Author: "T. Wienold" / Topic: nuclear experiment - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"T. Wienold"' showing total 81 results

Start Over Author "T. Wienold" Topic nuclear experiment

81 results on '"T. Wienold"'

1. Triangular flow of negative pions emitted in PbAu collisions at sNN=17.3 GeV

Author: I. Ravinovich, D. Antończyk, Michal Sumbera, G. Agakichiev, Iu. Karpenko, Peter Glassel, S. Damjanovic, Axel Maas, J. Holeczek, D. Miśkowiec, G. Tsiledakis, L. Dietrich, Pavel Rehak, G. Hering, V. Kushpil, S. Yurevich, J. Rak, Jovan Milosevic, H. Tilsner, M. Kalisky, Johanna Stachel, Thomas Dietel, J. Bielcikova, S. Shimansky, Dagmar Adamová, Oliver Busch, Hiroyuki Sako, W. Schmitz, S. I. Esumi, O. Petchenova, S. Sedykh, V. Petracek, S. Schuchmann, A. Drees, G. Krobath, Peter Braun-Munzinger, K. Fomenko, K. Filimonov, Ana Maria Marin, V. V. Belaga, A. Cherlin, I. Tserruya, T. Wienold, V. I. Yurevich, S. Radomski, Anton Andronic, Z. Fraenkel, W. Dubitzky, C. Garabatos, H. Appelshäuser, Y. Panebrattsev, J.P. Wurm, and Johannes Peter Wessels
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 01 natural sciences, Nuclear physics, Angular distribution, Pion, Cascade, 0103 physical sciences, Transverse momentum, Heavy ion, Multiplicity (chemistry), Impact parameter, Nuclear Experiment, 010306 general physics
Abstract: Differential triangular flow, v 3 ( p T ) , of negative pions is measured at s NN = 17.3 GeV around midrapidity by the CERES/NA45 experiment at CERN in central PbAu collisions in the range 0–30% with a mean centrality of 5.5%. This is the first measurement as a function of transverse momentum of the triangular flow at SPS energies. The p T range extends from about 0.05 GeV/ c to more than 2 GeV/ c . The triangular flow magnitude, corrected for the HBT effects, is smaller by a factor of about 2 than the one measured by the PHENIX experiment at RHIC and the ALICE experiment at the LHC. Within the analyzed range of central collisions no significant centrality dependence is observed. The data are found to be well described by a viscous hydrodynamic calculation combined with an UrQMD cascade model for the late stages.
Published: 2017
Full Text: View/download PDF

2. Scale-dependence of transverse momentum correlations in Pb Au collisions at 158A GeV/c

Author: Peter Glassel, Jovan Milosevic, V. I. Yurevich, J. Holeczek, V. Petracek, Y. Panebrattsev, J.P. Wurm, S. Damjanovic, D. Miśkowiec, Dagmar Adamová, Andreas Pfeiffer, S. Sedykh, S. Yurevich, G. Agakichiev, Axel Maas, Ana Maria Marin, D. Antonczyk, V. Kushpil, Johanna Stachel, Oliver Busch, Alexander Milov, J. Rak, Z. Fraenkel, K. Filimonov, Mateusz Andrzej Ploskon, A. Cherlin, S. Radomski, W. Dubitzky, S. Shimansky, C. Garabatos, H. Tilsner, H. Appelshäuser, L. Dietrich, Pavel Rehak, O. Petchenova, I. Tserruya, T. Wienold, I. Ravinovich, W. Schmitz, Michal Sumbera, V. V. Belaga, S. Bielcikova, G. Tsiledakis, T. Dietel, Wei Xie, A. Drees, Johannes Peter Wessels, S. I. Esumi, Peter Braun-Munzinger, K. Fomenko, and Hiroyuki Sako
Subjects: Physics, Momentum, Nuclear physics, Baryon, Nuclear and High Energy Physics, Pair production, Elliptic flow, Hadron, Nuclear Experiment, Nucleon, Super Proton Synchrotron, Charged particle
Abstract: We present results on transverse momentum correlations of charged particle pairs produced in Pb Au collisions at 158 A GeV / c at the Super Proton Synchrotron. The transverse momentum correlations have been studied as a function of collision centrality, angular separation of the particle pairs, transverse momentum and charge sign. We demonstrate that the results are in agreement with previous findings in scale-independent analyses at the same beam energy. Employing the two-particle momentum correlator 〈 Δ p t , i , Δ p t , j 〉 and the cumulative p t variable x ( p t ) , we identify, using the scale-dependent approach presented in this paper, different sources contributing to the measured correlations, such as quantum and Coulomb correlations, elliptic flow and mini-jet fragmentation.
Published: 2008
Full Text: View/download PDF

3. Modification of the ρ meson detected by low-mass electron–positron pairs in central Pb Au collisions at 158A GeV/c

Author: Z. Fraenkel, J. Rak, L. Dietrich, Pavel Rehak, Alexander Milov, O. Petchenova, S. Shimansky, Michal Sumbera, Jovan Milosevic, I. Tserruya, K. Fomenko, J. Holeczek, V. I. Yurevich, Axel Maas, S. Sedykh, S. Damjanović, V. Petracek, A. Drees, Peter Braun-Munzinger, Dagmar Adamová, T. Wienold, H. Tilsner, G. Agakichiev, S. I. Esumi, Johannes Peter Wessels, A. Cherlin, D. Miskowiec, Oliver Busch, D. Antonczyk, Andreas Pfeiffer, K. Filimonov, S. Yurevich, Wei Xie, Peter Glassel, T. Dietel, W. Dubitzky, C. Garabatos, H. Appelshäuser, V. V. Belaga, H. Sako, I. Ravinovich, V. Kushpil, Ana Maria Marin, Y. Panebrattsev, J.P. Wurm, Johanna Stachel, J. Bielcikova, and W. Schmitz
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Rho meson, Meson, Nuclear Theory, Hadron, FOS: Physical sciences, Nuclear physics, Baryon, Pair production, Positron, Antimatter, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Lepton
Abstract: We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $\rho$ spectral function over a density-dependent shift of the $\rho$ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $\rho$-meson in the hot fireball at SPS energy., Comment: Revised version
Published: 2008
Full Text: View/download PDF

4. Latest results on pair production in CERES

Author: S. Radomski, V. Kushpil, W. Seipp, S. I. Esumi, D. Miśkowiec, J. Rak, Axel Maas, W. Schmitz, S. Yurevich, D. Antonczyk, R. Ortega, Michal Sumbera, G. Agakichiev, I. Ravinovich, A. Drees, H. Tilsner, G. Krobath, H. Sako, Z. Fraenkel, Jovan Milosevic, S. Damjanović, G. Tsiledakis, Johannes Peter Wessels, L. Dietrich, C. Garabatos, T. Wienold, Pavel Rehak, Oliver Busch, S. Sedykh, H. Appelshäuser, R. Campagnolo, K. Fomenko, Peter Glassel, V. Petracek, W. Ludolphs, I. Tserruya, Anton Andronic, Ana Maria Marin, K. Filimonov, J. Bielcikova, Peter Braun-Munzinger, Bernd Stefan Windelband, Luciano Musa, V. I. Yurevich, Jurgen Schukraft, O. Petchenova, A. Cherlin, Y. Panebrattsev, Dagmar Adamová, J.P. Wurm, V. Belaga, S. Shimansky, Johanna Stachel, T. Dietel, J. Holeczek, and G. Hering
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron pair, Large Hadron Collider, Meson, Physics::Instrumentation and Detectors, Nuclear Theory, Hadron, Elementary particle, Quarkonium, Nuclear physics, Particle decay, Pair production, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Recent results of the CERES experiment at the CERN SPS on low-mass electron pair analysis and ϕ → K + K − are discussed and compared to models.
Published: 2005
Full Text: View/download PDF

5. Low-mass lepton pair production in Pb-Au collisions at 40 A.GeV

Author: T. Dietel, K. Fomenko, C. Garabatos, S. I. Esumi, Axel Maas, Bernd Stefan Windelband, H. Tilsner, Wei Xie, H. J. Specht, D. Miśkowiec, A. Drees, Peter Glassel, I. Tserruya, J. Holeczek, H. Sako, M. Richter, G. Hering, Johanna Stachel, Johannes Peter Wessels, Z. Fraenkel, Jan Rak, S. Sedykh, A. Cherlin, Jurgen Schukraft, B. Lenkeit, V. I. Yurevich, S. Shimansky, S. Damjanović, Y. Panebrattsev, W. Schmitz, T. Wienold, J.P. Wurm, Alexander Milov, L. Dietrich, Pavel Rehak, Dagmar Adamová, Michal Sumbera, S. Yurevich, Jovan Milosevic, V. Belaga, J. Slívová, V. Petracek, W. Seipp, I. Ravinovich, G. Agakichiev, K. Filimonov, A. Pfeiffer, Peter Braun-Munzinger, Ana Maria Marin, O. Petchenova, V. Kushpil, and H. Appelshäuser
Subjects: Hadronic decay, Physics, Phase transition, Chiral symmetry, Particle physics, Annihilation, Large Hadron Collider, General Physics and Astronomy, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Low Mass, Lepton
Abstract: The CERES/NA45 experiment at the CERN SPS has previously measurede e pair production in 160 A GeV Pb-Au collisions. In the mass region m 0 2G eV/c 2 , an enhancement of 2 7 0 4(stat.) 0 5(syst.) compared to the expectation from known hadronic decay sources was observed. In the 40 A GeV data taken in 1999, an enhancement is again found; a preliminary anal- ysis gives an even larger value of 5 0 1 3(stat.). The results are compared to theoretical model calculations based on π π annihilation with a modified ρ-propagator; they may be related to chiral symmetry restoration.
Published: 2003
Full Text: View/download PDF

6. Lambda production in 40 A GeV/c Pb$ndash$Au collisions

Author: W Schmitz for the CERES Collaboration, D Adamov$aacute$, G Agakichiev, H Appelsh$auml$user, V Belaga, P Braun-Munzinger, A Cherlin, S Damjanovi$cacute$, T Dietel, L Dietrich, A Drees, S I Esumi, K Filimonov, K Fomenko, Z Fraenkel, C Garabatos, P Gl$auml$ssel, G Hering, V Kushpil, B Lenkeit, A Maas, A Mar$iacute$n, F Messer, J Milosevi$cacute$, A Milov, D Miskowiec, Yu Panebrattsev, O Petchenova, V Petr$aacute$cek, A Pfeiffer, J Rak, I Ravinovich, P Rehak, H Sako, W Schmitz, J Schukraft, S Sedykh, S Shimansky, J Sl$iacute$vov$aacute$, H J Specht, J Stachel, M Sumbera, H Tilsner, I Tserruya, J P Wessels, T Wienold, J P Wurm, W Xie, S Yurevich, and V Yurevich
Subjects: Momentum, Nuclear physics, Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Hadron, Physics::Accelerator Physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, Lambda, Beam (structure)
Abstract: During the 1999 lead run, CERES has measured hadron and electron-pair production at 40 A GeV/c beam momentum with the spectrometer upgraded by the addition of a radial TPC. Here the analysis of lambda and antilambda will be presented.
Published: 2002
Full Text: View/download PDF

7. Neutral strange particle dynamics in Au $plus$ Au collisions at AGS energies

Author: P Chung for the E895 Collaboration, J M Alexander, N N Ajitanand, M Anderson, D Best, F P Brady, T Case, W Caskey, D Cebra, J L Chance, P Chung, B Cole, K Crowe, A C Das, J E Draper, M L Gilkes, S Gushue, M Heffner, A S Hirsch, E L Hjort, L Huo, M Justice, M Kaplan, D Keane, J C Kintner, J Klay, D Krofcheck, Roy A Lacey, J Lauret, M A Lisa, H Liu, Y M Liu, R McGrath, Z Milosevich, G Odyniec, D L Olson, S Panitkin, C Pinkenburg, N T Porile, G Rai, H G Ritter, J L Romero, R Scharenberg, L Schroeder, B Srivastava, N T B Stone, T J M Symons, J Whitfield, T Wienold, R Witt, L Wood, and W N Zhang
Subjects: Physics, Nuclear and High Energy Physics, Strange quark, Space time, Gaussian, Dynamics (mechanics), Magnitude (mathematics), Scattering length, Radius, Nuclear physics, symbols.namesake, Pion, symbols, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract: The E895 Collaboration has investigated a number of mixed-particle correlations involving neutral strange particles (K0s and Λ) in 2, 4, 6 and 8 A GeV Au + Au collisions at the AGS. The first measurements for pΛ correlations indicate a correlation magnitude of about 50% with a 26 MeV width. Detailed comparisons between data and theory suggest an emitting source with an effective Gaussian radius close to 4.5 fm. This radius is much larger than the value of 2.8 fm predicted by the relativistic transport code ART. Pairs of pK0, π−Λ and π−K0 are found to display essentially zero correlation at 6 A GeV. The latter observations are not unexpected considering that the proton–K0 interaction has a very small scattering length and there are no very well known interactions between pions and Λs or K0s.
Published: 2002
Full Text: View/download PDF

