Author

Crochet, P., Andronic, A., Rami, F., Dona, R., De Schauenburg, B., Wagner, P., Alard, J-P., Basrak, Z., Bastid, N., Belyaev, I., Bendarag, A., Berek, G., Best, D., Caplar, R., Devismes, A., Dupieux, P., Dzelalija, M., Eskef, M., Fodor, Z., Gobbi, A., Grishkin, Y., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kirejczyk, M., Korolija, M., Kotte, R., Lebedev, A., Leifels, Y., Merlitz, H., Mohren, S., Moisa, D., Neubert, W., Pelte, D., Petrovici, M., Pinkenburg, C., Plettner, C., Reisdorf, W., Schull, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Stoicea, G., Stockmeir, M., Vasilev, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and FOPI

Subjects
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1998

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

Author

Hong, B., Herrmann, N., Ritman, J.L., Best, D., Gobbi, A., Hildenbrand, K.D., Kirejczyk, M., Leifels, Y., Pinkenburg, C., Reisdorf, W., Schull, D., Sodan, U., Wang, G.S., Wienold, T., Alard, J-P., Amouroux, V., Bastid, N., Belyaev, I., Berek, G., Biegansky, J., Buta, A., Coffin, J.P., Crochet, P., Dona, R., Dupieux, P., Eskef, M., Fintz, P., Fodor, Z., Fraysse, L., Genoux-Lubain, A., Goebels, G., Guillaume, G., Hafele, E., Jundt, F., Kecskemeti, J., Korolija, M., Kotte, R., Kuhn, C., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mosner, J., Mohren, S., Neubert, W., Pelte, D., Petrovici, M., Pras, P., Rami, F., Roy, C., Seres, Z., Sikora, B., Simion, V., Siwek-Wilczynska, K., Somov, A., Tizniti, L., Trzaska, M., Vasilev, M.A., Wagner, P., Wohlfarth, D., Zhilin, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), FOPI, and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
1998

250. Measurement of theγp→K0Σ+reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron

Author

Aguar-Bartolomé, P., primary, Annand, J. R. M., additional, Arends, H. J., additional, Bantawa, K., additional, Beck, R., additional, Bekrenev, V., additional, Berghäuser, H., additional, Braghieri, A., additional, Briscoe, W. J., additional, Brudvik, J., additional, Cherepnya, S., additional, Codling, R. F. B., additional, Collicott, C., additional, Demissie, B., additional, Dieterle, M., additional, Downie, E. J., additional, Drexler, P., additional, Fil'kov, L. V., additional, Fix, A., additional, Glazier, D. I., additional, Gregor, R., additional, Hamilton, D., additional, Heid, E., additional, Hornidge, D., additional, Howdle, D., additional, Isaksson, L., additional, Jaegle, I., additional, Jahn, O., additional, Jude, T. C., additional, Kashevarov, V. L., additional, Keshelashvili, I., additional, Kondratiev, R., additional, Korolija, M., additional, Kotulla, M., additional, Koulbardis, A., additional, Kruglov, S., additional, Krusche, B., additional, Lisin, V., additional, Livingston, K., additional, MacGregor, I. J. D., additional, Maghrbi, Y., additional, Mancel, J., additional, Manley, D. M., additional, McNicoll, E. F., additional, Mekterovic, D., additional, Metag, V., additional, Mushkarenkov, A., additional, Nefkens, B. M. K., additional, Nikolaev, A., additional, Novotny, R., additional, Oberle, M., additional, Ortega, H., additional, Ostrick, M., additional, Ott, P., additional, Otte, P. B., additional, Oussena, B., additional, Pedroni, P., additional, Pheron, F., additional, Polonski, A., additional, Prakhov, S., additional, Robinson, J., additional, Rosner, G., additional, Rostomyan, T., additional, Schumann, S., additional, Sikora, M. H., additional, Sober, D. I., additional, Starostin, A., additional, Strakovsky, I. I., additional, Suarez, I. M., additional, Supek, I., additional, Tarbert, C. M., additional, Thiel, M., additional, Thomas, A., additional, Unverzagt, M., additional, Watts, D. P., additional, Werthmüller, D., additional, Witthauer, L., additional, and Zehr, F., additional

Published
2013
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