8. Directed Flow ofΛHyperons in(2–6)AGeVAu+AuCollisions

Author: M. A. Lisa, S. Y. Panitkin, N. T. B. Stone, H. G. Ritter, L. S. Schroeder, D. Best, David Krofcheck, E. Hjort, T. Wienold, T. Case, D. Keane, P. Chung, N. N. Ajitanand, G. Rai, J. L. Chance, Morton Kaplan, D. Cebra, F. P. Brady, G. Odyniec, S. Gushue, J. Whitfield, Y. M. Liu, Z. Milosevich, R. Witt, M. L. Gilkes, B. K. Srivastava, T. J. M. Symons, J. L. Romero, L. Wood, Brian Cole, Matthew J. Anderson, N. T. Porile, R. P. Scharenberg, J. Lauret, R. L. McGrath, J. M. Alexander, A. C. Das, H. Liu, J. L. Klay, Roy A. Lacey, M. Heffner, A. S. Hirsch, J. E. Draper, W. N. Zhang, M. Justice, Kenneth M. Crowe, D. L. Olson, W. Caskey, J. C. Kintner, Lei Huo, and C. Pinkenburg
Subjects: Nuclear reaction, Physics, Nuclear Theory, Hadron, Hyperon, General Physics and Astronomy, Elementary particle, Lambda baryon, Lambda, Baryon, Nuclear physics, Atomic physics, Nuclear Experiment, Nucleon
Abstract: Directed flow measurements for {Lambda} hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2A, 4A, and 6AGeV; b
Published: 2001
Full Text: View/download PDF

9. Sideward Flow inAu+AuCollisions between2Aand8AGeV

Author: H. Liu, N. N. Ajitanand, J. Alexander, M. Anderson, D. Best, F. P. Brady, T. Case, W. Caskey, D. Cebra, J. Chance, B. Cole, K. Crowe, A. Das, J. Draper, M. Gilkes, S. Gushue, M. Heffner, A. Hirsch, E. Hjort, L. Huo, M. Justice, M. Kaplan, D. Keane, J. Kintner, J. Klay, D. Krofcheck, R. Lacey, M. A. Lisa, Y. M. Liu, R. McGrath, Z. Milosevich, G. Odyniec, D. Olson, S. Y. Panitkin, N. Porile, G. Rai, H. G. Ritter, J. Romero, R. Scharenberg, L. S. Schroeder, B. Srivastava, N. T. B. Stone, T. J. M. Symons, S. Wang, J. Whitfield, T. Wienold, R. Witt, L. Wood, X. Yang, W. N. Zhang, and Y. Zhang
Subjects: Physics, Azimuth, Nuclear physics, Range (particle radiation), Time projection chamber, Flow (mathematics), Orientation (geometry), General Physics and Astronomy, Nuclear Experiment, Anisotropy, Fourier series, Beam (structure)
Abstract: Using the large acceptance Time Projection Chamber of experiment E895 at Brookhaven, measurements of collective sideward flow in Au+Au collisions at beam energies of 2A, 4A, 6A, and 8A GeV are presented in the form of in-plane transverse momentum and the first Fourier coefficient of azimuthal anisotropy v(1). These measurements indicate a smooth variation of sideward flow as a function of beam energy. The data are compared with four nuclear transport models which have an orientation towards this energy range. All four exhibit some qualitative trends similar to those found in the data, although none show a consistent pattern of agreement within experimental uncertainties.
Published: 2000
Full Text: View/download PDF

10. Bombarding Energy Dependence ofπ−Interferometry at the Brookhaven AGS

Author: G. Odyniec, S. Gushue, E. Hjort, D. Best, T. Case, W. N. Zhang, T. J. M. Symons, J. L. Romero, H. G. Ritter, R. P. Scharenberg, David Krofcheck, Y. M. Liu, J. L. Chance, Kenneth M. Crowe, M. L. Gilkes, D. Cebra, A. C. Das, H. Liu, Brian Cole, Matthew J. Anderson, J. L. Klay, Roy A. Lacey, F. P. Brady, J. E. Draper, M. Heffner, J. Whitfield, D. Keane, P. Chung, A. S. Hirsch, J. Lauret, N. N. Ajitanand, M. A. Lisa, J. C. Kintner, G. Rai, S. Y. Panitkin, Russell Wells, J. M. Alexander, R. Witt, L. Wood, B. K. Srivastava, D. L. Olson, W. Caskey, N. T. B. Stone, M. Justice, N. T. Porile, R. L. McGrath, L. S. Schroeder, Lei Huo, C. Pinkenburg, Z. Milosevich, T. Wienold, and Morton Kaplan
Subjects: Physics, Nuclear physics, Excitation function, Mean field theory, Reaction dynamics, General Physics and Astronomy, Alternating Gradient Synchrotron, Sensitivity (control systems), Atomic physics, Nuclear Experiment, Nuclear matter, Intensity (heat transfer), Energy (signal processing)
Abstract: We present the first excitation function of ${\ensuremath{\pi}}^{\ensuremath{-}}$ intensity interferometry at Alternating Gradient Synchrotron (AGS) energies (2--8 A GeV). The sensitivity of the multidimensional correlation functions to the geometry and dynamics of the pion-emitting system provides a stringent test of transport models of heavy ion collisions. Detailed comparisons with a realistic transport model, both with and without an explicit nuclear mean field, suggest that the beam energy evolution in the reaction dynamics is different in the model than in the data. A significantly increased ${\ensuremath{\pi}}^{\ensuremath{-}}$ emission time scale, which has been suggested as a signal of the onset of the transition to quark-gluon plasma, is not observed.
Published: 2000
Full Text: View/download PDF

11. Results from the experiment E895 at the BNL AGS

Author: N. T. Porile, M. A. Lisa, P. Chung, J. L. Romero, S. Y. Panitkin, D. Keane, N T B Stone, Y. M. Liu, G. Rai, Yufeng Zhang, S. Gushue, K. Crowe, R. P. Scharenberg, N.N. Ajitanand, T. Case, J. Klay, Brian Cole, G. Odyniec, D. Best, D. L. Olson, R. L. McGrath, T. Wienold, Morton Kaplan, J. L. Chance, R. Lacey, David Krofcheck, M. Heffner, D. Cebra, J. C. Kintner, C. Pinkenburg, J. Whitfield, L. Wood, W. Caskey, Z. Milosevich, James Alexander, T. J. M. Symons, E. L. Hjort, X. Yang, L. S. Schroeder, Andrew S. Hirsch, M. Anderson, R. Witt, M. Justice, W. N. Zhang, M.L. Gilkes, Hans Georg Ritter, S. Wang, F. P. Brady, B. K. Srivastava, L. Huo, R. Wells, A. C. Das, H. Liu, and J. E. Draper
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Physics::Instrumentation and Detectors, Detector, Observable, Context (language use), Particle identification, Nuclear physics, Nuclear Experiment, Event (particle physics), Beam (structure), Excitation
Abstract: We present some of the latest results from the E895 experiment conducted at the BNL AGS accelerator. Au+Au collisions were recorded by the EOS Time Projection Chamber (TPC) at beam energies of 2, 4, 6, and 8 A GeV. The TPC detector permitted the reconstruction of individual collision events with almost 4π acceptance and good particle identification. This capability allowed E895 to study global observables and two particle correlations with respect to symmetries of the event. Flow excitation functions are examined and discussed in the context of the Nuclear Equation of State.
Published: 1999
Full Text: View/download PDF

12. First results from the CERES radial TPC

Author: W. Seipp, Johanna Stachel, M. Hausmann, Z. Fraenkel, V. I. Yurevich, S. Esumi, H. Tilsner, G. Agakichiev, S. Razin, Peter Glassel, Y. Panebrattsev, J.P. Wurm, Thomas Dietel, Pavel Rehak, Ana Maria Marin, Johannes Peter Wessels, P. Ernst, A. Pfeiffer, P. Holl, M. Messer, I. Ravinovich, P. Stiller, M. Richter, E. Schäfer, Jurgen Schukraft, Bernd Stefan Windelband, Michal Sumbera, Dariusz Czeslaw Miskowiec, C. Garabatos, J. Slivova, V. Hanzal, C. Voigt, R. Bell, N. Saveljic, A. Cherlin, H. Appelshäuser, Wei Xie, G. Hering, Peter Braun-Munzinger, A. Drees, H. J. Specht, V. Kushpil, A. Gnaenski, S. Shimansky, R. Baur, F. Ceretto, T. Wienold, V. Petráček, V. Belaga, W. Schmitz, E. Socol, I. Hrivnacova, Archana Sharma, J. Rak, B. Lenkeit, K. Filimonov, S. Damjanovic, I. Tserruya, Alexander Milov, and S. Voloshin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Large Hadron Collider, Muon, Proton, Physics::Instrumentation and Detectors, Laser, law.invention, Beam halo, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The CERES/NA45 experiment at the CERN SPS was upgraded in 1998 by the addition of a cylindrical Time Projection Chamber. The aim is to improve the mass resolution of e+e− pairs in the ρ/ω/φ region to Δm/m < 2%. A progress report is given on the TPC performance during the 1998 commissioning runs (laser rays, beam halo muons, and particles produced by proton/π and lead beams hitting Pb and Au targets).
Published: 1999
Full Text: View/download PDF

13. Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer

Author: B. Lenkeit, G. Agakichiev, H. Appelshäuser, R. Baur, P. Braun-Munzinger, F. Ceretto, A. Cherlin, A. Drees, S. Esumi, U. Faschingbauer, Z. Fraenkel, P. Glässel, G. Hering, P. Holl, Ch. Jung, A. Marin, M. Messer, D. Miskowiec, Y. Panebrattsev, A. Pfeiffer, J. Rak, I. Ravinovich, S. Razin, P. Rehak, M. Richter, N. Saveljic, W. Schmitz, J. Schukraft, W. Seipp, S. Shimanskiy, J. Slivova, E. Socol, H.J. Specht, J. Stachel, I. Tserruya, Th. Ullrich, C. Voigt, S. Voloshin, C. Weber, J.P. Wessels, T. Wienold, J.P. Wurm, and V. Yurevich
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Spectrometer, Hadron, Monte Carlo method, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Nuclear Physics
Abstract: During the 1996 lead run time, CERES has accumulated 42 million events, corresponding to a factor of 5 more statistics than in 1995 and 2.5 million events of a special photon-run. We report on the results of the low-mass e$^+$e$^-$-pair analysis. Since the most critical item is the poor signal-to-background ratio we also discuss the understanding of this background, in absolute terms, with the help of a detailed Monte Carlo simulation. We show preliminary results of the photon analysis and summarize the results of the hadron analysis preliminarily reported on already at QM'97, 10 pages, 9 figures, Proceedings of the XIV Int. Conf. on Nucleus-Nucleus Collisions,Quark Matter 99, Torino, Italy, May 10 - 15, 1999
Published: 1999
Full Text: View/download PDF

14. Elliptic Flow: Transition from Out-of-Plane to In-Plane Emission inAu+AuCollisions

Author: M. L. Gilkes, Wei Zhang, R. Witt, D. Keane, P. Chung, J. Lauret, James Alexander, J. Whitfield, J. L. Chance, S. Y. Panitkin, D. Cebra, N. T. Porile, K. Crowe, R. L. McGrath, Pol Bernard Gossiaux, Pawel Danielewicz, J. C. Kintner, H. G. Ritter, M. Heffner, W. Caskey, L. S. Schroeder, J. L. Romero, G. Rai, A. C. Das, R. P. Scharenberg, H. Liu, M. A. Lisa, Roy A. Lacey, J. Klay, D. Best, N T B Stone, Brian Cole, D. L. Olson, G. Odyniec, C. Law, E. L. Hjort, L. Wood, F. P. Brady, S. Gushue, C. Pinkenburg, T. Case, J. E. Draper, David Krofcheck, M. Justice, Y. M. Liu, T. J. M. Symons, M. Anderson, B. K. Srivastava, L. Huo, Andrew S. Hirsch, N. N. Ajitanand, A. Elmaani, Z. Milosevich, T. Wienold, and Morton Kaplan
Subjects: Physics, Excitation function, Range (particle radiation), Proton, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Boltzmann equation, Out of plane, Nuclear physics, Baryon, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract: We have measured the proton elliptic flow excitation function for the Au + Au system spanning the beam energy range 2 -- 8 AGeV. The excitation function shows a transition from negative to positive elliptic flow at a beam energy, $E_{tr} \sim$ 4 AGeV. Detailed comparisons with calculations from a relativistic Boltzmann-equation are presented. The comparisons suggest a softening of the nuclear equation of state (EOS) from a stiff form (K \sim 380 MeV) at low beam energies (E_{Beam} \le 2 AGeV) to a softer form (K \sim 210 MeV) at higher energies (E_{Beam} \ge $ 4 AGeV) where the calculated baryon density $ \rho \sim 4 \rho_0$.
Published: 1999
Full Text: View/download PDF

15. Baryon Stopping and Charged Particle Distributions in CentralPb+PbCollisions at 158 GeV per Nucleon

Author: C. Roland, Rainer Arno Ernst Renfordt, S. Margetis, A. Piper, N. Xu, Andrzej Rybicki, Jeffrey G. Reid, H. Ströbele, C. A. Whitten, Rene Brun, C. Bormann, P. Foka, R. Brockmann, R. Ganz, H. Hümmler, Ferenc Sikler, Lee Stuart Barnby, H. L. Caines, Norbert Schmitz, D. D. Weerasundara, Peter Graham Jones, Andreas Petridis, J. Sziklai, T. Ullrich, V. Friese, D. Schmischke, B. Boimska, E. Schäfer, Helena Bialkowska, F. Eckhardt, J. Gál, A. Yu. Semenov, J. Bächler, S. Hegyi, G. L. Melkumov, C. O. Blyth, W. Retyk, S. Schönfelder, Gyorgy Vesztergombi, M. Vassiliou, W. Geist, M. Fuchs, G. Roland, Siegfried Wenig, L. Wood, R. Zybert, A. Sandoval, R.J. Porter, Thomas A. Trainor, Alexander Malakhov, H. Appelshäuser, H. G. Fischer, G. Igo, M. Oldenburg, J. Dunn, D. Irmscher, H. Sann, S. Poziombka, D. Cebra, J. Günther, S. Trentalange, M. I. Ferguson, A. M. Poskanzer, Apostolos Panagiotou, S. J. Bailey, T. Wienold, X. Z. Zhu, A. Billmeier, Peter Levai, J. Zimányi, Christina Markert, G. Odyniec, I. Huang, A. Mock, D. J. Prindle, Torsten Henkel, J. Grebieszkow, B. Lasiuk, P. Freund, Marek Kowalski, H. Rudolph, E. Gladysz, P. Seyboth, J. Bartke, J. W. Harris, H. G. Ritter, V. I. Kolesnikov, P. Jacobs, V. Eckardt, T. A. Yates, F. P. Brady, D. Vranic, R. A. Barton, Fuqiang Wang, L. A. Hill, G. E. Cooper, M. Toy, D. Flierl, J. G. Cramer, E. Skrzypczak, I. Szentpetery, Marek Gaździcki, Zoltan Fodor, F. Pühlhofer, J. M. Nelson, Dieter Røhrich, Jozsef Molnar, R. Bock, G.T.A. Squier, K. Kadija, Predrag Buncic, F. Gabler, Gergely Palla, P. Csato, and R. Stock
Subjects: Physics, Nuclear reaction, Proton, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Super Proton Synchrotron, Nuclear physics, Baryon, Rapidity, Atomic physics, Nuclear Experiment, Nucleon
Abstract: Net proton and negative hadron spectra for central Pb+Pb collisions at 158thinspthinspGeV per nucleon at the CERN Super Proton Synchrotron were measured and compared to spectra from lighter systems. Net baryon distributions were derived from those of net protons. Stopping (rapidity shift with respect to the beam) and mean transverse momentum {l_angle}p{sub T}{r_angle} of net baryons increase with system size. The rapidity density of negative hadrons scales with the number of participant nucleons for nuclear collisions, whereas their {l_angle}p{sub T}{r_angle} is independent of system size. The {l_angle}p{sub T}{r_angle} dependence upon particle mass and system size is consistent with larger transverse flow velocity at midrapidity for Pb+Pb compared to S+S central collisions. {copyright} {ital 1999} {ital The American Physical Society}
Published: 1999
Full Text: View/download PDF

16. Λ hyperons in 2 A GeV Ni + Cu collisions

Author: J. A. Hauger, H. G. Ritter, S. Wang, Salvatore Costa, C. P. McParland, G. Rai, Renato Potenza, Antonio Insolia, J. C. Kintner, D. L. Olson, J. L. Romero, J. O. Rasmussen, B. K. Srivastava, Y. Shao, M. L. Gilkes, Sebastiano Albergo, J. L. Chance, M. A. McMahan, Z. Caccia, D. Cebra, R. P. Scharenberg, M. L. Tincknell, H. S. Matis, E. Hjort, H. Liu, J. Romanski, A. Scott, P. Warren, N. T. Porile, Y. Choi, M. A. Lisa, M. Justice, F. P. Brady, A. S. Hirsch, T. Wienold, R. L. McGrath, A. D. Chacon, D. Keane, D. Weerasundara, James B. Elliott, Cristina Tuve, M. D. Partlan, G.V. Russo, F. S. Bieser, K.L. Wolf, H. H. Wieman, and T. J. M. Symons
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, 010308 nuclear & particles physics, Hyperon, Lambda, 01 natural sciences, Nuclear physics, Transverse plane, 0103 physical sciences, Transverse mass, Invariant mass, Multiplicity (chemistry), Impact parameter, Nuclear Experiment, 010306 general physics
Abstract: A sample of Lambda's produced in 2 A*GeV Ni + Cu collisions has been obtained with the EOS Time Projection Chamber at the Bevalac. Low background in the invariant mass distribution allows for the unambiguous demonstration of Lambda directed flow. The transverse mass spectrum at mid-rapidity has the characteristic shoulder-arm shape of particles undergoing radial transverse expansion. A linear dependence of Lambda multiplicity on impact parameter is observed, from which a total Lambda + Sigma^0 production cross section of $112 +/- 24 mb is deduced. Detailed comparisons with the ARC and RVUU models are made.
Published: 1998
Full Text: View/download PDF

17. Spectator Nucleons in Pb+Pb Collisions at 158 A·GeV

Author: P. Csato, Siegfried Wenig, D. Irmscher, J. W. Harris, P. B. Cramer, F. Gabler, B. Lasiuk, J. Dunn, Christina Markert, I. Sakrejda, Panagiota Foka, C. Bormann, J. Gál, A. M. Poskanzer, V. Eckardt, F. Eckhardt, J. G. Cramer, R. A. Barton, Peter Graham Jones, Marek Gaździcki, S. Poziombka, Jozsef Molnar, A. Mock, P. Freund, G. Odyniec, T. Wienold, Torsten Henkel, A. Sandoval, J. Zimányi, G. Igo, Z. Fodor, V. Friese, M. I. Ferguson, Lee Stuart Barnby, X. Z. Zhu, E. Skrzypczak, Gunther Roland, S. Hegyi, Norbert Schmitz, Christof Roland, A. Piper, J. Grebieszkow, M. Toy, H. Hümmler, E. Schäfer, M. Fuchs, A. Yu. Semenov, S. J. Bailey, F. P. Brady, I. Huang, H. Appelshäuser, Andreas Petridis, L. A. Hill, C. O. Blyth, Rainer Arno Ernst Renfordt, M. Vassiliou, Andrzej Rybicki, T. Ullrich, S. Margetis, W. Rauch, L. Wood, Fuqiang Wang, Jeffrey G. Reid, G. L. Melkumov, N. Buncic, Dieter Røhrich, P. Seyboth, W. Retyk, F. Pühlhofer, S. White, J. Seyerlein, H. Sann, J. Sziklai, H. G. Ritter, R. Stock, G.E. Cooper, P. Chan, J. M. Nelson, Peter Levai, Kreso Kadija, I. Szentpetery, D. Flierl, T. A. Yates, Ferenc Sikler, Alexander Malakhov, D. Vranic, D. D. Weerasundara, Thomas A. Trainor, R. Brockmann, J. Bartke, S. Schönfelder, Gyorgy Vesztergombi, D. Schmischke, H. Rudolph, H. G. Fischer, Peter Martin Jacobs, H. Ströbele, Helena Bialkowska, Predrag Buncic, R. K. Bock, R. J. Porter, G. T. A. Squier, D. J. Prindle, G. Pálla, Marek Kowalski, C. A. Whitten, R. Zybert, E. Gladysz, D. Cebra, J. Günther, S. Trentalange, Apostolos Panagiotou, P. Gorodetsky, H. L. Caines, J. Bächler, and V. I. Kolesnikov
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Nuclear Theory, Hadron, Nuclear physics, Deuterium, Nuclear fusion, Neutron, Impact parameter, Nuclear Experiment, Nucleon
Abstract: The composition of forward-going projectile spectator matter in fixed-target Pb+Pb collisions at 158 A · GeV at the CERN SPS has been studied as a function of centrality. The data were measured with the NA49 veto calorimeter. We observe that forward-going spectator matter in central collisions consists of 9 neutrons, 7 protons, and half a deuteron on average. At large impact parameters most spectator nucleons are bound in fragments. The relative resolution of the average impact parameter derived from the measurement of spectator neutrons is roughly 19% in the range from zero to half maximum impact parameters.
Published: 1998
Full Text: View/download PDF

18. Directed and elliptic flow in 158 GeV/nucleon Pb + Pb collisions

Author: J. W. Harris, Jozsef Molnar, F. P. Brady, V. Eckardt, K. Kadija, D. Flierl, D. D. Weerasundara, G.T.A. Squier, M. I. Ferguson, A. Sandoval, D. Irmscher, Siegfried Wenig, D. Schmischke, C. O. Blyth, S. Hegyi, M. Fuchs, C. Bormann, R. J. Porter, S. Margetis, H. G. Fischer, Andrzej Rybicki, H. Appelshäuser, R. A. Barton, J. G. Cramer, S. Schönfelder, Gyorgy Vesztergombi, Helena Bialkowska, D. J. Prindle, Dieter Røhrich, Rene Brun, H. G. Ritter, Marek Gaździcki, Christof Roland, A. Piper, T. Wienold, R. Zybert, S. Voloshin, G.E. Cooper, Rainer Arno Ernst Renfordt, E. Skrzypczak, Marek Kowalski, G. Pálla, Peter Levai, M. Toy, Andreas Petridis, I. Huang, L. Wood, Panagiota Foka, E. Gladysz, F. Eckhardt, P. Freund, J. Sziklai, Ferenc Sikler, F. Pühlhofer, G. L. Melkumov, G. Odyniec, J. Grebieszkow, J. Bächler, M. Vassiliou, V. I. Kolesnikov, G. Igo, M. Oldenburg, E. Schäfer, J. M. Nelson, A. Yu. Semenov, R. Brockmann, P. Csato, R. Stock, J. Seyerlein, Norbert Schmitz, Peter Martin Jacobs, T. A. Yates, D. Vranic, Predrag Buncic, Gunther Roland, P. Seyboth, F. Gabler, H. Rudolph, T. Ullrich, I. Szentpetery, Alexander Malakhov, L. A. Hill, D. Cebra, J. Günther, Peter Graham Jones, S. Trentalange, Apostolos Panagiotou, C. A. Whitten, J. Dunn, Christina Markert, V. Friese, Thomas A. Trainor, S. Poziombka, J. Zimányi, A. Mock, Torsten Henkel, B. Lasiuk, Z. Fodor, H. Hümmler, Jeffrey G. Reid, W. Retyk, W. Rauch, H. Sann, J. Bartke, J. Gál, H. Ströbele, R. K. Bock, Fuqiang Wang, A. M. Poskanzer, Lee Stuart Barnby, H. Caines, and S. J. Bailey
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Elliptic flow, Physics::Fluid Dynamics, Nuclear physics, Pion, Flow (mathematics), Transverse momentum, Rapidity, Nuclear Experiment, Nucleon, Beam (structure)
Abstract: The directed and elliptic flow of protons and charged pions has been observed from the semi-central collisions of a 158 GeV/nucleon Pb beam with a Pb target. The rapidity and transverse momentum dependence of the flow has been measured. The directed flow of the pions is opposite to that of the protons at high rapidity but both exhibit negative flow at low p t . The elliptic flow of both is fairly independent of rapidity but rises with p t .
Published: 1998
Full Text: View/download PDF

19. Collective flow in Au+Au collisions between 2–8 A GeV at AGS

Author: G. Odyniec, R. Scharenberg, J. Chance, D. Krofcheck, T. Case, P. Chung, B. Srivastava, J. Draper, L. Wood, D.A. Cebra, T. Wienold, H. Liu, A. Das, L. Huo, D. Best, J. Kintner, N.T.B. Stone, N.N. Ajitanand, M. Kaplan, D. Keane, L. Schroeder, J. Romero, H.G. Ritter, C. Pinkenburg, M. Gilkes, T.J.M. Symons, M. Heffner, Z. Milosevich, A.S. Hirsch, J. Alexander, R. Lacey, S. Wang, W.N. Zhang, D. Olson, N. Porile, Y. Zhang, K. Crowe, M. Justice, Y. M. Liu, R. McGrath, E. Hjort, W. Caskey, X. Yang, S. Y. Panitkin, J. Whitfield, M. Lisa, S. Gushue, B. Cole, F.P. Brady, and G. Rai
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Mean field theory, Flow (mathematics), Transverse momentum, Observable, Function (mathematics), Statistical physics, Nuclear Experiment, Beam energy
Abstract: The E895 collaboration has undertaken a systematic and exclusive study of Au+Au collisions between 2–8 A GeV. We present preliminary results on collective flow observables as a function of beam energy. Data are compared with theoretical predictions.
Published: 1998
Full Text: View/download PDF

20. CERES results on low-mass electron pair production in PbAu collisions

Author: Y. Panebrattsev, S. Razin, V. I. Yurevich, R. Baur, E. Gatti, M. Messer, S. Shimanskiy, S. Esumi, P. Braun-Munzinger, A. Drees, C.P. de los Heros, F. Ceretto, I. Tserruya, Z. Fraenkel, W. Seipp, J. Rak, G. Tel-Zur, U. Faschingbauer, Marco Sampietro, Johanna Stachel, P. Glässel, Johannes Peter Wessels, J.P. Wurm, T. Wienold, I. Ravinovich, C. Weber, G. Agakichiev, Ch. Fuchs, Ch. Jung, C. Voigt, N. Saveljic, Th. Ullrich, B. Lenkeit, Pavel Rehak, P. Holl, H. J. Specht, Jurgen Schukraft, A. Pfeiffer, M. Richter, and E. Socol
Subjects: Nuclear reaction, Physics, Nuclear physics, Momentum, Nuclear and High Energy Physics, Particle physics, Electron pair, Pair production, Antimatter, Mass spectrum, Multiplicity (chemistry), Nuclear Experiment, Lepton
Abstract: The CERES/NA45 collaboration measured, at the CERN SPS, low-mass electron pair production in Pb Au collisions at 158 A GeV/c incident momentum. In this paper we present an analysis of the data taken during the SPS Pb-beam period in the fall of 1995. The results confirm previous findings of CERES showing that the pair production in the mass range 0.2 ee 2 , when scaled to the ion case with the event multiplicity, is enhanced over the expected yield from the known hadronic sources in pp collisions. A comparison of the results for different multiplicity bins indicates that the excess increases faster than linearly with charged-particle multiplicity. We also present the transverse-momentum distributions of the observed pairs.
Published: 1998
Full Text: View/download PDF

21. Dynamics of radial collective energy in near central collisions for1AGeVAu+C

Author: A. Scott, H. Sann, P. Danielewicz, M. A. McMahan, N. N. Ajitanand, T. Wienold, S. Wang, J. A. Hauger, J. B. Elliott, T. J. M. Symons, J. Romanski, F. P. Brady, R. Potenza, D. Keane, P. Chung, A. D. Chacon, H. H. Wieman, M. L. Gilkes, S. Albergo, M. Justice, P. Warren, V. Lindenstruth, J. L. Chance, S. Costa, H. G. Ritter, M. L. Tincknell, A. S. Hirsch, D. Cebra, N. T. Porile, R. L. McGrath, G. V. Russo, E. L. Hjort, G. Rai, J. O. Rasmussen, Roy A. Lacey, C. P. McParland, M. D. Partlan, Z. Caccia, D. L. Olson, A. Insolia, R. P. Scharenberg, H. S. Matis, M. A. Lisa, Y. Choi, J. Lauret, John M. Alexander, B. K. Srivastava, J. L. Romero, Y. Shao, C. Tuve, Wolfgang Müller, F. S. Bieser, K.L. Wolf, and J. C. Kintner
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Transverse plane, Thermal, Quasiparticle, Coulomb, Atomic physics, Nuclear Experiment, Kinetic energy, Excitation, Energy (signal processing)
Abstract: Transverse kinetic energies of individual fragments have been measured over a broad range of emitter excitation energies for the reaction 1AGeV Au+C. For excitation energies leading to large intermediate mass fragment multiplicities, these transverse energies require large collective radial expansion of the emitting systems. However, the traditional decomposition of the transverse energy into a thermal component and a Coulomb and collective component proportional to the fragment mass cannot account for this expansion. Expansion velocities show an increase with decreasing fragment Z and thus indicate fractionation of the collective energy for the expanding system. This collective energy increases with emitter excitation up to about 50{percent} of the energy deposited for a nuclear system with total energy {approximately}12AMeV. The bulk of the collective energy is carried away by ejectiles of Z{le}3. {copyright} {ital 1998} {ital The American Physical Society}
Published: 1998
Full Text: View/download PDF

22. Multifragmentation of the remnant produced in the reaction of1AGeV gold with carbon

Author: M. A. McMahan, Cristina Tuve, J. O. Rasmussen, M. D. Partlan, C. P. McParland, F. P. Brady, Y. Shao, R. P. Scharenberg, and K. Wolf, S. Wang, H. S. Matis, V. Lindenstruth, M. A. Lisa, J. C. Kintner, A. Scott, J. L. Chance, H. Sann, Y. Choi, D. Cebra, H. G. Ritter, F. S. Bieser, P. Warren, Renato Potenza, J. B. Elliott, D. Keane, B. K. Srivastava, Sebastiano Albergo, E. L. Hjort, J. L. Romero, H. H. Wieman, G. Rai, T. J. M. Symons, M. L. Gilkes, Z. Caccia, T. Wienold, J. A. Hauger, D. L. Olson, J. Romanski, Wolfgang Müller, M. L. Tincknell, N. T. Porile, Salvatore Costa, Andrew S. Hirsch, A. Insolia, A. D. Chacon, G.V. Russo, and M. Justice
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Atomic number, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, Nuclear matter, Nucleon, Excitation, Charged particle, Effective nuclear charge
Abstract: A high-statistics exclusive study of the multifragmentation of 1A GeV gold on carbon has been performed. Particles with Z{le}2 show evidence of emission in a first prompt stage as well as in a second equilibrium stage whereas fragments with Z{ge}3 appear to be emitted essentially only in the second stage. Two methods for the separation of the Z{le}2 particles into the two stages are given and they are in agreement. The yields for each stage are determined as a function of the event charged particle multiplicity m. The mass, nuclear charge, excitation energy per nucleon, and temperature of the remnant left after the first stage and their fluctuations have been determined as a function of m. The expansion of the remnant to fragment freeze-out is examined. The freeze-out temperature is determined from double isotope ratios as a function of m and isentropic trajectories are obtained in the temperature-density plane. The caloric curve shows a monotonic increase with excitation energy. Some of the energy is in the form of radial flow. Overall, the results are consistent with a previous statistical analysis of the data which suggests that, over a certain range of excitation energies, multifragmentation involves a continuous phase transition. {copyright}more » {ital 1998} {ital The American Physical Society}« less
Published: 1998
Full Text: View/download PDF

23. Collective flow and particle spectra in relativistic heavy ion collisions

Author: Yufeng Zhang, James Alexander, H. G. Ritter, M. Heffner, M. L. Gilkes, D. Keane, P. Chung, Y. M. Liu, Lei Huo, C. Pinkenburg, J. Whitfield, N. N. Ajitanand, G. Rai, A. C. Das, F. P. Brady, S. Wang, H. Liu, Roy A. Lacey, D. Best, Z. Milosevich, David Krofcheck, T. Wienold, Morton Kaplan, J. L. Romero, E. Hjort, T. Case, R. P. Scharenberg, Xiaodong Yang, A. S. Hirsch, L. Wood, Kenneth M. Crowe, J. L. Chance, D. Cebra, M. A. Lisa, Brian Cole, G. Odyniec, S. Gushue, W. N. Zhang, M. Justice, D. L. Olson, W. Caskey, J. E. Draper, B. K. Srivastava, N. T. B. Stone, N. T. Porile, R. L. McGrath, L. S. Schroeder, and T. J. M. Symons
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Time projection chamber, Proton, Solid angle, Observable, Rapidity, Atomic physics, Nuclear Experiment, Tracking (particle physics), Spectral line, Particle identification
Abstract: The E895 experiment has undertaken a systematic and exclusive study of Au+Au collisions between 2–8 A GeV. Complete event-by-event data were obtained using the EOS time projection chamber (TPC) which provided good particle identification and continuous tracking over almost 4π solid angle. In central Au+Au collisions at 6 A GeV, the proton rapidity distribution indicates almost complete stopping, hence high baryon density. We present preliminary results on collective flow observables as a function of beam energy. Data are compared with theoretical predictions.
Published: 1998
Full Text: View/download PDF

24. Stopping and radial flow in central58Ni+58Nicollisions between1Aand2AGeV

Author: C. Roy, J. Mösner, D. Wohlfarth, A. Genoux-Lubain, Vladislav Manko, C. Pinkenburg, A. Buta, Christian Claude Kuhn, G. Guillaume, Byung-Sik Hong, E. Häfele, James Ritman, B. Sikora, D. Best, W. Reisdorf, F. Jundt, V. Simion, P. Crochet, W. Neubert, S. Mohren, Mihai Petrovici, U. Sodan, Peter Wagner, J. Biegansky, B. de Schauenburg, A. Somov, Y. Leifels, A. Lebedev, T. Wienold, C. Maazouzi, V. Amouroux, Vasilev, A. Zhilin, R. Kotte, I. Belyaev, Fouad Rami, G.S. Wang, D. Pelte, L. Fraysse, Z. Seres, N. Herrmann, K. D. Hildenbrand, M. Eskef, J. P. Coffin, J. Kecskemeti, J. P. Alard, Pascal Dupieux, D. Schüll, P. Fintz, I. Legrand, M. Trzaska, M. Kirejczyk, L. Tizniti, G. Berek, K. Siwek-Wilczyńska, Nicole Bastid, G. Goebels, R. Dona, P. Pras, M. Korolija, Z. Fodor, and A. Gobbi
Subjects: Physics, Nuclear and High Energy Physics, Energy loss, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Quantum molecular dynamics, Nuclear physics, Nickel, chemistry, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Radial flow, Nuclear Experiment, 010306 general physics
Published: 1998
Full Text: View/download PDF

25. ΔResonance Production inN58i+CuCollisions atE=1.97AGeV

Author: J. O. Rasmussen, A. S. Hirsch, Alwyn C. Scott, Sebastiano Albergo, T. J. M. Symons, Y. Shao, M. L. Gilkes, Y. Choi, G.V. Russo, M. A. McMahan, J. L. Romero, G. Rai, M. L. Tincknell, N. T. Porile, M. Justice, P. Warren, F. S. Bieser, K.L. Wolf, S. Wang, E. L. Hjort, Z. Caccia, M. D. Partlan, H. H. Wieman, R. P. Scharenberg, H. S. Matis, D. Keane, J. L. Chance, D. L. Olson, D. Cebra, Renato Potenza, T. Wienold, J. B. Elliott, J. C. Kintner, A. D. Chacon, Salvatore Costa, A. Insolia, C. P. McParland, J. Romanski, M. A. Lisa, B. K. Srivastava, F. P. Brady, Cristina Tuve, H. G. Ritter, and J. A. Hauger
Subjects: Baryon, Nuclear physics, Physics, Nuclear reaction, Hadron, General Physics and Astronomy, Resonance, Production (computer science), Elementary particle, Invariant mass, Atomic physics, Nuclear Experiment, Delta baryon
Abstract: Invariant mass analyses of (p,{pi}{sup {plus_minus}}) pairs in {sup 58}Ni+Cu collisions at 1.97A GeV have been performed and show correlations resulting from the decays of the {Delta} resonance, the {Lambda} baryon, and possibly the N{sup {asterisk}}(1440) resonance. A reduction in the {Delta} mass is observed and the mass reduction increases with collision centrality. Events generated by the relativistic cascade model (ARC) also reveal a mass reduction. The mass reduction is related to the size of the reaction volume and the details of {Delta} production mechanisms in heavy ion collisions. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997
Full Text: View/download PDF

26. Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 AMeV

Author: D. Best, L. Fraysse, D. Wohlfarth, W. Neubert, U. Sodan, J. P. Wessels, M. Trzaska, N. Cindro, N. Herrmann, Z. Basrak, P. Fintz, C. Maazouzi, R. Čaplar, F. Jundt, P. Crochet, Y. Leifels, C. Pinkenburg, D. Moisa, Th. Blaich, S. C. Jeong, S. Hölbling, G. Guillaume, M. Dželalija, C. Cerruti, T. Wienold, Pascal Dupieux, B. Sikora, R. Dona, G. S. Wang, James Ritman, Mihai Petrovici, M. A. Vasiliev, J. Biegansky, G. Mgebrishvili, V. T. Smolyankin, P. Koncz, P. Pras, Y. Korchagin, Z. Seres, Z. G. Fan, Christian Claude Kuhn, Fouad Rami, K. M. Teh, V. Simion, J. P. Coffin, I. Belyaev, K. Siwek-Wilczyńska, C. Roy, J. Keczkemeti, M. Kirejczyk, Nicole Bastid, L. Tizniti, M. Krämer, D. Schüll, K. Wisniewski, A. Sadchikov, I. Legrand, B. Hong, P. Wagner, R. Kotte, D. Pelte, J. Mösner, W. Reisdorf, Vladislav Manko, A. Buta, R. P. Freifelder, A. Zhilin, V. Amouroux, K. D. Hildenbrand, E. Erö, A.L. Lebedev, J. P. Alard, Z. Fodor, and A. Gobbi
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Phase (waves), Charge (physics), Nuclear matter, Azimuth, Nuclear physics, Nuclear Reactions, Au-197 (Au-197, X), E=100-800 MeV/nucleon, Azimuthal anisotropy, Out-of-plane emission, Atomic physics, Nuclear Experiment, Anisotropy, Saturation (magnetic), Beam (structure)
Abstract: We present new experimental results concerning the azimuthal distributions of proton-likes, light and intermediate mass fragments at midrapidity for Au(100-800 AMeV)+Au collisions measured with the FOPI phase-I detector at GSI in Darmstadt. The azimuthal distributions are investigated as a function of the collision centrality, the incident energy, the fragment charge and transverse momentum. The azimuthal anisotropy is maximum for impact parameters around 7 fm. Intermediate mass fragments present a stronger out-of-plane emission signal than light fragments and a saturation is reached for Z greater than or equal to 4. The azimuthal anisotropy increases with the fragment transverse momentum and decreases as the incident energy increases. The azimuthal anisotropy of Z = 2 particles investigated as a function of the scaled fragment transverse momentum follows an universal curve for bombarding energies between 250-800 AMeV. A signature for a transition from in-plane to out-of-plane emission is evidenced at the lowest beam energies.
Published: 1997
Full Text: View/download PDF

27. Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration

Author: Y. Leifels, Christian Claude Kuhn, E. Häfele, D. Best, Mihai Petrovici, U. Sodan, G. Goebels, James Ritman, A. Gobbi, Peter Wagner, Z. Seres, R. Čaplar, J. Mösner, W. Reisdorf, Vladislav Manko, Y. Korchagin, V. T. Smolyankin, P. Pras, I. Belyaev, J. P. Coffin, A. Buta, D. Moisa, D. Wohlfarth, A. Genoux-Lubain, V. Ramillien, G. Guillaume, G.S. Wang, F. Jundt, P. Crochet, V. Simion, D. Lambrecht, A. Zhilin, C. Roy, M. Eskef, Z. Fodor, P. Koncz, V. Amouroux, R. Kotte, M. Kirejczyk, J. P. Alard, T. Wienold, D. Pelte, J. Biegansky, M. A. Vasiliev, Anton Andronic, D. Schüll, I. Legrand, J. Kecskemeti, Nicole Bastid, P. Fintz, Fouad Rami, N. Herrmann, C. Pinkenburg, M. Korolija, Byung-Sik Hong, Alexandre Lebedev, B. Sikora, W. Neubert, M. Trzaska, N. Cindro, Pascal Dupieux, H. Merlitz, S. Mohren, J. Erö, K. D. Hildenbrand, K. Siwek-Wilczyńska, Z. Basrak, and M. Dzelalija
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Equation of state, Nuclear Theory, Kinetic energy, Spectral line, Momentum, Nuclear physics, Pion, Nuclear fusion, Hermetic detector, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities ngp increase with the number of participants Apart. The average pion multiplicities per participant are #### and #### These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio #### increases with Apart and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (T l,π) and high (Th,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg is larger than , the high temperatures , are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed.
Published: 1997
Full Text: View/download PDF

28. The Energy Dependence of Flow in Ni Induced Collisions from400Ato1970AMeV

Author: M. Justice, R. P. Scharenberg, H. S. Matis, T. J. M. Symons, M. L. Gilkes, B. K. Srivastava, Y. Choi, Sebastiano Albergo, F. S. Bieser, S. Wang, K.L. Wolf, Andrew S. Hirsch, T. Wienold, Renato Potenza, D. Keane, J. B. Elliott, Antonio Insolia, C. P. McParland, J. L. Romero, H. H. Wieman, Salvatore Costa, J. C. Kintner, F. P. Brady, M. A. Lisa, A. Scott, M. A. McMahan, J. L. Chance, D. Cebra, P. Warren, E. L. Hjort, G. Rai, J. Romanski, Cristina Tuve, M. L. Tincknell, N. T. Porile, Z. Caccia, M. D. Partlan, A. D. Chacon, G.V. Russo, Y. Shao, J. O. Rasmussen, D. L. Olson, H. G. Ritter, and J. A. Hauger
Subjects: Physics, 010308 nuclear & particles physics, Computer Science::Information Retrieval, General Physics and Astronomy, chemistry.chemical_element, Nuclear matter, 01 natural sciences, 7. Clean energy, Copper, Nuclear physics, Nickel, chemistry, Flow (mathematics), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Scaling, Energy (signal processing)
Abstract: We study the energy dependence of collective (hydrodynamic-like) nuclear matter flow in (400{endash}1970){ital A} MeV Ni+Au and (1000{endash}1970){ital A} MeV Ni+Cu reactions. The flow increases with energy, appears to reach a maximum, and then to decrease at higher energies. A way of comparing the energy dependence of flow values for different projectile-target mass combinations is introduced, which demonstrates a more-or-less common scaling behavior among flow values from different systems. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997
Full Text: View/download PDF

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

Author: J. Biegansky, Peter Wagner, F. Jundt, D. Schüll, I. Legrand, A. Sadchikov, M. A. Vasiliev, V. Simion, P. Fintz, D. Best, A. Zhilin, G.S. Wang, C. Roy, S. C. Jeong, Fouad Rami, P. Crochet, S. Hölbling, Z. Seres, K. D. Hildenbrand, Z. G. Fan, Byung-Sik Hong, R. Kotte, G. Mgebrishvili, V. T. Smolyankin, P. Pras, D. Pelte, Mihai Petrovici, U. Sodan, Christian Claude Kuhn, C. Maazouzi, N. Herrmann, W. Neubert, C. Pinkenburg, Y. Leifels, J. P. Coffin, B. Sikora, James Ritman, H. Stöcker, Z. Basrak, J. Kecskemeti, M. Dzelalija, P. Koncz, Y. Korchagin, D. Wohlfarth, T. Wienold, Pascal Dupieux, Z. Fodor, A. Lebedev, Nicole Bastid, L. Fraysse, M. Trzaska, N. Cindro, L. Tizniti, J. P. Wessels, R. Čaplar, R. Donà, Vladislav Manko, V. Amouroux, J. P. Alard, I. Belyaev, M. Kirejczyk, D. Moisa, J. Mösner, A. Buta, G. Guillaume, J. Konopka, A. Gobbi, W. Reisdorf, 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: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Flow (psychology), Degrees of freedom (physics and chemistry), Nuclear Reactions. Heavy ion collisions. Nuclear matter flow. Clusters, pacs:25.70.-z, 01 natural sciences, Charged particle, Nuclear physics, Cross section (physics), Transverse plane, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear fusion, Selection method, Polar coordinate system, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: Using the FOPI facility at GSI, charged particles (1 ≤Z≤6) produced in the Au(150 A MeV)+Au reaction have been measured at laboratory angles 1.20 < Θlab < 300. Highly central collisions have been selected with two criteria, both dealing with the longitudinal and transverse degrees of freedom of the reaction. The relevance of this selection method is supported by QMD calculations which indicate that such criteria are able to select mean impact parameters less than 2 fm. Bias effects introduced by the criteria have been evaluated. The centre-of-mass polar angle distributions of low energy clusters emitted in these central collisions, have been extracted: the intensity ratio deduced for a transverse to longitudinal emission is found to be R= 1.4 −0.4 +0.2 . Model comparisons using QMD are presented. The value of R appears to depend sensitively on the nucleon-nucleon cross section, σnn. Within this model, a value of σ=25+ - 5 mb is derived.
Published: 1997
Full Text: View/download PDF

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

Author: W. Reisdorf, D. Best, A. Gobbi, N. Herrmann, K.D. Hildenbrand, B. Hong, S.C. Jeong, Y. Leifels, C. Pinkenburg, J.L. Ritman, D. Schüll, U. Sodan, K. Teh, G.S. Wang, J.P. Wessels, T. Wienold, J.P. Alard, V. Amouroux, Z. Basrak, N. Bastid, I. Belyaev, L. Berger, J. Biegansky, M. Bini, S. Boussange, A. Buta, R. Čaplar, N. Cindro, J.P. Coffin, P. Crochet, R. Dona, P. Dupieux, M. Dželalija, J. Erö, M. Eskef, P. Fintz, Z. Fodor, L. Fraysse, A. Genoux-Lubain, G. Goebels, G. Guillaume, Y. Grigorian, E. Häfele, S. Hölbling, A. Houari, M. Ibnouzahir, M. Joriot, F. Jundt, J. Kecskemeti, M. Kirejczyk, P. Koncz, Y. Korchagin, M. Korolija, R. Kotte, C. Kuhn, D. Lambrecht, A. Lebedev, I. Legrand, C. Maazouzi, V. Manko, T. Matulewicz, P.R. Maurenzig, H. Merlitz, G. Mgebrishvili, J. Mösner, S. Mohren, D. Moisa, G. Montarou, I. Montbel, P. Morel, W. Neubert, A. Olmi, G. Pasquali, D. Pelte, M. Petrovici, G. Poggi, P. Pras, F. Rami, V. Ramillien, C. Roy, A. Sadchikov, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczyńska, V. Smolyankin, N. Taccetti, R. Tezkratt, L. Tizniti, M. Trzaska, M.A. Vasiliev, P. Wagner, K. Wisniewski, D. Wohlfarth, and A. Zhilin
Subjects: Physics, selected central collisions, Nuclear and High Energy Physics, Angular range, E=150 and 250 and 400 MeV/nucleon, Isotope, charges and yields, comparison to statistical multifragmentation models, FOS: Physical sciences, deduced radial flow, measured fragment velocity vectors, Effective nuclear charge, Charged particle, Azimuth, Nuclear physics, Transverse plane, Cross section (physics), NUCLEAR REACTIONS Au(Au,X), chemical composition, Nuclear Experiment (nucl-ex), Nuclear Experiment, Quantum, quantum molecular dynamics model
Abstract: Collisions of Au on Au at incident energies of 150, 250 and 400 A MeV were studied with the FOPI-facility at GSI Darmstadt. Nuclear charge (Z < 16) and velocity of the products were detected with full azimuthal acceptance at laboratory angles of 1-30 degrees. Isotope separated light charged particles were measured with movable multiple telescopes in an angular range of 6-90 degrees. Central collisions representing about 1 % of the reaction cross section were selected by requiring high total transverse energy, but vanishing sideflow. The velocity space distributions and yields of the emitted fragments are reported. The data are analysed in terms of a thermal model including radial flow. A comparison with predictions of the Quantum Molecular Model is presented., LateX text 62 pages, plus six Postscript files with a total of 34 figures, accepted by Nucl.Phys.A
Published: 1997
Full Text: View/download PDF

31. Preliminary results on Pb+Pb collisions from the Grid-TOF data analysed in Budapest

Author: S. Schönfelder, Gyorgy Vesztergombi, J. W. Harris, L. A. Hill, G. E. Cooper, M. A. Bloomer, I. Huang, L. Wood, V. Eckardt, X.-Z. Zhu, J. Dunn, J. Bächler, M. Vassiliou, B. Lasiuk, C. Bormann, D. Vranic, I. Derado, K. Runge, I. Szentpetery, A. M. Poskanzer, F. P. Brady, P. Seyboth, P. B. Cramer, Jozsef Molnar, M. I. Ferguson, R. Brockmann, J. G. Cramer, A. Piper, K. Kadija, S. Euler, S. Trentalange, Marek Gaździcki, W. Heck, P. Csato, D. Irmscher, G. Odyniec, H. Appelshäuser, R. Stock, H. G. Fischer, M. Toy, J. Grebieszkow, C. O. Blyth, N. Schmitz, Dieter Røhrich, Thomas A. Trainor, P. Chan, E. Skrzypczak, T. Wienold, Peter Levai, Panagiota Foka, F. Eckhardt, J. Gál, J. Zimányi, H. L. Caines, P. Jacobs, F. Pühlhofer, G. Igo, J. M. Nelson, H. G. Ritter, M. A. Howe, Z. Fodor, A. Petridis, Predrag Buncic, C. A. Whitten, T. Alber, P. Freund, G. Pálla, J. Gunther, E. Schäfer, J. Seyerlein, W. Rauch, H. Ströbele, Helena Bialkowska, H. Sann, R. Zybert, J. Bartke, D. J. Prindle, Marek Kowalski, H. Rudolph, E. Gladysz, F. Bieser, J. Sziklai, J. W. Mitchell, D. Cebra, Apostolos Panagiotou, A. Kühmichel, A. Sandoval, S. Hegyi, M. Fuchs, A. Mock, Siegfried Wenig, S. Margetis, W. Retyk, Ferenc Sikler, Peter Graham Jones, R. K. Bock, and R. Renfordt
Subjects: Condensed Matter::Quantum Gases, Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Hadron, General Physics and Astronomy, Grid, Tracking (particle physics), Particle identification, Spectral line, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, NA49 experiment
Abstract: The first results from the NA49 experiment, using a large acceptance tracking detector with particle identification, are presented which have been obtained from the recent Pb-ion run at the CERN SPS. Preliminary spectra of kaons and protons identified by the Grid-TOF detector as well as Bose-Einstein correlations are shown.
Published: 1996
Full Text: View/download PDF

32. Hadron yields and hadron spectra from the NA49 experiment

Author: D. D. Weerasundara, C. Bormann, J. Bächler, D. Schmischke, M. Vassiliou, P. Seyboth, D. Irmscher, Rainer Arno Ernst Renfordt, A. Piper, H. G. Fischer, Ferenc Sikler, C. O. Blyth, Siegfried Wenig, J. Sziklai, Kreso Kadija, F. Pühlhofer, G.E. Cooper, H. G. Ritter, Peter Levai, J. Gál, D. Cebra, J. Günther, J. W. Harris, J. M. Nelson, M. Toy, Apostolos Panagiotou, G. L. Melkumov, I. Huang, L. Wood, J. Grebieszkow, S. Schönfelder, V. Eckardt, P. B. Cramer, X.-Z. Zhu, G. Odyniec, J. G. Cramer, Gyorgy Vesztergombi, Andreas Petridis, F. P. Brady, P. Freund, Lee Stuart Barnby, M. Cyprian, Peter Graham Jones, Marek Gaździcki, N. Bunicic, J. W. Mitchell, Christof Roland, A. M. Poskanzer, H. Appelshäuser, Jozsef Molnar, R. Bock, M. I. Ferguson, Helena Bialkowska, S. Margetis, T. Wienold, E. Skrzypczak, S. Poziombka, R. Zybert, S. Trentalange, J. Zimányi, R. Brockmann, V. I. Kolesnikov, T. A. Yates, D. Vranic, D. J. Prindle, H. Rudolph, D. Flierl, Peter Martin Jacobs, Marek Kowalski, I. Szentpetery, Predrag Buncic, S. Euler, E. Gladysz, A. Mock, Z. Fodor, H. Hümmler, G. Pálla, Andrzej Rybicki, E. Schäfer, A. Yu. Semenov, A. Sandoval, J. Seyerlein, H. L. Caines, S. Hegyi, M. Fuchs, W. Retyk, Alexander Malakhov, P. Csato, R. Stock, F. Gabler, B. Lasiuk, I. Derado, Panagiota Foka, O. Dietz, L. A. Hill, Thomas A. Trainor, P. Chan, H. Sann, J. Dunn, Christina Markert, S. Afanasiev, F. Eckhardt, J. Bartke, G. Igo, H. Ströbele, W. Rauch, N. Schmitz, Dieter Røhrich, Gunther Roland, M. A. Howe, C. A. Whitten, and T. Alber
Subjects: Physics, Nuclear physics, S system, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Hadron, Nuclear Experiment, Nucleon, Central region, NA49 experiment, Spectral line
Abstract: Preliminary inclusive spectra of negative hadrons, net protons and neutral strange particles are presented, measured by the NA49 experiment in central Pb+Pb collisions at 158 GeV per nucleon. Comparison of their yields with those from the lighter S+S system suggests that the yields scale approximately with the number of participating nucleons.
Published: 1996
Full Text: View/download PDF

33. Stopping and collective effects at SPS energies

Author: J. Dunn, Christina Markert, Siegfried Wenig, M. A. Howe, S. Poziombka, Serguei Afanasiev, F. Pühlhofer, J. Zimányi, J. G. Cramer, J. Sziklai, C. A. Whitten, C. O. Blyth, M. I. Ferguson, J. M. Nelson, A. M. Poskanzer, T. Alber, Lee Stuart Barnby, F. P. Brady, W. Rauch, S. Schönfelder, Gyorgy Vesztergombi, Andreas Petridis, D. Prindle, Norbert Schmitz, L. A. Hill, C. Bormann, Helena Bialkowska, G. L. Melkumov, M. Vassiliou, Marek Kowalski, R. Zybert, S. Margetis, Peter Martin Jacobs, H. Sann, Marek Gaździcki, R. Brockmann, E. Gladysz, Predrag Buncic, Peter Graham Jones, G. Odyniec, E. Schäfer, Jozsef Molnar, D. Irmscher, R. Bock, J. W. Mitchell, P. Seyboth, A. Yu. Semenov, S. Euler, J. Bartke, M. Toy, T. A. Yates, D. Vranic, F. Eckhardt, M. Cyprian, Gunther Roland, J. Grebieszkow, Christof Roland, P. Chan, J. W. Harris, H. Rudolph, H. G. Ritter, E. Skrzypczak, P. B. Cramer, N. Buncic, Rainer Arno Ernst Renfordt, J. Seyerlein, Peter Levai, A. Piper, H. Ströbele, G. Igo, J. Gál, D. Cebra, J. Günther, V. Eckardt, S. Trentalange, Apostolos Panagiotou, T. A. Trainor, I. Szentpetery, I. Huang, Ferenc Sikler, P. Freund, L. Wood, D. D. Weerasundara, D. Schmischke, D. Flierl, H. G. Fischer, Dieter Røhrich, H. Appelshäuser, G.E. Cooper, G. Pálla, X. Z. Zhu, K. Kadija, A. Sandoval, S. Hegyi, M. Fuchs, J. Bächler, V. I. Kolesnikov, H. L. Caines, Andrzej Rybicki, T. Wienold, P. Csato, R. Stock, Panagiota Foka, O. Dietz, F. Gabler, B. Lasiuk, I. Derado, A. Mock, Z. Fodor, H. Hümmler, W. Retyk, and Alexander Malakhov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, Spectrometer, Nuclear Theory, Collision, Projection (linear algebra), Nuclear physics, Time of flight, Energy flow, Rapidity, Nuclear Experiment, Nucleon
Abstract: We discuss preliminary data on stopping for central Pb + Pb collisions at 158 GeV/nucleon. The (net) proton rapidity density measured by the NA49 Time Projection Chambers, NA49 Time of Flight and the NA44 spectrometer is presented. Slightly higher stopping is observed relative to S + S at 200 GeV/nucleon. The rapidity density exhibits a plateau around mid-rapidity which is qualitatively different from results at the AGS and BEVALAC/SIS energies. The second part of the paper discusses the azimuthal correlation of the energy flow. Preliminary results reveal that the ‘fireball’ preserves the information of the collision geometry even at SPS energies.
Published: 1996
Full Text: View/download PDF

34. Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A·MeV

Author: Z. Basrak, P. Morel, R. Tezkratt, A. Sadchikov, Nello Taccetti, K. D. Hildenbrand, J. P. Alard, R. Dona, Mihai Petrovici, R. Freifelder, Y. Korchagin, A. Houari, J. P. Wessels, G. Mgebrishvili, I. Legrand, V. Ramillien, Gabriele Pasquali, M. Krämer, Nicole Bastid, M. Dželalija, G. Guillaume, A. Buta, Pascal Dupieux, F. Jundt, P. Koncz, J. Erö, P. Wagner, Z. Seres, P. R. Maurenzig, D. Wohlfarth, J. Mösner, P. Fintz, J. P. Coffin, Y. Grigorian, Th. Blaich, Vladislav Manko, R. Kotte, D. Pelte, Christian Claude Kuhn, Gerard Montarou, T. Wienold, S. Hölbling, V. Simion, S. Frolov, D. Moisa, U. Sodan, Z.G. Fan, D. Schüll, M. A. Vasiliev, I. M. Belayev, A. Zhilin, F. Rami, V. Amouroux, J. Kecskemeti, S. Smolyankin, N. Herrmann, Alexandre Lebedev, B. Sikora, W. Neubert, W. Reisdorf, Alessandro Olmi, Z. Wilhelmi, R. Čaplar, A. Gobbi, M. Ibnouzahir, S. Boussange, C. Maguire, L. Berger, C. Cerruti, Zoltan Fodor, S. C. Jeong, Giacomo Poggi, Maurizio Bini, Pawel Danielewicz, I. Montbel, L. Fraysse, M. Trzaska, and N. Cindro
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), Isotope, Hydrogen, Phase (waves), chemistry.chemical_element, Kinetic energy, Spectral line, Coincidence, Nuclear physics, chemistry, Atomic physics, Nuclear Experiment
Abstract: Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100–250 A ·MeV, using ΔE − E R telescopes in coincidence with the FOPI detector in its phase I configuration. Center-of-mass energy spectra have been measured for Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.
Published: 1995
Full Text: View/download PDF

35. Mass dependence of π0-production in heavy ion collisions at 1 A GeV

Author: V. Metag, S.C. Jeong, J. Ritman, H. W. Wilschut, D. Wohlfahrt, T. Wienold, R.S. Simon, M. Röbig-Landau, O. Schwalb, S. Hlavac, K. Teh, L.B. Venema, W. Kühn, Pascal Dupieux, R. W. Novotny, A. E. Raschke, U. Sodan, Nicole Bastid, Johannes Peter Wessels, J. P. Alard, Michal Sumbera, Gerard Montarou, W. Neubert, M. Franke, F. D. Berg, N. Herrmann, K. D. Hildenbrand, N. Brummund, Herbert Löhner, A. Gobbi, M. Pfeiffer, M. Notheisen, and Research unit Medical Physics
Subjects: Physics, DYNAMICS, Nuclear and High Energy Physics, High energy, Argon, COLLECTIVE FLOW, Krypton, Nuclear Theory, NUCLEUS-NUCLEUS COLLISIONS, Collision system, chemistry.chemical_element, PION-PRODUCTION, STATE, Nuclear physics, ENERGY, Pion, chemistry, Cascade, EQUATION, Heavy ion, PARTICLE-PRODUCTION, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, MATTER
Abstract: The production of neutral pions has been studied in the reactions 40 Ar + nat Ca , 86 Kr + nat Zr and 197 Au + 197 Au at 1 A GeV. For high energy pions emitted from the heavier systems a steeper than linear rise of the pion multiplicity with the centrality of the reaction is observed, indicating a pion production process other than binary nucleon-nucleon collisions. At low transverse momenta an enhancement of the π 0 -multiplicity increasing with the mass of the collision system is found. Systematic discrepancies between the experimental results and recent BUU, QMD and Cascade calculations are discussed.
Published: 1994

36. Velocity correlations of intermediate mass fragments produced in central collisions of Au+Au atE=150AMeV

Author: O. Houari, Z. Wilhelmi, A.L. Lebedev, C. Maguire, I. M. Belayev, M. Krämer, P. Koncz, D. Moisa, J. Mösner, D. Wohlfarth, G. Montaru, A. Sadchikov, M. A. Vasiliev, V. Simion, Vladislav Manko, R. Freifelder, A. Buta, D. Schüll, J. P. Wessels, Z. Basrak, F. Jundt, I. Legrand, Fouad Rami, S. Frolov, G. Guillaume, W. Reisdorf, R. Kotte, J. P. Alard, K. Teh, D. Pelte, P. Wagner, B. Sikora, Mihai Petrovici, N. Herrmann, S. C. Jeong, Y. Korchagin, U. Sodan, A. L. Zhilin, Z. G. Fan, K. D. Hildenbrand, J. Kecskemeti, R. Čaplar, S. Smolyankin, I. Montbel, G. Mgebrishvili, R. Tezkratt, A. Gobbi, L. Fraysse, M. Trzaska, Nicole Bastid, M. Jorio, Z. Seres, Th. Blaich, S. Hölbling, N. Cindro, J. Erö, J. P. Coffin, T. Matulewicz, C. Cerruti, W. Neubert, Christian Claude Kuhn, Zoltan Fodor, P. Morel, Pascal Dupieux, Y. Grigorian, T. Wienold, P. Fintz, and B. Kämpfer
Subjects: Nuclear physics, Nuclear reaction, Physics, Azimuth, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), Detector, Coulomb, Interaction model, Atomic physics, Nuclear Experiment, Beam energy
Abstract: Velocity correlations of intermediate mass fragments (IMFs), produced in central collisions of Au+Au at 150 MeV beam energy, are extracted from measurements with the FOPI (phase I) detector system at SIS in GSI Darmstadt. The IMF correlation function for semicentral events is found to be affected by the directed sideward flow. When rotating the events into a unique reaction plane an enhancement of correlations, resulting from event mixing effects, vanishes. Selecting violent collisions with a high degree of azimuthal symmetry the correlation function appears nearly independent of additional event or single particle gate conditions. The comparison of the data with a Coulomb dominated final-state interaction model points to an expanding and multifragmenting soure with radius [ital R][similar to]14 fm.
Published: 1993
Full Text: View/download PDF

37. A highly-segmented ΔE-time-of-flight wall as forward detector of the 4π-system for charged particles at the SIS/ESR accelerator

Author: M. A. Vasiliev, V. Simion, M. Crouau, G. Augustinski, J.P. Coffin, D. Vincent, F. Hornecker, S. Frolov, M. Marquardt, R. Freifelder, Z. Basrak, C. Cerruti, R. Kotte, N. Herrmann, L. Fraysse, B. Sikora, S. C. Jeong, Gerard Montarou, Z. G. Fan, Y. Grigorian, P. Koncz, S. Smolyankin, P. Morel, W. Reisdorf, R. Bock, D. Wohlfarth, R. Čaplar, N. Cindro, G. Mgebrishvili, J. Erö, A. Gobbi, R. Neunlist, G. Ortlepp, J.P. Wessels, P. Boccaccio, E. Sahuc, J.P. Alard, C. Kuhn, M. Jorio, J. Mösner, E. Gimenez, Vladislav Manko, C. Maguire, T. Matulewicz, S. Boussange, A. Buta, Y. Korchagin, I. Montbel, N. Bastid, D. Schüll, I. Legrand, Th. Blaich, Z. Fodor, I. M. Belayev, M. Krämer, G. Guillaume, S. Hölbling, R. J. Charity, Z. Seres, M.A. Saettel, D. Moisa, P. Fintz, F. Rami, P. Dupieux, B. Tischler, T. Wienold, J. Kecskemeti, J. Weinert, A. Houari, R. Tezkratt, M. Trzaska, W. Neubert, D. Pelte, A.L. Lebedev, P. Wagner, Mihai Petrovici, U. Sodan, J.F. Devin, K.D. Hildenbrand, M.H. Tanaka, F. Jundt, A. Zhilin, K. Teh, F. Daudon, C. Fayard, S. Mayade, Z. Wilhelmi, and G. Savinel
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Wire chamber, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Scintillator, Particle detector, Charged particle, Nuclear physics, Time of flight, Ionization chamber, Atomic physics, Nuclear Experiment, Instrumentation
Abstract: At the SIS/ESR accelerator facility at GSI in Darmstadt the 4π-detector system FOPI is under construction at present. It is designed for the investigation of central collisions of heavy ions in the energy range up to 2 A GeV. As phase I of this detector a forward wall has been built and used in various experiments. It comprizes a total number of 764 scintillators with an additional shell of 188 thin ΔE -detectors in front of it and covers the full azimuth of the polar angles from 1° to 30°. The velocity and the nuclear charge of the fragments are determined by a combined time-of-flight and ΔE measurement.
Published: 1993
Full Text: View/download PDF

38. Midrapidity source of intermediate-mass fragments in highly central collisions of Au + Au at 150AMeV

Author: Alessandro Olmi, Y. Grigorian, Th. Blaich, P. Koncz, Z. Seres, T. Matulewicz, S. Hölbling, J. Kecskemeti, R. Tezkratt, D. Schüll, I. Legrand, M. Crouau, P. Fintz, R. Freifelder, J. P. Alard, M. A. Vasiliev, V. Simion, P. Morel, Z. Basrak, Fouad Rami, A. Sadchikov, F. Jundt, R. Kotte, Zoltan Fodor, Nello Taccetti, D. Pelte, C. Cerruti, R. Čaplar, Gerard Montarou, J. Erö, D. Moisa, A. Zhilin, Z. Wilhelmi, J. Mösner, K.D. Hildenbrand, K. Teh, T. Wienold, S. Smolyankin, A. Buta, Mihai Petrovici, U. Sodan, P. Wagner, G. Guillaume, S. C. Jeong, Gabriele Pasquali, W. Neubert, M. Jorio, Pascal Dupieux, G. Mgebrishvili, Y. Korchagin, Giacomo Poggi, J.P. Wessels, J. P. Coffin, W. Reisdorf, L. Fraysse, A. Gobbi, M. Trzaska, N. Cindro, Christian Claude Kuhn, C. Maguire, I. M. Belayev, M. Krämer, D. Wohlfarth, Z. G. Fan, Maurizio Bini, N. Herrmann, Vladislav Manko, B. Sikora, O. Houari, Nicole Bastid, A.L. Lebedev, S. Frolov, and R. Bock
Subjects: Physics, Nuclear physics, Nuclear reaction, Transverse plane, Isotope, General Physics and Astronomy, Incident energy, Isotopes of gold, Atomic physics, Nuclear Experiment, Selection criterion, Effective nuclear charge, Charged particle
Abstract: Charged particles have been observed in collisions of Au on Au at an incident energy of 150{ital A} MeV using a high-granularity detector system covering approximately the forward hemisphere in the center-of-mass system. Highly central collisions have been studied using a double selection criterion which combines large charged-particle multiplicities with small transverse-momentum directivities. In this class of events about one quarter of the total nuclear charge emerges as intermediate-mass fragments with nuclear charges {ital Z}{gt}2. These fragments are centered at midrapidity and are produced with large transverse velocities.
Published: 1992
Full Text: View/download PDF

39. Modification of jet-like correlations in Pb-Au collisions at 158A GeV/c

Author: Peter Glassel, S. I. Esumi, V. Kushpil, M. Kalisky, S. Yurevich, Alexander Milov, Michal Sumbera, W. Dubitzky, W. Schmitz, C. Garabatos, A. Drees, S. Shimansky, Jovan Milosevic, H. Appelshäuser, I. Ravinovich, S. Sedykh, I. Tserruya, J. Bielcikova, K. Filimonov, Dagmar Adamová, Johanna Stachel, J. Rak, S. Damjanović, Johannes Peter Wessels, V. Petracek, A. Cherlin, V. I. Yurevich, S. Kniege, T. Wienold, Axel Maas, D. Miskowiec, Peter Braun-Munzinger, Oliver Busch, O. Petchenova, Andreas Pfeiffer, Wei Xie, H. Tilsner, Ana Maria Marin, Z. Fraenkel, G. Agakichiev, V. V. Belaga, Y. Panebrattsev, J.P. Wurm, K. Fomenko, D. Antończyk, M. Ploskon, Thomas Dietel, S. Schuchmann, H. Sako, L. Dietrich, Pavel Rehak, and J. Holeczek
Subjects: Physics, Nuclear and High Energy Physics, Energy transfer, FOS: Physical sciences, Charge (physics), Parton, Jet (particle physics), Collision, Charged particle, Nuclear physics, Correlation analysis, Particle, Nuclear Physics - Experiment, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Results of a two-particle correlation analysis of high-$p_t$ charged particles in Pb-Au collisions at 158$A$ GeV/$c$ are presented. The data have been recorded by the CERES experiment at the CERN-SPS. The correlations are studied as function of transverse momentum, particle charge and collision centrality. We observe a jet-like structure in the vicinity of a high-$p_t$ trigger particle and a broad back-to-back distribution. The yields of associated particles per trigger show a strong dependence on the trigger/associate charge combination. A comparison to PYTHIA confirms the jet-like pattern at the near-side but suggests a strong modification at the away-side, implying significant energy transfer of the hard-scattered parton to the medium., Comment: 4 figures
Published: 2009
Full Text: View/download PDF

40. Azimuthal dependence of pion source radii inPb+Aucollisions at 158AGeV/c

Author: Axel Maas, J. P. Wessels, H. Tilsner, S. Schuchmann, Mateusz Andrzej Ploskon, Anton Andronic, Z. Fraenkel, V. I. Yurevich, S. Esumi, J. Holeczek, S. Radomski, Jana Bielcikova, L. Dietrich, I. Tserruya, Dariusz Czeslaw Miskowiec, G. Hering, Dagmar Adamová, J. Rak, A. Drees, Peter Braun-Munzinger, W. Schmitz, R. Ortega, Ana Maria Marin, H. Sako, G. Agakichiev, Jovan Milosevic, Oliver Busch, I. Ravinovich, Johanna Stachel, S. Yurevich, O. Petchenova, Jurgen Schukraft, V. Belaga, S. Shimansky, V. Kushpil, A. Cherlin, Peter Glassel, Rachik Soualah, W. Dubitzky, C. Garabatos, H. Appelshäuser, Thomas Dietel, M. Kalisky, K. Filimonov, K. Fomenko, S. Sedykh, S. Damjanovic, V. Petráček, G. Tsiledakis, Y. Panebrattsev, J.P. Wurm, T. Wienold, D. Antonczyk, S. Kniege, Pavel Rehak, and Michal Sumbera
Subjects: Physics, Nuclear and High Energy Physics, Meson, Plane (geometry), Nuclear Theory, Hadron, Elementary particle, Alternating Gradient Synchrotron, Nuclear physics, Pion, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Relativistic Heavy Ion Collider, Boson
Abstract: We present results of a two-pion correlation analysis performed with the Pb+Au collision data collected by the upgraded CERES experiment in the fall of 2000. The analysis was done in bins of the reaction centrality and the pion azimuthal emission angle with respect to the reaction plane. The pion source, deduced from the data, is slightly elongated in the direction perpendicular to the reaction plane, similarly as was observed at the Brookhaven National Laboratory Alternating Gradient Synchrotron and Relativistic Heavy Ion Collider.
Published: 2008
Full Text: View/download PDF

41. The CERES/NA45 Radial Drift Time Projection Chamber

Author: Alexander Milov, S. Damjanović, T. Wienold, S. Shimansky, G. Agakichiev, Luciano Musa, J. Holeczek, W. Dubitzky, W. Seipp, H. Appelshäuser, V. V. Belaga, M. Richter, I. Ravinovich, S. Yurevich, E. Schäfer, G. Hering, Andreas Pfeiffer, Y. Panebrattsev, A. Drees, A. Cherlin, J.P. Wurm, I. Tserruya, V. Kushpil, J. Rak, Bernd Stefan Windelband, R. Campagnolo, H. Tilsner, V. Petracek, S. I. Esumi, Archana Sharma, Dagmar Adamová, D. Antończyk, Z. Fraenkel, Jurgen Schukraft, Jovan Milosevic, Johanna Stachel, Johannes Peter Wessels, A. Marin, Wei Xie, V. I. Yurevich, K. Filimonov, Peter Glassel, Peter Braun-Munzinger, L. Dietrich, O. Pechenova, Michal Sumbera, W. Schmitz, C. Garabatos, D. Miśkowiec, H. Sako, T. Dietel, and J. Bielčíková
Subjects: Physics, Nuclear and High Energy Physics, Momentum (technical analysis), Time projection chamber, Drift velocity, Spectrometer, business.industry, Physics::Instrumentation and Detectors, Resolution (electron density), FOS: Physical sciences, Particle detector, Nuclear physics, Optics, Calibration, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), business, Nuclear Experiment, Instrumentation, Image resolution
Abstract: The design, calibration, and performance of the first radial drift Time Projection Chamber (TPC) are presented. The TPC was built and installed at the CERES/NA45 experiment at the CERN SPS in the late nineties, with the objective to improve the momentum resolution of the spectrometer. The upgraded experiment took data twice, in 1999 and in 2000. After a detailed study of residual distortions a spatial resolution of 340 um in the azimuthal and 640 um in the radial direction was achieved, corresponding to a momentum resolution of Dp/p = sqrt{(1% * p/GeV)^2 + (2%)^2}., Comment: 57 pages, 59 figures
Published: 2008
Full Text: View/download PDF

42. Leptonic and Charged Kaon Decay Modes of theϕMeson Measured in Heavy-Ion Collisions at the CERN Super Proton Synchrotron

Author: Axel Maas, K. Filimonov, Y. Panebrattsev, S. Shimansky, J.P. Wurm, D. Antonczyk, Pavel Rehak, J. P. Wessels, J. Rak, S. Damjanovic, J. Holeczek, Ana Maria Marin, Peter Glassel, I. Ravinovich, Michal Sumbera, G. Hering, H. Tilsner, C. Garabatos, G. Agakichiev, Peter Braun-Munzinger, Jovan Milosevic, G. Tsiledakis, H. Appelshäuser, V. I. Yurevich, K. Fomenko, V. Petráček, L. Dietrich, V. Kushpil, S. Esumi, I. Tserruya, T. Wienold, Jurgen Schukraft, O. Petchenova, Dagmar Adamová, W. Schmitz, R. Ortega, Johanna Stachel, V. Belaga, Z. Fraenkel, A. Drees, G. Krobath, Hiroyuki Sako, A. Cherlin, W. Ludolphs, D. Miśkowiec, Jana Bielcikova, Oliver Busch, S. Yurevich, S. Sedykh, S. Radomski, and Thomas Dietel
Subjects: Quantum chromodynamics, Physics, Particle physics, Large Hadron Collider, Meson, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Phi meson, Super Proton Synchrotron, Nuclear physics, Yield (chemistry), Nuclear Physics - Experiment, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: We report a measurement of $\phi$ meson production in central Pb+Au collisions at E$_{lab}$/A=158 GeV. For the first time in heavy-ion collisions, $\phi$ mesons were reconstructed in the same experiment both in the K$^+$K$^-$ and the dilepton decay channel. Near mid-rapidity, this yields rapidity densities, corrected for production at the same rapidity value, of 2.05 +- 0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively. The shape of the measured transverse momentum spectra is also in close agreement in both decay channels. The data rule out a possible enhancement of the $\phi$ yield in the leptonic over the hadronic channel by a factor larger than 1.6 at 95% CL. We report a measurement of $\phi$ meson production in central Pb+Au collisions at E$_{lab}$/A=158 GeV. For the first time in heavy-ion collisions, $\phi$ mesons were reconstructed in the same experiment both in the K$^+$K$^-$ and the dilepton decay channel. Near mid-rapidity, this yields rapidity densities, corrected for production at the same rapidity value, of 2.05 +- 0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively. The shape of the measured transverse momentum spectra is also in close agreement in both decay channels. The data rule out a possible enhancement of the $\phi$ yield in the leptonic over the hadronic channel by a factor larger than 1.6 at 95% CL.
Published: 2006
Full Text: View/download PDF

43. Event-by-event fluctuations at SPS

Author: Michal Sumbera, J. Rak, V. Kushpil, H. Appelshäuser, Y. Panebrattsev, J.P. Wurm, D. Miśkowiec, V. I. Yurevich, Johanna Stachel, Alexander Milov, Jurgen Schukraft, S. Shimansky, I. Ravinovich, I. Tserruya, Axel Maas, L. Dietrich, Pavel Rehak, Z. Fraenkel, A. Castillo, Jovan Milosevic, K. Fomenko, S. Damjanović, Hiro Sako, Bernd Stefan Windelband, W. Schmitz, Andreas Pfeiffer, A. Drees, Peter Glassel, Peter Braun-Munzinger, C. Garabatos, S. Yurevich, T. Wienold, J. Slívová, H. Sako, Ana Maria Marin, H. Tilsner, S. I. Esumi, W. Ludolphs, B. Lenkeit, V. Petracek, V. V. Belaga, S. Sedykh, Johannes Peter Wessels, Wei Xie, K. Filimonov, G. Agakichiev, Dagmar Adamová, A. Cherlin, T. Dietel, O. Petchenova, J. Holeczek, and G. Hering
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Charge (physics), Nuclear physics, Cascade, Transverse momentum, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Centrality, Nuclear Experiment, Event (particle physics), Beam energy
Abstract: Results on event-by-event fluctuations of the mean transverse momentum and net charge in Pb-Au collisions, measured by the CERES Collaboration at CERN-SPS, are presented. We discuss the centrality and beam energy dependence and compare our data to cascade calculations., Comment: 4 pages, 4 figures, proceedings to INPC2004 Goteborg, Sweden
Published: 2004
Full Text: View/download PDF

44. Charged pion production in2Ato8AGeVcentralAu+AuCollisions

Author: James Alexander, S. Gushue, D. L. Olson, J. E. Draper, W. Caskey, H. G. Ritter, C. Law, M. Heffner, Lei Huo, Kenneth M. Crowe, W. N. Zhang, M. A. Lisa, C. Pinkenburg, R. P. Scharenberg, Russell Wells, H. Liu, N. N. Ajitanand, S. Y. Panitkin, J. Whitfield, J. Lauret, L. Wood, Brian Cole, J. L. Chance, D. Cebra, G. Odyniec, N. T. B. Stone, A. C. Das, E. Hjort, F. P. Brady, J. L. Klay, Roy A. Lacey, T. Wienold, N. T. Porile, T. Case, A. S. Hirsch, Morton Kaplan, R. L. McGrath, M. L. Gilkes, R. Witt, B. K. Srivastava, M. Justice, J. L. Romero, J. C. Kintner, Z. Milosevich, S. Wang, T. J. M. Symons, M. Anderson, D. Keane, P. Chung, Y. M. Liu, D. Best, David Krofcheck, and G. Rai
Subjects: Excitation function, Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Spectral line, Nuclear physics, Pion, 0103 physical sciences, Transverse mass, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract: Brookhaven-AGS. Measuerment of the spectra of charged pions over nearly full rapidity coverage from target to beam rapidity in the centrality range 0-5pct in AU-AU collisions at beam energies from 2 to 8 A GeV/nucleon. The rapidity densities are extracted using a thermal paramatrization model to fit the transverse mass spectra.. Numerical values supplied by J Klay.. This part (1) covers the data at 2 GeV/nucleon. Brookhaven-AGS. Measuerment of the spectra of charged pions over nearly full rapidity coverage from target to beam rapidity in the centrality range 0-5pct in AU-AU collisions at beam energies from 2 to 8 A GeV/nucleon. The rapidity densities are extracted using a thermal paramatrization model to fit the transverse mass spectra.. Numerical values supplied by J Klay.. This part (2) covers the data at 4 GeV/nucleon. Brookhaven-AGS. Measuerment of the spectra of charged pions over nearly full rapidity coverage from target to beam rapidity in the centrality range 0-5pct in AU-AU collisions at beam energies from 2 to 8 A GeV/nucleon. The rapidity densities are extracted using a thermal paramatrization model to fit the transverse mass spectra.. Numerical values supplied by J Klay.. This part (3) covers the data at 6.0 GeV/nucleon. Brookhaven-AGS. Measuerment of the spectra of charged pions over nearly full rapidity coverage from target to beam rapidity in the centrality range 0-5pct in AU-AU collisions at beam energies from 2 to 8 A GeV/nucleon. The rapidity densities are extracted using a thermal paramatrization model to fit the transverse mass spectra.. Numerical values supplied by J Klay.. This part (4) covers the data at 8.0 GeV/nucleon. Brookhaven-AGS. Measurement of the spectra of charged pions over nearly full rapidity coverage from target to beam rapidity in the centrality range 0-5pct in AU-AU collisions at beam energies from 2 to 8 A GeV/nucleon. The rapidity densities are extracted using a thermal paramatrization model to fit the transverse mass spectra.. Numerical values supplied by J Klay.. This part (5) covers the data Rapidiy density data.
Published: 2003
Full Text: View/download PDF

45. Event-by-event fluctuations of the mean transverse momentum in 40, 80, and 158 A GeV/c Pb-Au collisions

Author: A. Pfeiffer, M. Sumbera, W. Schmitz, V. Belaga, M. Richter, C. Garabatos, S. Sedykh, Jovan Milosevic, I. Tserruya, Peter Braun-Munzinger, O. Petchenova, G. Hering, A. Cherlin, P. Glässel, S. Yurevich, A. Drees, J. P. Wessels, H. J. Specht, D. Miskowiec, S. Shimansky, H. Sako, J. Rak, J. Schukraft, Alexander Milov, P. Rehak, R. Campagnolo, L. Musa, A. Castillo, T. Dietel, S. Damjanovic, D. Adamová, W. Ludolphs, J. Slívová, T. Wienold, B. Windelband, S.I. Esumi, L. Dietrich, W. Xie, K. Filimonov, Y. Panebrattsev, J.P. Wurm, V. Petrácek, A. Sharma, Axel Maas, Johanna Stachel, K. Fomenko, Z. Fraenkel, B. Lenkeit, V. Yurevich, H. Tilsner, A. Marín, G. Agakichiev, I. Ravinovich, H. Appelshäuser, V. Kushpil, W. Seipp, and J. Holeczek
Subjects: Nuclear reaction, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Extrapolation, FOS: Physical sciences, Charged particle, Nuclear physics, Critical point (thermodynamics), Quantum field theory, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), Nuclear Experiment, Phase diagram
Abstract: Measurements of event-by-event fluctuations of the mean transverse momentum in Pb-Au collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p_T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are somewhat smaller than recent measurements at RHIC. A possible non-monotonic behaviour of the mean p_T fluctuations as function of collision energy, which may have indicated that the system has passed the critical point of the QCD phase diagram in the range of mu_B under investigation, has not been observed. The centrality dependence of mean p_T fluctuations in Pb-Au is consistent with an extrapolation from pp collisions assuming that the non-statistical fluctuations scale with multiplicity. The results are compared to calculations by the RQMD and UrQMD event generators., 28 pages, 10 figures
Published: 2003

46. Near-threshold production of the multistrange Xi- hyperon

Author: L. Wood, A. C. Das, Michael W. Anderson, W. Holzmann, H. Liu, J. L. Klay, Roy A. Lacey, D. Best, M. Justice, J. L. Romero, A. S. Hirsch, M. Heffner, H. Oeschler, T. J. M. Symons, R. P. Scharenberg, B. Cole, Z. Milosevich, D. L. Olson, E. Hjort, W. Caskey, N. T. Porile, M. Issah, J. E. Draper, T. Case, A. Taranenko, G. Odyniec, Y. M. Liu, R. L. McGrath, N. N. Ajitanand, Lei Huo, J. Lauret, T. Wienold, F. P. Brady, M. L. Gilkes, Morton Kaplan, David Krofcheck, James Alexander, H. G. Ritter, Kenneth M. Crowe, W. N. Zhang, N. T. B. Stone, J. C. Kintner, S. Y. Panitkin, J. Milan, R. Witt, B. K. Srivastava, G. Rai, D. Keane, P. Chung, J. Whitfield, S. Gushue, J. L. Chance, D. Cebra, and M. A. Lisa
Subjects: Nuclear reaction, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Nuclear Theory, Hyperon, General Physics and Astronomy, heavy-ion collisions, nucleus-nucleus collisions, central pb+pb collisions, quark-gluon plasma, plus au collisions, pb-pb collisions, strangeness enhancement, energies, ags, equilibration, Lambda, Lambda baryon, 7. Clean energy, 01 natural sciences, Xi baryon, Nuclear physics, Baryon, 0103 physical sciences, 010306 general physics, Nuclear Experiment
Abstract: The yield for the multi-strange $\Xi^{-}$ hyperon has been measured in 6 AGeV Au+Au collisions via reconstruction of its decay products $\pi^{-}$ and $\Lambda$, the latter also being reconstructed from its daughter tracks of $\pi^{-}$ and p. The measurement is rather close to the threshold for $\Xi^{-}$ production and therefore provides an important test of model predictions. The measured yield for $\Xi^{-}$ and $\Lambda$ are compared for several centralities. In central collisions the $\Xi^{-}$ yield is found to be in excellent agreement with statistical and transport model predictions, suggesting that multi-strange hadron production approaches chemical equilibrium in high baryon density nuclear matter., Comment: Submitted to PRL
Published: 2003

47. Universal Pion Freeze-Out in Heavy-Ion Collisions

Author: V. Yurevich, V. Petracek, L. Dietrich, S. Yurevich, J. Schukraft, H. J. Specht, S. I. Esumi, S. Damjanovic, H. Tilsner, J. Slivova, S. Sedykh, I. Ravinovich, A. Marin, P. Glässel, I. Tserruya, K. Fomenko, H. Appelshäuser, A. Castillo, H. Sako, K. Filimonov, Z. Fraenkel, W. Ludolphs, A. Cherlin, Jovan Milosevic, P. Braun-Munzinger, O. Petchenova, J. Stachel, T. Dietel, B. Lenkeit, A. Drees, A. Milov, T. Wienold, Wenhui Xie, Andreas Pfeiffer, G. Agakichiev, G. Hering, B. Windelband, D. Miskowiec, J. Holeczek, Y. Panebrattsev, V. Kushpil, J.P. Wurm, C. Garabatos, J. Rak, D. Adamova, V. Belaga, W. Schmitz, P. Rehak, A. Maas, J. P. Wessels, M. Sumbera, and S. Shimansky
Subjects: Physics, Particle physics, Meson, Mean free path, Nuclear Theory, Hadron, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, Alternating Gradient Synchrotron, Nuclear physics, Pion, Path length, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract: Based on an evaluation of data on pion interferometry and on particle yields at mid-rapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda_f reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze-out. This critical mean free path is independent of the centrality of the collision and beam energy from AGS to RHIC., 5 pages, 3 figures, revised version resubmitted to PRL
Published: 2003
Full Text: View/download PDF

48. Beam energy and centrality dependence of two-pion Bose-Einstein correlations at SPS energies

Author: D. Adamová, G. Agakichiev, H. Appelshäuser, V. Belaga, P. Braun-Munzinger, R. Campagnolo, A. Castillo, A. Cherlin, S. Damjanović, T. Dietel, L. Dietrich, A. Drees, S.I. Esumi, K. Filimonov, K. Fomenko, Z. Fraenkel, C. Garabatos, P. Glässel, G. Hering, J. Holeczek, V. Kushpil, B. Lenkeit, W. Ludolphs, A. Maas, A. Marĺn, J. Milošević, A. Milov, D. Miśkowiec, L. Musa, Yu. Panebrattsev, O. Petchenova, V. Petráček, A. Pfeiffer, J. Rak, I. Ravinovich, P. Rehak, M. Richter, H. Sako, W. Schmitz, J. Schukraft, S. Sedykh, W. Seipp, A. Sharma, S. Shimansky, J. Slĺvová, H.J. Specht, J. Stachel, M. Šumbera, H. Tilsner, I. Tserruya, J.P. Wessels, T. Wienold, B. Windelband, J.P. Wurm, W. Xie, S. Yurevich, and V.V. Yurevich
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Bose–Einstein correlations, Radius, Function (mathematics), Collision, Nuclear physics, Interferometry, Pion, Thermal, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Centrality, Nuclear Experiment
Abstract: Results are presented of a two-pion interferometry (HBT) analysis in Pb+Au collisions at 40, 80, and 158 AGeV. A detailed study of the Bertsch-Pratt HBT radius parameters has been performed as function of the mean pair transverse momentum $k_t$ and in bins of the centrality of the collision. From these results we extract model dependent information about the space-time evolution of the reaction. An investigation of the effective volume of the pion emitting system provides an important tool to study the properties of thermal pion freeze-out., 24 pages, 16 figures, submitted to Nucl.Phys.A; minor changes as proposed by the referees: two short comments added, figure 6 caption changed, english style reviewed, references updated
Published: 2003

49. Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS

Author: J. Slívová, I. Ravinovich, W. Xie, A. Pfeiffer, K. Filimonov, Alexander Milov, T. Wienold, A. Cherlin, S.I. Esumi, L. Dietrich, A. Drees, J. Rak, A. Sharma, Z. Fraenkel, B. Lenkeit, H. Sako, H. Appelshäuser, I. Tserruya, Peter Braun-Munzinger, V. Kushpil, M. Richter, P. Glässel, S. Sedykh, H. Tilsner, V. Belaga, V. Yurevich, W. Seipp, J. P. Wessels, H. J. Specht, O. Petchenova, J. Holeczek, T. Dietel, G. Hering, D. Adamová, D. Miskowiec, Axel Maas, S. Yurevich, Johanna Stachel, A. Marín, K. Fomenko, G. Agakichiev, W. Schmitz, B. Windelband, M. Sumbera, C. Garabatos, Jovan Milosevic, S. Damjanovic, S. Shimansky, Y. Panebrattsev, J.P. Wurm, V. Petrácek, and P. Rehak
Subjects: Physics, Particle physics, Annihilation, Meson, Nuclear Theory, Hadron, FOS: Physical sciences, General Physics and Astronomy, Nuclear physics, Positron, Pair production, Pion, Antimatter, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Lepton
Abstract: We report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2 e+ e- annihilation with a modified rho-propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature., Comment: 4 pages, 3 figures final version as printed
Published: 2002

50. Centrality and momentum-selected elliptic flow: Tighter constraints for the nuclear equation of state

Author: P. Chung, N. N. Ajitanand, J. M. Alexander, J. Ames, M. Anderson, D. Best, F. P. Brady, T. Case, W. Caskey, D. Cebra, J. L. Chance, B. Cole, K. Crowe, A. C. Das, J. E. Draper, M. L. Gilkes, S. Gushue, M. Heffner, A. S. Hirsch, E. L. Hjort, W. Holzmann, L. Huo, M. Issah, M. Justice, M. Kaplan, D. Keane, J. C. Kintner, J. Klay, D. Krofcheck, R. A. Lacey, J. Lauret, M. A. Lisa, H. Liu, Y. M. Liu, J. Milan, R. McGrath, Z. Milosevich, G. Odyniec, D. L. Olson, S. Panitkin, N. T. Porile, G. Rai, H. G. Ritter, J. L. Romero, R. Scharenberg, L. Schroeder, B. Srivastava, N. T. B. Stone, T. J. M. Symons, J. Whitfield, T. Wienold, R. Witt, L. Wood, W. N. Zhang, and P. Danielewicz
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, Zero (complex analysis), Function (mathematics), Nuclear matter, Collision, 01 natural sciences, Constraint (information theory), Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: Proton elliptic flow is studied as a function of impact-parameter $b$, for two transverse momentum cuts in 2 - 6 AGeV Au + Au collisions. The elliptic flow shows an essentially linear dependence on b (for $1.5 < b < 8$ fm) with a negative slope at 2 AGeV, a positive slope at 6 AGeV and a near zero slope at 4 AGeV. These dependencies serve as an important constraint for discriminating between various equations of state (EOS) for high density nuclear matter, and they provide important insights on the interplay between collision geometry and the expansion dynamics. Extensive comparisons of the measured and calculated differential flows provide further evidence for a softening of the EOS between 2 and 6 GeV/nucleon.
Published: 2002
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Journal

Database

Publisher

81 results on '"T. Wienold"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources