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1. Study of the quasi-freenp→npπ+π−reaction with a deuterium beam at 1.25 GeV/nucleon

Author

S. Spataro, I. Fröhlich, J. Wüstenfeld, D. González-Díaz, J. S. Díaz, R. Holzmann, M. Böhmer, J. Markert, P. Cabanelas, A. Mangiarotti, Laura Fabbietti, P. Tlusty, B. Kämpfer, Kirill Lapidus, E. Schwab, A.P. Ierusalimov, T. Christ, A. Rustamov, V. P. Ladygin, A. Dybczak, Kathrin Göbel, Y. Parpottas, M. Gumberidze, Alexander Belyaev, T. Hennino, C. Sturm, T. Liu, S. Lang, A. Gil, J. L. Boyard, L. Lopes, Joachim Stroth, R. Krücken, Andrey Reshetin, A. K. Kurilkin, S. Yurevich, Y. C. Pachmayer, B. Michalska, A. B. Kurepin, M. Traxler, E. Morinière, I. Koenig, B. Ramstein, T. A. Vasiliev, O. V. Fateev, Tatiana Karavicheva, M. Lorenz, A. Schmah, W. Koenig, G. Agakishiev, Jehad Mousa, S. P. Chernenko, D. Belver, Volker Metag, P. Zhou, J. Michel, Paolo Finocchiaro, I. Iori, Witold Przygoda, O. Pechenova, H. Ströbele, A. Tarantola, Piotr Salabura, L. Naumann, L. Maier, V. Wagner, Yu.V. Zanevsky, J. Friese, T. Wojcik, F. Dohrmann, Wolfgang Kuhn, Fedor Guber, E. Castro, M. B. Golubeva, B. Spruck, C. Gilardi, A. Blanco, A. Balanda, P. Fonte, A. Ivashkin, R. Kotte, J. A. Garzón, V. Pechenov, Tetyana Galatyuk, R. Trebacz, J. S. Lange, Michael Weber, Roman Gernhäuser, A. Kugler, J. Pietraszko, M. Jurkovic, D. Kirschner, M. Destefanis, Yu. G. Sobolev, C. Müntz, A. Sadovsky, K. Teilab, Marek Palka, M. Wisniowski, H. Tsertos, Peter Braun-Munzinger, B. W. Kolb, J. Otwinowski, P. K. Kurilkin, and Filip Krizek

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Nuclear Theory, Resonance (particle physics), Nuclear physics, Deuterium, Isospin, Mass spectrum, Invariant mass, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The tagged quasi-free np→npπ+π- reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25 GeV/nucleon (s~2.42 GeV/c for the quasi-free collision). For the first time, differential distributions of solid statistics for π+π- production in np collisions have been collected in the region corresponding to the large transverse momenta of the secondary particles. The invariant mass and angular distributions for the np→npπ+π- reaction are compared with different models. This comparison confirms the dominance of the t-channel with δδ contribution. It also validates the changes previously introduced in the Valencia model to describe two-pion production data in other isospin channels, although some deviations are observed, especially for the π+π- invariant mass spectrum. The extracted total cross section is also in much better agreement with this model. Our new measurement puts useful constraints for the existence of the conjectured dibaryon resonance at mass M~2.38 GeV and with width Γ~70 MeV.

Published
2015

2. Production of in reactions at 3.5 GeV beam energy

Author

J. Otwinowski, P. Tlusty, Kirill Lapidus, A. Dybczak, J. C. Berger-Chen, A. Krása, Burkhard Kampfer, B. Spruck, A. M. Schmah, E. Schwab, S. Lang, A.P. Ierusalimov, T. Christ, A. Rustamov, I. Iori, B. Michalska, Michael Weber, Tatiana Karavicheva, T. Hennino, H. Kuc, B. W. Kolb, R. Holzmann, J. Markert, H. Ströbele, S. Yurevich, A. Tarantola, I. Koenig, C. Wendisch, Filip Krizek, V. Pechenov, Laura Fabbietti, V. Wagner, Y. C. Pachmayer, M. Gumberidze, M. Böhmer, A. Mangiarotti, S. P. Chernenko, Tetyana Galatyuk, J. S. Lange, A. Sadovsky, Andrey Reshetin, M. Lorenz, Volker Metag, Witold Przygoda, J. Michel, G. Agakishiev, W. Kühn, Marek Palka, Yu. G. Sobolev, R. H. Munzer, Fedor Guber, O. V. Fateev, C. Müntz, Y. Parpottas, Paolo Finocchiaro, O. Pechenova, K. Teilab, M. Destefanis, J. Friese, Yu.V. Zanevsky, D. González-Díaz, J. Pietraszko, D. Belver, T. Heinz, M. B. Golubeva, A. Balanda, C. Gilardi, Roman Gernhäuser, A. Kugler, A. Blanco, J. A. Garzón, M. Jurkovic, W. Koenig, L. Naumann, R. Trebacz, L. Maier, P. Fonte, K. Kanaki, A. Ivashkin, Jehad Mousa, R. Kotte, E. Castro, P. Salabura, Alexander Belyaev, F. Dohrmann, Eliane Epple, A. B. Kurepin, C. Sturm, B. Ramstein, J. Wüstenfeld, P. Cabanelas, J. Siebenson, J. L. Boyard, L. Lopes, Joachim Stroth, R. Krücken, E. Morinière, S. Spataro, I. Fröhlich, M. Traxler, R. Lalik, T. Liu, and H. Tsertos

Subjects
Physics, Nuclear and High Energy Physics, Angular distribution, 010308 nuclear & particles physics, 0103 physical sciences, Resonance, Production (computer science), Atomic physics, 010306 general physics, Kinetic energy, 01 natural sciences, Beam energy
Abstract

We study the production of Σ ± π ∓ p K + particle quartets in p + p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report evaluates the contribution of resonances like Λ ( 1405 ) , Σ ( 1385 ) 0 , Λ ( 1520 ) , Δ ( 1232 ) , N ⁎ and K ⁎ 0 to the Σ ± π ∓ p K + final state. The resulting simulation model is compared to the experimental data in several angular distributions and it shows itself as suitable to evaluate the acceptance corrections properly.

Published
2012

3. Study of dielectron production in C+C collisions at 1A GeV

Author

M. Roy-Stephan, R.S. Simon, P. Tlusty, Laura Fabbietti, J. S. Lange, E. Schwab, Tetyana Galatyuk, O. Pechenova, J. Pietraszko, A. B. Kurepin, M. Traxler, Filip Krizek, C. Sturm, A.P. Ierusalimov, A. M. Schmah, M. Weber, A. Gil, S. Spataro, R. Holzmann, J. Markert, E. Morinière, Y. Parpottas, Yu. G. Sobolev, D. Mishra, C. Müntz, H. Wen, Alexander Belyaev, D. González-Díaz, J. S. Díaz, Y. C. Pachmayer, S. Lang, Tatiana Karavicheva, Thomas Eberl, K. Lapidus, T. Christ, A. Dybczak, R. Novotny, Jehad Mousa, B. Michalska, P. Cabanelas, J. Lamas-Valverde, H. Alvarez-Pol, A. Rustamov, A. Krása, Andrey Reshetin, D. Belver, T. Perez Cavalcanti, Witold Przygoda, I. Koenig, A. Kozuch, A. Kugler, M. Sudol, T. Heinz, B. Spruck, R. Pleskac, P. Zhou, T. Hennino, C. Gilardi, Yu.V. Zanevsky, J. L. Boyard, M. Destefanis, A. Blanco, P. Fonte, V. Pospíšil, F. Dohrmann, A. Ivashkin, Paolo Finocchiaro, R. Kotte, A. Toia, A. Bortolotti, M. B. Golubeva, A. Balanda, S. Yurevich, J. Friese, T. Wojcik, Piotr Salabura, L. Lopes, L. Maier, V. Pechenov, Joachim Stroth, R. Krücken, E. Grosse, J. A. Garzón, I. Iori, B. Kämpfer, H. Ströbele, V. Wagner, B. W. Kolb, J. Otwinowski, B. Ramstein, B. Sailer, R. Trebacz, J. Marín, Kalliopi Kanaki, M. Münch, D. Kirschner, C. Schroeder, P. Zumbruch, E. Castro, O. V. Fateev, C. Agodi, R. Bassini, M. Heilmann, Roman Gernhäuser, M. Kajetanowicz, M. Jurkovic, Wolfgang Kuhn, H. Tsertos, Peter Braun-Munzinger, G. Bellia, I. Veretenkin, Fedor Guber, I. Fröhlich, A. Tarantola, M. Böhmer, A. Mangiarotti, S. P. Chernenko, Volker Metag, J. Wüstenfeld, G. Agakishiev, W. Koenig, L. Naumann, A. Sadovsky, K. Teilab, Marek Palka, and M. Wisniowski

Subjects
Excitation function, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Incident energy, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The emission of e+ e- pairs from C + C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the π0-Dalitz to the ρ / ω invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment. © 2008 Elsevier B.V. All rights reserved.

Published
2008

4. K*(892)+production in proton-proton collisions atEbeam=3.5GeV

Author

Filip Krizek, V. Metag, M. Lorenz, F.F. Guber, P. Tlusty, R. Holzmann, J. Markert, Kirill Lapidus, M. Böhmer, A. Mangiarotti, P. Cabanelas, B. W. Kolb, T. Hennino, J. L. Boyard, A. Lebedev, V. Pechenov, O. Svoboda, A. M. Schmah, S. P. Chernenko, J. Michel, Kathrin Göbel, J. Siebenson, E. Schwab, J. Friese, J. Wüstenfeld, Roman Gernhäuser, G. Kornakov, A. Sadovsky, A. Blanco, T. A. Vasiliev, M. Traxler, A. Kugler, P. Fonte, A. Ivashkin, A.P. Ierusalimov, H. Tsertos, R. Kotte, T. Kunz, A. Dybczak, V. P. Ladygin, B. Kämpfer, Oliver Werner Arnold, J. C. Berger-Chen, W. Kühn, H. Kuc, O. Pechenova, L. Naumann, M.B. Golubeva, H. Ströbele, M. Weber, O. V. Fateev, J. A. Garzón, A. Krása, A. Rustamov, Andrey Reshetin, C. Wendisch, Yu.V. Zanevsky, M. Gumberidze, M. Jurkovic, D. Belver, J. Pietraszko, V. Wagner, R. H. Munzer, D. M. Mihaylov, I. Koenig, S. Yurevich, Yiannis Parpottas, Yu. G. Sobolev, Alexey Kurepin, D. González-Díaz, L. Maier, C. Müntz, W. Koenig, C. Sturm, Witold Przygoda, T. Heinz, A. Tarantola, S. Spataro, I. Fröhlich, J. Stroth, G. Korcyl, R. Lalik, L. Lopes, R. Krücken, G. Agakishiev, Paolo Finocchiaro, Tatiana Karavicheva, P. Salabura, Laura Fabbietti, B. Spruck, I. Iori, Tetyana Galatyuk, Eliane Epple, Alexander Belyaev, Marek Palka, K. Teilab, Yvonne Chiara Pachmayer, and B. Ramstein

Subjects
Physics, Excitation function, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, 7. Clean energy, 01 natural sciences, Resonance (particle physics), Spectral line, Nuclear physics, Cross section (physics), Excited state, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Spin-½
Abstract

We present results on the K∗(892)+ production in proton-proton collisions at a beam energy of E=3.5 GeV, which is hitherto the lowest energy at which this mesonic resonance has been observed in nucleon-nucleon reactions. The data are interpreted within a two-channel model that includes the three-body production of K∗(892)+ associated with the Λ or Σ hyperon. The relative contributions of both channels are estimated. Besides the total cross section σ(p+p→K∗(892)++X)=9.5±0.9-0.9+1.1±0.7μb, which adds a new data point to the excitation function of the K∗(892)+ production in the region of low excess energy, transverse momenta and angular spectra are extracted and compared with the predictions of the two-channel model. The spin characteristics of K∗(892)+ are discussed as well in terms of the spin-alignment.

Published
2015

5. SubthresholdΞ−Production in Collisions ofp(3.5 GeV)+Nb

Author

S. P. Chernenko, Volker Metag, T. Heinz, J. Michel, O. Pechenova, J. Pietraszko, Laura Fabbietti, Yu.V. Zanevsky, D. González-Díaz, M. B. Golubeva, A. Balanda, Piotr Salabura, L. Naumann, P. Tlusty, Y. Parpottas, C. Wendisch, Kirill Lapidus, C. Müntz, A. Tarantola, L. Maier, Filip Krizek, B. Spruck, Eliane Epple, R. Müntzer, Yu. G. Sobolev, T. Hennino, H. Tsertos, A. M. Schmah, S. Yurevich, Y. C. Pachmayer, Kathrin Göbel, A. Lebedev, W. Kühn, G. Kornakov, P. Cabanelas, J. Stroth, B. Ramstein, Witold Przygoda, S. Lang, I. Koenig, V. Pechenov, D. Belver, Andrey Reshetin, M. Lorenz, H. Kuc, Tatiana Karavicheva, A. B. Kurepin, M. Traxler, Alexander Belyaev, T. A. Vasiliev, B. W. Kolb, J. Friese, O. V. Fateev, Tetyana Galatyuk, J. Siebenson, M. Böhmer, A. Mangiarotti, C. Sturm, W. Koenig, E. Schwab, A.P. Ierusalimov, B. Kämpfer, A. Rustamov, J. Wüstenfeld, R. Lalik, T. Liu, J. L. Boyard, L. Lopes, M. Gumberidze, Roman Gernhäuser, R. Krücken, R. Holzmann, J. Markert, G. Agakishiev, Paolo Finocchiaro, A. Kugler, V. P. Ladygin, B. Michalska, S. Spataro, I. Fröhlich, A. Dybczak, J. C. Berger-Chen, A. Krása, J. A. Garzón, A. Blanco, P. Fonte, M. Jurkovic, A. Ivashkin, R. Kotte, Fedor Guber, Oliver Werner Arnold, Michael Weber, R. Trebacz, I. Iori, H. Ströbele, V. Wagner, K. Teilab, Marek Palka, and A. Sadovsky

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Subthreshold conduction, Hyperon, General Physics and Astronomy, Heavy ion, 7. Clean energy, Beam energy
Abstract

Results on the production of the double strange cascade hyperon Ξ^{-} are reported for collisions of p(3.5 GeV)+Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Ξ^{-} production is observed in proton-nucleus interactions. Assuming a Ξ^{-} phase-space distribution similar to that of Λ hyperons, the production probability amounts to P_{Ξ^{-}}=[2.0±0.4(stat)±0.3(norm)±0.6(syst)]×10^{-4} resulting in a Ξ^{-}/(Λ+Σ^{0}) ratio of P_{Ξ^{-}}/P_{Λ+Σ^{0}}=[1.2±0.3(stat)±0.4(syst)]×10^{-2}. Available model predictions are significantly lower than the measured Ξ^{-} yield.

Published
2015

6. Coherent pion production in heavy ion charge exchange reactions

Author

R.A. Kunne, T. Hennino, J. L. Boyard, M. Roy-Stephan, M. Kagarlis, C. Gaarde, J.C. Jourdain, Clive Ellegaard, J. Jensen, B. Ramstein, Martin Drews, J.S. Larsen, Ronald Dahl, P. Radvanyi, P. Zupranski, L. Farhi, W. Augustyniak, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Carbon-12, 01 natural sciences, 7. Clean energy, Particle identification, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Ground state
Abstract

EI; We report the first observation of coherent pion production induced by a heavy ion charge exchange reaction. The ($^12$C,$^12$N) reaction [D. Bachelier et al., Phys. Lett. B 172 (1986) 23; M. Roy-Stephan et al., Nucl. Phys. A 488 (1988) 178] at 1.1 GeV/nucleon has been used to shine negative (off-shell) pions on nuclei and observe (on-shell) pions, leaving the target nucleus in its ground state. The experiment was performed at the Laboratoire National Saturne with the SPES4$_\pi$ setup [Laurent Farhi PHD thesis IPNO-T97-12, Universite d'Orsay, 1997; Rasmus Dahl Ph.D., Niels Bohr Institutet, Copenhagen (1999)].

Published
2005

7. Di-electron measurements in C+C reactions at with HADES

Author

M. Jaskula, Y. C. Pachmayer, R. Holzmann, J. Markert, L.M. Pant, J. A. Garzón, C. Maiolino, Tatiana Karavicheva, V. T. Smolyankin, B. Ramstein, I. Iori, I. Fröhlich, J. Mousa, James Ritman, Jaroslav Bielcik, Joachim Stroth, R. Krücken, Roman Gernhäuser, M. Jurkovic, Paolo Finocchiaro, J. L. Boyard, O. V. Fateev, C. Agodi, F. Dohrmann, Piotr Salabura, B. Kämpfer, R. Novotny, Yu.V. Zanevsky, H. Alvarez-Pol, R. Djeridi, T. Pérez, G. Agakishiev, Piera Sapienza, S. Hlavac, A.P. Ierusalimov, R. Pleskac, Laura Fabbietti, M. Münch, G. Bellia, J. Novotný, Wolfgang Kuhn, R.S. Simon, M. Sánchez, I. Koenig, A. Toia, T. Christ, A. Rustamov, F. Guber, M. Wiśniowski, A. Sadovsky, P. Tlustý, V. Pospíšil, C. Sturm, S. P. Chernenko, Volker Metag, M. Roy-Stephan, M. B. Golubeva, N. Rabin, P. Zumbruch, T. Hennino, A. B. Kurepin, R. Kulessa, M. Böhmer, D. González-Díaz, A. Kugler, R. Coniglione, A. Balanda, R. Kotte, M. Traxler, B. Sailer, J. Kotulic-Bunta, V. Wagner, M. Sudol, J. Wüstenfeld, E. Grosse, B. W. Kolb, J. Otwinowski, Kalliopi Kanaki, Thomas Eberl, H. Tsertos, Peter Braun-Munzinger, W. Koenig, L. Naumann, V. Pechenov, H. Stroebele, C. Müntz, L. Smykov, I. Duran, J. Pietraszko, A. M. Schmah, S. Spataro, S. Lang, Andrey Reshetin, B. Spruck, J. Lehnert, J. Friese, T. Wojcik, D. Žovinec, and Witold Przygoda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, 010308 nuclear & particles physics, Hadron, Detector, Electron, Invariant (physics), Nuclear matter, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Analysis method
Abstract

The High Acceptance DiElectron Spectrometer HADES has been recently commissioned at GSI, Darmstadt. It has been designed for systematic studies of hadron properties inside nuclear matter. We report first preliminary results on invariant masses e + e - -pairs which were measured in 12 C + 12 C collisions at E kin = 2 GeV ⋅ A . The analysis methods are briefly outlined and a comparison with detailed Monte-Carlo simulations is shown.

Published
2005

8. 2H( 3He, t)2p reaction at 2 GeV

Author

Ronald Dahl, Clive Ellegaard, J.S. Larsen, D. L'Hote, J.C. Jourdain, J. Poitou, M. Skousen, M. Roy-Stephan, J. L. Boyard, T. Hennino, H.P. Morsch, MC Lemaire, P. Zupranski, Michael Österlund, C. Gaarde, H.G. Bohlen, S Tarle-Rousteau, C. A. Mosbacher, W. Augustyniak, D. Bachelier, B. Ramstein, P. Radvanyi, Thomas Sams, and J. Gosset

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Hadron, Spectral line, Nuclear physics, Pion, Yield (chemistry), Nuclear fusion, Center of mass, Atomic physics, Nuclear Experiment, Legendre polynomials, Excitation
Abstract

The exclusive 2H( 3He, t)2p reaction has been studied at 2 GeV for energy transfers up to 500 MeV and triton angles up to 3.4°. The protons were measured in the large acceptance magnetic detector DIOGENE, in coincidence with the forward tritons detected in a dedicated magnetic arm. The energy transfer spectra extend well above the pion threshold. However, in the region of Δ excitation, the yield is less than 10% of the inclusive 2H( 3He, t) cross-section, which indicates the small contribution of the ΔN ↦ NN process. The angular distributions of the two protons in their center of mass have been analysed as a function of energy transfer and triton angle and a Legendre polynomial decomposition has been achieved. These data have been compared to a model based on a coupled-channel approach for describing the NN and NΔ systems.

Published
2003

9. Development of low-mass drift chambers for the HADES spectrometer

Author

A Petrov, Yu.V. Zanevsky, Joachim Stroth, Manfred Sobiella, L. Smykov, W. Koenig, F. Dohrmann, P Zumbruch, S. P. Chernenko, J Kempter, O. V. Fateev, J. Wüstenfeld, E. Grosse, J. Pouthas, H. Daues, Wolfgang Enghardt, P. Rosier, C. Garabatos, J L Boyard, L. Naumann, C. Müntz, L. Glonti, H. Bokemeyer, H. Stelzer, V. F. Chepurnov, J. Hehner, T. Hennino, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Toroid, Meson, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 7. Clean energy, 01 natural sciences, Charged particle, Particle detector, Nuclear physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Instrumentation, Event (particle physics), Beam (structure)
Abstract

The High Acceptance Di-Electron Spectrometer (HADES) is a detector arrangement combined with a superconducting toroid for lepton pair spectroscopy presently built up at GSI (Darmstadt). HADES is designed to cope with the high-multiplicity environment of heavy ion collisions at 1AGeV and intensities of up to 108 beam particles per second and central event rates of 105 s-1. The detector has a geometrical acceptance of almost 50% for e+e- pairs and a mass resolution of 0.8% for ρ and ω mesons. Four low-mass drift chamber systems, two before and two behind the magnet, serve for charged particle track reconstruction. Design aspects of the drift chambers and first results from beam tests are presented.

Published
2002

10. AssociateK0production inp+pcollisions at 3.5 GeV: The role ofΔ(1232)++

Author

Yu. G. Sobolev, C. Müntz, G. Kornakov, I. Koenig, B. Spruck, B. Kämpfer, Filip Krizek, E. Schwab, T. Kunz, A. Sadovsky, Alexander Belyaev, I. Iori, A.P. Ierusalimov, H. Ströbele, M.B. Golubeva, A. Dybczak, M. Gumberidze, V. Wagner, J. L. Boyard, J. C. Berger-Chen, A. Krása, Andrey Reshetin, T. Heinz, A. Rustamov, R. H. Munzer, L. Lopes, R. Krücken, P. Tlusty, P. Cabanelas, Kirill Lapidus, V. P. Ladygin, B. W. Kolb, A. M. Schmah, Kathrin Göbel, Yiannis Parpottas, J. Siebenson, Alexey Kurepin, D. González-Díaz, C. Sturm, B. Ramstein, A. Tarantola, J. A. Garzón, Eliane Epple, M. Jurkovic, Marc Weber, V. Metag, T. A. Vasiliev, M. Lorenz, K. Teilab, G. Agakishiev, W. Kühn, H. Tsertos, Paolo Finocchiaro, J. Stroth, F.F. Guber, Roman Gernhäuser, M. Böhmer, A. Mangiarotti, A. Kugler, Yvonne Chiara Pachmayer, D. Belver, C. Wendisch, Marek Palka, J. Friese, T. Galatyuk, G. Korcyl, S. Yurevich, R. Lalik, L. Maier, P. Salabura, I. Fröhlich, O. V. Fateev, Witold Przygoda, T. Hennino, R. Holzmann, J. Markert, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, Tatiana Karavicheva, Laura Fabbietti, Oliver Werner Arnold, H. Kuc, L. Naumann, O. Pechenova, J. Pietraszko, S. P. Chernenko, V. Pechenov, J. Michel, A. Lebedev, J. Wüstenfeld, M. Traxler, W. Koenig, and Yu.V. Zanevsky

Subjects
Physics, Nuclear physics, Event selection, Nuclear and High Energy Physics, Angular distribution, Phase space, Mass spectrum, Invariant mass, Production (computer science), Atomic physics, Kinetic energy
Abstract

An exclusive analysis of the four-body final states Λ+p+π++K0 and Σ0+p+π++K0 measured with HADES for p+p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four-particle event selection (p,π+,π+,π-) to find cross sections of the different production channels, contributions of the intermediate resonances Δ++ and Σ(1385)+, and corresponding angular distributions. A dominant resonant production is seen, where the reaction Λ+Δ+++K0 has a cross section about ten times higher (29.45±0.08-1.46+1.67±2.06μb) than the analogous nonresonant reaction (2.57±0.02-1.98+0.21±0.18μb). A similar result is obtained in the corresponding Σ0 channels with 9.26±0.05-0.31+1.41±0.65μb in the resonant and 1.35±0.02-1.35+0.10±0.09μb in the nonresonant reactions. © 2014 American Physical Society.

Published
2014

11. Inclusive 2(3He,t) reaction at 2 GeV

Author

J.C. Jourdain, Clive Ellegaard, C. Gaarde, J. L. Boyard, C. D. Goodman, C. A. Mosbacher, T. Hennino, J. Larsen, Peter Ekström, A. Brockstedt, D. Bachelier, B. Ramstein, P. Radvanyi, M. Boivin, Ronald Dahl, Lars Carlén, M. Roy-Stephan, and I. Berquist

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pion, Scattering, Projectile, Energy transfer, Hadron, Nuclear fusion, Atomic physics, Nuclear Experiment, Excitation, Spectral line
Abstract

The inclusive 2(3He,t) reaction has been studied at 2 GeV for energy transfers up to 500 MeV and scattering angles from 0.250 up to 40. Data are well reproduced by a model based on a coupled-channel approach for describing the NN and NΔ systems. The effect of final state interaction is important in the low energy part of the spectra. In the delta region, the cross-section is very sensitive to the effects of Δ-N interaction and ΔN → NN process. The latter has also a large influence well below the pion threshold. The calculation underestimates the experimental cross-section between the quasi-elastic and the delta peaks; this is possibly due to projectile excitation or purely mesonic exchange currents.

Published
1999

12. Spallation neutron spectra measurements Part II: Proton recoil spectrometer

Author

F. Boué, F. Plouin, M. Uematsu, Alain Boudard, S. Ménard, Philippe Bouyer, Ludwik Kowalski, S. Vuillier, J.P. Lochard, D.M. Whittal, Y. Terrien, S. Crespin, Sylvie Leray, J.C. Duchazeaubeneix, D. Drake, J. Fréhaut, G. Milleret, R. Legrain, F. Brochard, J. L. Boyard, Esteban Martínez, J.M. Durand, M. Beau, E. Petibon, Y. Patin, J.E. Thun, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Scintillator, Neutron scattering, 7. Clean energy, 01 natural sciences, Neutron time-of-flight scattering, Nuclear physics, Recoil, Deuterium, 0103 physical sciences, Neutron, Spallation, Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

We present the experimental method conceived to measure high energy neutrons in the range (200 ≤ E ≤ 1600 MeV). The neutrons produce recoil protons in a liquid hydrogen converter. Momentum evaluation and identification of these protons are made by using a magnetic spectrometer equipped with plastic scintillators and three double-plane ( X - Y ) wire chambers. The response functions of the apparatus are determined using quasi-monoenergetic neutron beams produced by the break-up of deuterons or 3 He on a Be target. The performance of the apparatus is illustrated in the form of a preliminary neutron spectrum.

Published
1997

13. Spallation neutron spectra measurements Part I: Time-of-flight technique

Author

Alain Boudard, Philippe Bouyer, Y. Patin, Sylvie Leray, S. Vuillier, G. Milleret, S. Crespin, S. Ménard, J.C. Duchazeaubeneix, J. L. Boyard, Esteban Martínez, F. Boué, F. Plouin, J. Fréhaut, R. Legrain, M. Uematsu, Y. Terrien, Ludwik Kowalski, M. Beau, F. Brochard, D.M. Whittal, J.P. Lochard, E. Petibon, D. Drake, J.M. Durand, J.E. Thun, F. Borne, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Robert, Suzanne

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Scintillator, Neutron scattering, Neutron radiation, 7. Clean energy, 01 natural sciences, Neutron temperature, law.invention, Nuclear physics, law, 0103 physical sciences, Neutron cross section, Van de Graaff generator, Physics::Accelerator Physics, Neutron source, Spallation, Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

We present an experimental method based on a time-of-flight technique between the tagged incident particles and a thick liquid NE213 scintillator to measure neutron energy spectra from 3 to 400 MeV at the Saturne synchrotron of Saclay. Efficiency measurements are made using a pulsed neutron source from the Tandem Van de Graaff of Bruyeres-le-Châtel at low energies and a quasi-monoenergetic neutron beam at Saturne up to 50 MeV.

Published
1997

14. Inclusive pion andηproduction inp+Nb collisions at 3.5 GeV beam energy

Author

M.B. Golubeva, B. Spruck, Yu.V. Zanevsky, J. A. Garzón, P. Tlusty, Kirill Lapidus, Andrey Reshetin, M. Jurkovic, A. M. Schmah, C. Wendisch, Kathrin Göbel, I. Koenig, Laura Fabbietti, A. Balanda, S. Lang, R. Trebacz, F.F. Guber, S. Spataro, H. Ströbele, K. Teilab, S. Yurevich, Yu. G. Sobolev, B. Kämpfer, I. Iori, G. Agakishiev, C. Sturm, I. Fröhlich, M. Böhmer, A. Mangiarotti, V. Wagner, C. Müntz, J. L. Boyard, V. Metag, M. Lorenz, T. Heinz, E. Epple, Paolo Finocchiaro, Yvonne Chiara Pachmayer, Alexander Belyaev, V. P. Ladygin, L. Maier, R. Holzmann, J. Markert, M. Gumberidze, B. W. Kolb, J. Stroth, J. Friese, T. Hennino, W. Koenig, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, Roman Gernhäuser, H. Kuc, G. Kornakov, O. V. Fateev, A. Kugler, Yiannis Parpottas, Tatiana Karavicheva, L. Naumann, V. Pechenov, P. Cabanelas, Alexey Kurepin, D. González-Díaz, Marc Weber, W. Kühn, P. Salabura, H. Tsertos, A. Tarantola, Tetyana Galatyuk, R. Lalik, T. Liu, A. Lebedev, B. Ramstein, L. Lopes, S. P. Chernenko, Filip Krizek, R. Krücken, A. Dybczak, D. Belver, J. Michel, J. C. Berger-Chen, J. Wüstenfeld, M. Traxler, A. Krása, J. Siebenson, T. A. Vasiliev, Witold Przygoda, O. Pechenova, Marek Palka, E. Schwab, A. Sadovsky, J. Pietraszko, A.P. Ierusalimov, B. Michalska, and A. Rustamov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Transport theory, Kinetic energy, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Production (computer science), Nuclear Experiment, 010306 general physics, Beam energy, Energy (signal processing)
Abstract

Data on inclusive pion and $\ensuremath{\eta}$ production measured with the dielectron spectrometer HADES in the reaction $p+{}^{93}\mathrm{Nb}$ at a kinetic beam energy of 3.5 GeV are presented. Our results, obtained with the photon-conversion method, supplement the rather sparse information on neutral-meson production in proton-nucleus reactions existing for this bombarding energy regime. The reconstructed ${e}^{+}{e}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}}$ transverse-momentum and rapidity distributions are confronted with transport-model calculations, which account fairly well for both ${\ensuremath{\pi}}^{0}$ and $\ensuremath{\eta}$ production.

Published
2013

15. Quasifree (d→,2He) data

Author

Vladimir Dmitriev, P. Zupranski, Clive Ellegaard, C. D. Goodman, M. Osterlund, T. Hennino, B. Ramstein, C. Gaarde, A. Brockstedt, J. L. Boyard, J. C. Jourdain, M. Roy-Stephan, Munetake Ichimura, P. Radvanyi, J.S. Larsen, and Thomas Sams

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Light nucleus, Nuclear Theory, Polarization observables, Tensor, Atomic physics, Nuclear Experiment, Isotopes of helium
Abstract

Experimental data on the nuclear spin-isospin response in the quasifree region, measured with the charge-exchange reaction (d\ensuremath{\rightarrow},2p${[}^{1}$${\mathit{S}}_{0}$]) at Laboratoire National Saturne, are presented. The use of a tensor-polarized beam enables us to separate the tensor analyzing powers ${\mathit{T}}_{20}$ and ${\mathit{T}}_{22}$. The present publication is intended to serve as a compilation of the complete set of quasifree data with the (d\ensuremath{\rightarrow}${,}^{2}$He) reaction at 1.6 GeV bombarding energy. Data for $^{12}\mathrm{C}$ are compared to calculated cross sections and tensor-analyzing powers. The cross section in the high-energy end of the quasielastic peak is underestimated, whereas the polarization observables are reasonably well reproduced. The distortion effects are, however, found to be large, suggesting that the (d\ensuremath{\rightarrow}${,}^{2}$He) reaction is not sensitive to spin correlations in the continuum.

Published
1995

16. Dissipative aspects in projectile fragmentation at 200 MeV/u

Author

D. Bachelier, D. Disdier, Dominique Bazin, F. Clapier, C. Grunberg, L. Tassan-Got, M.F. Rivet, C. Volant, C.O. Bacri, B. Borderie, R. Bimbot, T. Hennino, B. Lott, C. Stephan, J. L. Boyard, P. Roussel, C. Donzaud, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Evaporation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Dissipation, 01 natural sciences, Ion, Momentum, Nuclear physics, Recoil, Isospin, 0103 physical sciences, Dissipative system, Atomic physics, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Excitation, Nuclear Physics
Abstract

Peripheral collisions involving heavy ions at relativistic energies have been extensively studied for the last years. Such reactions lead to generally hot fragments [1,2], however the excitation energy is subject to large fluctuations and can reach low values [3]. The study of the energy dissipation, its coupling to other quantities such as the isospin and momentum of fragments are of interest because they carry information on the underlying mechanism, governing to a large extent production yields. Up to now this excitation energy has been essentially assessed from the effect of the evaporation stage on the N Z ratio of fragments [1,2]. We report in this contribution on a direct measurement, in coincidence with heavy fragments, of particles which mainly come from the deexcitation stage of the quasi-projectile. This type of measurement provides information not only on the mean deposited energy, but also on the excitation spectrum. The experimental results will be discussed in view of two questions: are neutron-rich isotopes produced either by fluctuations in the energy deposition (low energy tail) or by fluctuations in the decay stage for hot primary fragments? Does a Glodhaber-type mechanism [4] (recoil effects) fully accounts for the width of the longitudinal momentum spectrum?

Published
1995

17. Baryonic resonances close to theK¯Nthreshold: The case ofΣ(1385)+inppcollisions

Author

T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, Marek Palka, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, B. Kämpfer, W. Kühn, L. Lopes, J. A. Garzón, I. Koenig, R. Krücken, Yu.V. Zanevsky, Tatiana Karavicheva, E. Schwab, M. Jurkovic, M. Gumberidze, Laura Fabbietti, D. Belver, A. Sadovsky, B. Ramstein, F. Dohrmann, R. Trebacz, V. Pechenov, Andrey Reshetin, Alexander Belyaev, C. Sturm, A.P. Ierusalimov, H. Kuc, A. Balanda, K. Teilab, J. S. Lange, R. H. Munzer, S. Spataro, I. Fröhlich, R. Holzmann, J. Markert, L. Naumann, M. Weber, H. Ströbele, B. Spruck, W. Koenig, Yvonne Chiara Pachmayer, A. Dybczak, T. Galatyuk, J. C. Berger-Chen, T. Christ, C. Wendisch, V. Wagner, Eliane Epple, Jehad Mousa, O. Pechenova, L. Maier, A. Krása, S. P. Chernenko, A. Rustamov, J. Michel, J. Pietraszko, M. Destefanis, T. Heinz, I. Iori, J. Wüstenfeld, J. Stroth, Yiannis Parpottas, Roman Gernhäuser, A. Kugler, S. Yurevich, E. Morinière, Yu. G. Sobolev, Alexey Kurepin, D. González-Díaz, P. Cabanelas, C. Müntz, Kalliopi Kanaki, H. Tsertos, V. Metag, O. V. Fateev, M. Traxler, M. Lorenz, R. Lalik, T. Liu, M.B. Golubeva, P. Tlusty, B. W. Kolb, Kirill Lapidus, J. Siebenson, A. M. Schmah, E. Castro, P. Salabura, Filip Krizek, S. Lang, J. L. Boyard, G. Agakishiev, Paolo Finocchiaro, J. Friese, B. Michalska, Witold Przygoda, F.F. Guber, M. Böhmer, A. Mangiarotti, and A. Tarantola

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hyperon, Sigma, 01 natural sciences, Baryon, Angular distribution, 0103 physical sciences, Production (computer science), Invariant mass, Atomic physics, 010306 general physics, Beam energy, Bar (unit)
Abstract

We present results of an exclusive measurement of the first-excited state of the $\ensuremath{\Sigma}$ hyperon, $\ensuremath{\Sigma}{(1385)}^{+}$, produced in $p+p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}+{K}^{+}+n$ at $3.5\phantom{\rule{0.28em}{0ex}}\mathrm{GeV}$ beam energy. The extracted data allow the detailed study of the invariant mass distribution of the $\ensuremath{\Sigma}{(1385)}^{+}$. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at ${m}_{0}=1383.2\ifmmode\pm\else\textpm\fi{}0.9\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$ and a width of $40.2\ifmmode\pm\else\textpm\fi{}2.1\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$. The exclusive production cross section comes out to be $22.27\ifmmode\pm\else\textpm\fi{}0.89\ifmmode\pm\else\textpm\fi{}1.{56}_{\ensuremath{-}2.10}^{+3.07}\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}b$. Angular distributions of the $\ensuremath{\Sigma}{(1385)}^{+}$ in different reference frames are found to be compatible with the hypothesis that $33%$ of $\ensuremath{\Sigma}{(1385)}^{+}$ result from the decay of an intermediate broad ${\ensuremath{\Delta}}^{++}$ excitation at about $2000\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$.

Published
2012

18. Determination of the Σ(1385)0/Λ(1405) ratio in p+p collisions at 3.5 GeV

Author

E. Schwab, O. V. Fateev, M. Lorenz, A. Dybczak, S. P. Chernenko, Volker Metag, J. Michel, J. C. Berger-Chen, A.P. Ierusalimov, Michael Weber, M. Böhmer, Y. V. Zanevsky, A. Krása, A. Sadovsky, A. B. Kurepin, I. Iori, H. Kuc, V. Pechenov, C. Wendisch, M. B. Golubeva, A. Balanda, J. A. Garzón, Alexander Belyaev, S. Yurevich, R. Gernhäuser, J. S. Lange, Marek Palka, E. Castro, J. Friese, T. Christ, A. Rustamov, Burkhard Kampfer, E. Morinière, Yu. G. Sobolev, Fedor Guber, I. Koenig, Tatiana Karavicheva, D. González-Díaz, L. Fabbietti, Y. Parpottas, Wolfgang Kuhn, R. Holzmann, J. Markert, I. Fröhlich, Luis Lopes, A. Kugler, M. Jurkovic, V. Wagner, H. Ströbele, A. Mangiarotti, D. Belver, C. Gilardi, Jacek Tomasz Otwinowski, J. Pietraszko, Andrey Reshetin, C. Sturm, B. W. Kolb, T. Heinz, Witold Przygoda, P. Fonte, R. Trebacz, Yvonne Chiara Pachmayer, O. Pechenova, J. L. Boyard, T. Hennino, A. Ivashkin, R. Kotte, M. Traxler, C. Müntz, B. Spruck, G. Agakishiev, F. Krizek, E. Epple, F. Dohrmann, Piotr Salabura, Paolo Finocchiaro, S. Spataro, L. Naumann, Kalliopi Kanaki, P. Cabanelas, L. Maier, A. Tarantola, A. Blanco, Tetyana Galatyuk, B. Ramstein, W. Koenig, Joachim Stroth, R. Krücken, Jehad Mousa, M. Gumberidze, J. Siebenson, M. Destefanis, H. Tsertos, P. Tlusty, Kirill Lapidus, J. Wüstenfeld, R. Lalik, K. Teilab, T. Liu, A. M. Schmah, S. Lang, and B. Michalska

Subjects
Physics, Sigma, Production (computer science), Atomic physics, Lambda
Abstract

The aim of the present analysis is to determine the relative production cross sections of the Λ(1405) and Σ(1385)0 resonances in p+p collisions at Ekin = 3.5 GeV measured with HADES. Upper and lower limits have been determined for the ratio \(\sigma_{(\Sigma(1385)^{0}+p+K^{+})}/\sigma_{(\Lambda(1405)+p+K^{+})}=0.76_{-0.26}^{+0.54}\). The knowledge of this ratio is an essential input for the analysis of the decay Λ(1405)→Σ± π ∓ , where an unambiguous separation of the Λ(1405) and Σ(1385)0 signals is not possible.

Published
2012

19. Probing properties of nuclear matter with HADES

Author

Yu.V. Zanevsky, S. P. Chernenko, J. Michel, T. A. Vasiliev, A. Sadovsky, J. Wüstenfeld, J. Friese, A.P. Ierusalimov, A. Dybczak, H. Kuc, B. Kämpfer, L. Naumann, M. Weber, A. Balanda, T. Galatyuk, R. Holzmann, J. Markert, A. Rustamov, A. Krása, Andrey Reshetin, M. Gumberidze, J. Stroth, L. Maier, Marek Palka, P. Cabanelas, A. Tarantola, O. V. Fateev, A. Kugler, K. Teilab, V. Pechenov, B. Michalska, J. Lamas-Valverde, A. K. Kurilkin, J. Siebenson, B. W. Kolb, W. Kühn, Yvonne Chiara Pachmayer, T. Liu, S. Yurevich, P. Tlusty, Kirill Lapidus, Tatiana Karavicheva, G. Agakishiev, R. Krücken, Grzegorz Korcyl, D. Belver, I. Koenig, A. Kozuch, V. Metag, A. M. Schmah, O. Pechenova, Paolo Finocchiaro, H. Tsertos, M. Lorenz, Witold Przygoda, L. Lopes, B. Ramstein, F.F. Guber, H. Ströbele, P. K. Kählitz, S. Lang, W. Koenig, M. Böhmer, A. Mangiarotti, Laura Fabbietti, V. Wagner, J. Roskoss, Ana M. Gil, J. Pietraszko, S. Spataro, I. Fröhlich, T. Hennino, Yiannis Parpottas, J. A. Garzón, Eliane Epple, M.B. Golubeva, Alexey Kurepin, D. González-Díaz, J. S. Díaz, M. Jurkovic, A. Blanco, P. Fonte, Yu. G. Sobolev, R. Trebacz, A. Ivashkin, R. Kotte, C. Müntz, Alexander Belyaev, M. Traxler, P. K. Kurilkin, Filip Krizek, E. Castro, P. Salabura, V. P. Ladygin, J. L. Boyard, G. Kornakov, C. Sturm, I. Iori, and P. Huck

Subjects
Physics, Nuclear physics, Particle physics, Nuclear matter
Abstract

G. Agakishiev6, A. Balanda3, D. Belver16, A. Belyaev6, A. Blanco2, M. Bohmer9, J. L. Boyard14, P. Cabanelas16, E. Castro16, S. Chernenko6, J. Diaz17, A. Dybczak3, E. Epple8, L. Fabbietti8, O. Fateev6, P. Finocchiaro1, P. Fonte2,b, J. Friese9, I. Frohlich7, T. Galatyuk7,c, J. A. Garzon16, A. Gil17, M. Golubeva12, D. Gonzalez-Diazd , F. Guber12, M. Gumberidze14, T. Hennino14, R. Holzmann4, P. Huck9, A. Ierusalimov6, I. Iori11, f , A. Ivashkin12, M. Jurkovic9, B. Kampfer5,e, T. Karavicheva12, I. Koenig4, W. Koenig4, B. W. Kolb4, G. Korcyl3, G. Kornakov16, R. Kotte5, A. Kozuch3,g, A. Krasa15, F. Krizek15, R. Krucken9, H. Kuc3,14, W. Kuhn10, A. Kugler15, A. Kurepin12, A. Kurilkin6, P. Kurilkin6, P. Kahlitz5, V. Ladygin6, J. Lamas-Valverde16, S. Lang4, K. Lapidus8, T. Liu14, L. Lopes2, M. Lorenz7, L. Maier9, A. Mangiarotti2, J. Markert7, V. Metag10, B. Michalska3, J. Michel7, C. Muntz7, L. Naumann5, Y. C. Pachmayer7, M. Palka7, Y. Parpottas13, V. Pechenov4, O. Pechenova7, J. Pietraszko7, W. Przygoda3, B. Ramstein14, A. Reshetin12, J. Roskoss10, A. Rustamov4, A. Sadovsky12, P. Salabura3, A. Schmaha, J. Siebenson8, Yu.G. Sobolev15, S. Spataroh, H. Strobele7, J. Stroth7,4, C. Sturm4, A. Tarantola7, K. Teilab7, P. Tlusty15, M. Traxler4, R. Trebacz3, H. Tsertos13, T. Vasiliev6, V. Wagner15, M. Weber9, J. Wustenfeld5, S. Yurevich4, Y. Zanevsky6 (HADES collaboration)

Published
2011

20. Measurement of tensor polarization of deuterons from3He→d+pbreakup at momenta from 4.60 to 5.66 GeV/c

Author

L. V. Malinina, J. Ball, J.-L. Sans, R. Gacougnolle, R.A. Kunne, J. L. Boyard, L. Bimbot, E. Tomasi-Gustafsson, E. A. Strokovsky, V. A. Punjabi, S. Nedev, P. Courtat, L. B. Golovanov, J. Yonnet, R. Skowron, I.M. Sitnik, C. F. Perdrisat, N.M. Piskunov, Y. Bisson, M. K. Jones, Yu. T. Borzunov, M. Boivin, and T. Hennino

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, Few-body systems, 01 natural sciences, 7. Clean energy, Nuclear physics, Baryon, Helium-3, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium
Abstract

The tensor polarization ${\ensuremath{\rho}}_{20}$ of deuterons emitted in the ${}^{1}\mathrm{H}{(}^{3}\mathrm{He},\stackrel{\ensuremath{\leftrightarrow}}{d})X$ reaction at ${0}^{\ensuremath{\circ}}$ in the laboratory system was measured at the Saturne National Laboratory in Saclay using the SPES-4 spectrometer with the HYPOM polarimeter located downstream from its focal plane. The momentum of the detected deuterons was kept fixed at 3.77 GeV$/c$, while the momentum of the ${}^{3}\mathrm{He}$ beam was varied from 4.60 to 5.66 GeV$/c$, thus providing a range of internal momenta $k$ of the deuteron in ${}^{3}\mathrm{He}$ from 0 up to 0.4 GeV$/c$. The data obtained are compared with theoretical predictions.

Published
2011

21. pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV

Author

Marek Palka, M. Wisniowski, B. Sailer, A. Schmah, I. Iori, C. Gilardi, P. Huck, W. Koenig, M. Lorenz, Jehad Mousa, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, I. Koenig, M. Heilmann, Roman Gernhäuser, A. Kugler, T. Perez Cavalcanti, M. Jurkovic, T. Hennino, J. A. Garzón, D. Kirschner, S. P. Chernenko, R. Trebacz, P. Cabanelas, K. Kanaki, Piotr Salabura, L. Naumann, L. Maier, Volker Metag, G. Agakishiev, A. B. Kurepin, Tetyana Galatyuk, J. Friese, T. Wojcik, A. Sadovsky, K. Teilab, Y. C. Pachmayer, J. Michel, R. Bassini, J. Siebenson, E. Schwab, A. Dybczak, P. Zhou, Yu.V. Zanevsky, S. Yurevich, Burkhard Kampfer, D. Belver, M. Gumberidze, T. Heinz, Fedor Guber, Witold Przygoda, T. Christ, A. Rustamov, D. González-Díaz, J. S. Díaz, M. B. Golubeva, M. Böhmer, A. Mangiarotti, A. Balanda, M. Roy-Stephan, Tatiana Karavicheva, H. Ströbele, K. Lapidus, B. Michalska, A. Tarantola, V. Wagner, Andrey Reshetin, Laura Fabbietti, B. Spruck, M. Weber, B. Ramstein, Y. Parpottas, D. Mishra, M. Destefanis, P. Tlusty, B. W. Kolb, J. Otwinowski, S. Lang, C. Sturm, A. Gil, H. Tsertos, S. Spataro, J. Wüstenfeld, I. Fröhlich, T. Liu, J. L. Boyard, L. Lopes, Joachim Stroth, R. Krücken, E. Morinière, F. Dohrmann, Wolfgang Kuhn, P. Zumbruch, E. Castro, M. Traxler, B. Bannier, T. Eberl, E. Epple, Paolo Finocchiaro, O. Pechenova, J. Pietraszko, Yu. G. Sobolev, C. Müntz, C. Wendisch, Filip Krizek, V. Pechenov, J. S. Lange, Alexander Belyaev, O. V. Fateev, R. Holzmann, J. Markert, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), HADES, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Radius, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Momentum, Pion, Pair production, Correlation function, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

Results on pp, π+π+, and π-π- intensity interferometry are reported for collisions of Ar+KCl at 1.76$A$~GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The experimental correlation functions as a function of the relative momentum are compared to model calculations allowing the determination of the space-time extent of the corresponding emission sources. The π π source radii are found significantly larger than the pp emission radius. The present radii do well complement the source-size excitation functions of the collision system of size $A+A \simeq 40+40$. The pp source radius at fixed beam energy is found to increase linearly with the cube root of the number of participants. From this trend, a lower limit of the pp correlation radius is deduced.

Published
2011

22. Coherent pions in charge-exchange reactions

Author

Clive Ellegaard, B. Ramstein, M. Roy-Stephan, H.P. Morsch, T. Hennino, P. Radvanyi, J.C. Jourdain, J. Poitou, J. L. Boyard, D. L'Hôte, S. Rousteau, J. Gosset, M. Osterlund, D. Bachelier, Thomas Sams, C. Gaarde, M.C. Lemaire, J.S. Larsen, and P. Zupranski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Momentum transfer, Detector, Coincidence, Nuclear physics, Momentum, Pion, Total angular momentum quantum number, Angular momentum of light, High Energy Physics::Experiment, Orbital angular momentum of light, Nuclear Experiment
Abstract

Data are presented on the 12 C ( 3 He , t π + ) reaction at 2 GeV bombarding energy. In coincidence with forward scattered tritons, pions are momentum-analysed in a large acceptance detector. For events where the target is left in its g.s. or low-lying states, the angular correlation between the momentum transfer vector and the momentum of the pion is sharply peaked at small relative angles.

Published
1993

23. Λ−pfemtoscopy in collisions ofAr+KClat1.76A GeV

Author

Andrey Reshetin, V. Metag, M. Lorenz, Yvonne Chiara Pachmayer, M. Destefanis, J. A. Garzón, M. Jurkovic, R. Holzmann, J. Markert, R. Trebacz, A. Dybczak, Roman Gernhäuser, A. Kugler, P. Tlusty, Kirill Lapidus, Yiannis Parpottas, F.F. Guber, O. Pechenova, Alexey Kurepin, M. Böhmer, A. Mangiarotti, D. González-Díaz, J. S. Díaz, B. Michalska, A. M. Schmah, J. Pietraszko, B. Sailer, D. Kirschner, C. Wendisch, M. Sudol, B. Ramstein, S. Lang, J. L. Boyard, S. Yurevich, Witold Przygoda, M. Roy-Stephan, T. Hennino, C. Gilardi, O. V. Fateev, Jacek Tomasz Otwinowski, V. Pechenov, Marek Palka, M. Wisniowski, T. Galatyuk, B. W. Kolb, A. Blanco, P. Fonte, I. Koenig, A. Ivashkin, R. Kotte, B. Spruck, P. Zhou, M.B. Golubeva, L. Maier, Laura Fabbietti, S. P. Chernenko, J. S. Lange, A. Tarantola, M. Traxler, I. Iori, J. Friese, T. Wojcik, J. Michel, E. Morinière, Yu. G. Sobolev, H. Ströbele, B. Kämpfer, R. Bassini, J. Wüstenfeld, C. Müntz, P. Zumbruch, E. Castro, P. Salabura, V. Wagner, W. Koenig, Alexander Belyaev, W. Kühn, Jehad Mousa, Ana M. Gil, Filip Krizek, Tatiana Karavicheva, G. Agakishiev, Yu.V. Zanevsky, T. Eberl, L. Naumann, M. Weber, Paolo Finocchiaro, D. Belver, A. Balanda, F. Dohrmann, C. Sturm, P. Cabanelas, L. Lopes, R. Krücken, D. K. Mishra, J. Stroth, A. Sadovsky, T. Liu, S. Spataro, I. Fröhlich, T. Christ, A. Rustamov, Kalliopi Kanaki, H. Tsertos, Peter Braun-Munzinger, and K. Teilab

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Collision system, Radius, Lambda, 01 natural sciences, Nuclear physics, 0103 physical sciences, Experimental correlation, Nuclear Experiment, 010306 general physics, Beam energy, Energy (signal processing)
Abstract

Results on $\ensuremath{\Lambda}p$ femtoscopy are reported at the lowest energy so far. At a beam energy of $1.76A$ GeV, the reaction $\mathrm{Ar}+\mathrm{KCl}$ was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\ensuremath{\Lambda}$ sample was collected, allowing for the investigation of $\ensuremath{\Lambda}p$ correlations at low relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent of the $\ensuremath{\Lambda}p$ emission source. The $\ensuremath{\Lambda}p$ source radius is found to be slightly smaller than the $\mathit{pp}$ correlation radius for a similar collision system. The present $\ensuremath{\Lambda}p$ radius is significantly smaller than that found for $\mathrm{Au}+\mathrm{Au}/\mathrm{Pb}+\mathrm{Pb}$ collisions in the AGS, SPS, and RHIC energy domains but larger than that observed for electroproduction from He. Taking into account all available data, we find the $\ensuremath{\Lambda}p$ source radius to increase almost linearly with the number of participants to the power of one-third.

Published
2010

24. Search for dibaryonic states in the p-p analyzing power excitation function

Author

J. Saudinos, J. Yonnet, J. L. Boyard, R. Gacougnolle, P. Courtat, J. Arvieux, J.M. Durand, M.P. Combes-Comets, M. Garçon, M. Boivin, J.C. Duchazeaubeneix, Y. Le Bornec, N. Willis, B. Tatischeff, R. Beurtey, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Robert, Suzanne

Subjects
Excitation function, Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Amplitude, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, 010306 general physics, 01 natural sciences, Power (physics)
Abstract

The analyzing power excitation function has been measured with high accuracy between 510 and 725 MeV. The 182 measured points show no structure of an amplitude 4×10 −3 or more.

Published
1992

25. The η-meson mass

Author

F. Plouin, T. Hennino, A. Nakach, J. L. Boyard, R. S. Kessler, Colin Wilkin, W. J. Briscoe, B. Mayer, P. Fleury, R. Beurtey, G. Milleret, B. M. K. Nefkens, C. A. Whitten, D. Bachelier, M. Boivin, C. Pillai, and A. Moalem

Subjects
Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Near threshold, Meson, Error bar, Elementary particle, Particle Data Group, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract

The mass of the η meson has been measured through the study of the d p→ 3 He η reaction near threshold, the beam having been calibrated through comparison with three other nuclear reactions. The value obtained is m η =547.30±0.15 MeV/ c 2 , where the error bar includes both systematic and statistical effects. This is much more precise and significantly lower than the Particle Data Group average, through it is consistent with a previous counter experiment.

Published
1992

26. Deep SubthresholdΞ−Production inAr+KClReactions at1.76A GeV

Author

G. Agakishiev, A. Balanda, R. Bassini, D. Belver, A. V. Belyaev, A. Blanco, M. Böhmer, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, E. Castro, S. Chernenko, T. Christ, M. Destefanis, J. Díaz, F. Dohrmann, A. Dybczak, T. Eberl, L. Fabbietti, O. V. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzón, R. Gernhäuser, A. Gil, C. Gilardi, M. Golubeva, D. González-Díaz, F. Guber, T. Hennino, R. Holzmann, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, K. Kanaki, T. Karavicheva, D. Kirschner, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, F. Krizek, R. Krücken, W. Kühn, A. Kugler, A. Kurepin, S. Lang, J. S. Lange, K. Lapidus, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, D. Mishra, E. Morinière, J. Mousa, C. Müntz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, A. Schmah, Yu. G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, M. Sudol, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, V. Wagner, M. Weber, M. Wisniowski, T. Wojcik, J. Wüstenfeld, S. Yurevich, Y. V. Zanevsky, P. Zhou, and P. Zumbruch

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Hadron, Hyperon, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Xi baryon, Sigma baryon, Baryon, Nuclear physics, Particle decay, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics
Abstract

We report first results on a deep subthreshold production of the doubly strange hyperon XI{sup -} in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer at SIS18/GSI. A high-statistics and high-purity LAMBDA sample was collected, allowing for the investigation of the decay channel XI{sup -}->LAMBDApi{sup -}. The deduced XI{sup -}/(LAMBDA+SIGMA{sup 0}) production ratio of (5.6+-1.2{sub -1.7}{sup +1.8})x10{sup -3} is significantly larger than available model predictions.

Published
2009

27. ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

Author

B. Spruck, I. Iori, J. Friese, T. Wojcik, C. Sturm, J. L. Boyard, Tatiana Karavicheva, V. Pechenov, O. V. Fateev, P. Cabanelas, P. Zhou, W. Kühn, Witold Przygoda, S. Spataro, D. Belver, J. S. Lange, T. Perez Cavalcanti, R. Holzmann, J. Markert, E. Schwab, I. Fröhlich, M. Roy-Stephan, A. Sadovsky, S. Yurevich, B. Kämpfer, A.P. Ierusalimov, P. Zumbruch, E. Castro, M. Traxler, Kalliopi Kanaki, H. Tsertos, T. Galatyuk, B. Michalska, Piotr Salabura, Marek Palka, M. Wisniowski, Peter Braun-Munzinger, L. Maier, Yu.V. Zanevsky, L. Lopes, T. Christ, A. Rustamov, W. Koenig, V. Metag, Yiannis Parpottas, Laura Fabbietti, Jehad Mousa, Ana M. Gil, Alexey Kurepin, D. González-Díaz, J. S. Díaz, R. Krücken, M.B. Golubeva, Andrzej Bałanda, D. Kirschner, M. Lorenz, O. Pechenova, H. Ströbele, Filip Krizek, B. Ramstein, J. Pietraszko, V. Wagner, K. Teilab, E. Morinière, Yu. G. Sobolev, Andrey Reshetin, C. Müntz, Yvonne Chiara Pachmayer, D. K. Mishra, J. Stroth, Alexander Belyaev, T. Liu, M. Sudol, M. Destefanis, B. Bannier, P. Tlusty, Kirill Lapidus, G. Agakishiev, T. Eberl, Paolo Finocchiaro, A. M. Schmah, S. Lang, B. W. Kolb, A. Dybczak, I. Koenig, S. P. Chernenko, J. Michel, R. Bassini, J. Wüstenfeld, F. Dohrmann, L. Naumann, M. Weber, B. Sailer, T. Heinz, A. Tarantola, F.F. Guber, M. Böhmer, A. Mangiarotti, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, M. Heilmann, Roman Gernhäuser, A. Kugler, J. A. Garzón, M. Jurkovic, and R. Trebacz

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson production, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, 7. Clean energy
Abstract

We gratefully acknowledge the useful discussions with H. Oeschler and K. Redlich. In particular we thank K. Redlich for providing the calculations by the statistical model. The HADES Collaboration gratefully acknowledges support from the following: BMBF Grants 06TM970I, 06GI146I, 06F-140, and 06DR135 (Germany); GSI (TMFR1, GI/ME3, OF/STR); Excellence Cluster of Universe (Germany); Grants GA AS CR IAA100480803 and MSMT LC 07050 (Czech Republic); Grant KBN 5P03B 140 20 (Poland); INFN (Italy); CNRS/IN2P3 (France);GrantsMCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain); Grant UCY-10.3.11.12 (Cyprus); INTAS Grant 06- 1000012-8861; and EU Contract RII3-CT-2004-506078.

Published
2009

28. Excitation of the? (1232)-resonance in proton-nucleus collisions

Author

M.C. Lemaire, J.C. Jourdain, J. L. Boyard, M. Trzaska, Jacques Vandermeulen, T. Hennino, A. Rahmani, B. Ramstein, P. Zupranski, J. Augerat, Gerard Montarou, P. Radvanyi, J. P. Alard, Nicole Bastid, Pascal Dupieux, Ph. Gorodetzky, O. Valette, Joseph Cugnon, M.J. Parizet, B. Lucas, D. Bachelier, C. Cavata, M. Roy-Stephan, J. Gosset, A. LeMerdy, D. Pelte, J. Marroncle, J. Poitou, D. L'Hôte, P. Charmensat, and D. Quassoud

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pion, Proton, Scattering, Resonance, Nuclear fusion, Invariant mass, Atomic physics, Nuclear Experiment, Nuclear matter, Excitation
Abstract

The excitation of theΔ resonance is observed in proton collisions on C, Nb and Pb targets at 0.8 and 1.6 GeV incident energies. The mass E0 and widthΓ of the resonance are determined from the invariant mass spectra of correlated (p, π±)-pairs in the final state of the collision: The mass E0 is smaller than that of the free resonance, however by comparing to intra-nuclear cascade calculations, this reduction is traced back to the effects of Fermi motion, NN scattering and pion reabsorption in nuclear matter.

Published
1991

29. The (3He, t) reaction at intermediate energies

Author

P. Radvanyi, A. Guichard, Bo Jakobsson, T. Hennino, M. Roy-Stephan, C. Gaarde, J.C. Jourdain, J.S. Larsen, L.P. Ekström, J.R. Pizzi, I. Bergquist, Clive Ellegaard, C. D. Goodman, J. L. Boyard, M. Boivin, T. Hasegawa, A. Brockstedt, Didier Contardo, M. Bedjidian, D. Bachelier, J.-Y. Grossiord, and Lars Carlén

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 01 natural sciences, Spectral line, Cross section (physics), Isospin, 0103 physical sciences, Schematic model, Atomic physics, 010306 general physics, Multipole expansion, Spin-½
Abstract

Data for the (3He, t) reaction at 900 MeV and 2 GeV on the targets 26Mg, 40Ca, 48Ca, 54Fe, 90Zr and 208Pb are presented. A multipole decomposition for the data at 900 MeV has been made and the different distributions have been analysed. From the L = 0 cross section the Gamow-Teller strength distributions are extracted and compared with (p, n) data. The L = 1 and 2 distributions are analysed in a schematic model which describes the general systematics fairly well. The spectra at 2 GeV and Θ = 4° show for all targets a well-developed quasi-elastic peak. The A-dependence of the cross section is analysed in a simple model.

Published
1991

30. Two-pion production in alphap scattering at 1 GeV/nucleon in the energy region of the Roper resonance excitation

Author

M. Roy-Stephan, H.P. Morsch, P. Zupranski, L. Farhi, B. V. Razmyslovich, J. L. Boyard, V. A. Mylnikov, J.C. Jourdain, S. S. Volkov, A. V. Kravtsov, W. Augustyniak, Liudmila Malinina, A. A. Zhdanov, R.A. Kunne, E. A. Strokovsky, E. M. Orischin, G. D. Alkhazov, A. N. Prokofiev, I. I. Tkach, M. Boivin, B. Ramstein, I. B. Smirnov, T. Hennino, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Roper resonance, Proton, 010308 nuclear & particles physics, Nuclear Theory, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Production (computer science), High Energy Physics::Experiment, Alpha decay, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, Energy (signal processing)
Abstract

Semiexclusive measurements of the two-pion-production $p(\ensuremath{\alpha},{\ensuremath{\alpha}}^{'})p\ensuremath{\pi}\ensuremath{\pi}$ reaction have been carried out at an energy of ${E}_{\ensuremath{\alpha}}=4.2$ GeV at the Saturne-II (Saclay) accelerator with the SPES4-\ensuremath{\pi} installation. This reaction was investigated by simultaneous registration of the scattered \ensuremath{\alpha} particle and the secondary proton. The obtained results show that the two-pion production in inelastic \ensuremath{\alpha}-particle scattering on the proton at the energy of the experiment proceeds mainly through excitation in the target proton of the Roper resonance and its decay with emission of two pions in the isospin $I=0,S$-wave state.

Published
2008

31. Dielectron Production inC12+C12Collisions at2A GeVwith the HADES Spectrometer

Author

B. W. Kolb, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, D. Magestro, R. Coniglione, A. Ivashkin, E. Schwab, A. Sadovsky, G. Bellia, R. Kotte, A.P. Ierusalimov, F. Dohrmann, Kalliopi Kanaki, J. Friese, T. Wojcik, T. Christ, A. Rustamov, P. Cabanelas, J. A. Garzón, M. Sudol, H. Tsertos, Tatiana Karavicheva, M. Jurkovic, O. V. Fateev, Alexey Kurepin, D. González-Díaz, J. S. Díaz, C. Agodi, M. Jaskula, W. Kühn, M. Suk, Peter Braun-Munzinger, Alberica Toia, Karl Zeitelhack, C. Sturm, C. Schröder, J. L. Boyard, P. Zumbruch, Yu.V. Zanevsky, Andrey Reshetin, H. J. Körner, B. Spruck, D. Vassiliev, W. Schön, V. Pechenov, H. Ströbele, A. Vazquez, T. Eberl, Paolo Finocchiaro, V. T. Smolyankin, M. Kagarlis, Adam Malarz, B. Sailer, A. Taranenko, V. Wagner, C. Fernandez, W. Koenig, I. Iori, Wolfgang Enghardt, Jehad Mousa, Piotr Salabura, M. Ploskon, Witold Przygoda, T. Pérez, E. Lins, A. Nekhaev, H. Alvarez-Pol, S. Lange, Laura Fabbietti, C. Müntz, R.S. Simon, A. Balanda, M. Roy-Stephan, M. Sánchez, D. Zovinec, Paul Kienle, V. Pospíšil, M.B. Golubeva, L. Kidon, Luigi Cosentino, G. Agakichiev, Paolo Sapienza, R. Holzmann, J. Markert, P. Tlusty, M. Traxler, B. Kämpfer, A. M. Schmah, E. Grosse, I. Duran, S. Hlavac, Yvonne Chiara Pachmayer, B. Fuentes, H. Schön, S. Lang, J. Pietraszko, Paolo Piattelli, M. Münch, J. Lehnert, W. Prokopowicz, H. Bokemeyer, B. Ramstein, Jaroslav Bielcik, R. Krücken, Władysław Waluś, S. Spataro, I. Fröhlich, R. Pleskac, J. Stroth, I. Koenig, M. Wiśniowski, J. Homolka, L. Naumann, Jan Novotny, L. Smykov, J. Ritman, S. P. Chernenko, J. Wüstenfeld, D. Bertini, F.F. Guber, M. Böhmer, C. Garabatos, C. Maiolino, Reinhard Kulessa, Roman Gernhäuser, A. Kugler, M. Kajetanowicz, A. Kastenmüller, and V. Metag

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, General Physics and Astronomy, Electron, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Particle decay, Pair production, Orders of magnitude (time), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The invariant-mass spectrum of e{sup +}e{sup -} pairs produced in {sup 12}C+{sup 12}C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the {pi}{sup 0}-Dalitz to the {rho}/{omega} invariant-mass region. Dalitz decays of {pi}{sup 0} and {eta} account for all the yield up to 0.15 GeV/c{sup 2}, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Published
2007

32. Dielectron production in C+C and p+p collisions with HADES

Author

R. Gernhóuser, H. Ströbele, B. Kämpfer, Peter Senger, Andrey Reshetin, V. Wagner, B. Spruck, T. Hennino, C. Gilardi, P. Zumbruch, E. Castro, B. Ramstein, P. Fonte, A. Ivashkin, M. Sudol, R. Pleskac, J. Marín, R. Kotte, G. Bellia, M. Heilmann, M. Destefanis, A.P. Ierusalimov, F. Dohrmann, I. Veretenkin, J. A. Garzón, I. Iori, R.S. Simon, M. Jurkovic, R. Holzmann, P. Tlusty, K. Teilab, D. González-Díaz, J. S. Díaz, J. Mousa, T. Christ, A. Rustamov, J. Markert, R. Trȩbacz, Yu.V. Zanevsky, G. Agakishiev, Paolo Finocchiaro, Joachim Stroth, M. Roy-Stephan, W. Koenig, A. Blanco, Tatiana Karavicheva, A. M. Schmah, Ch. Hadjivasiliou, R. Krücken, Wolfgang Kuhn, L. Lopez, Y. C. Pachmayer, S. Spataro, J. Lamas-Valverde, Thomas Eberl, I. Duran, S. Lang, A. B. Kurepin, M. Traxler, Fedor Guber, R. Novotny, J. Pietraszko, M. Böhmer, A. Mangiarotti, K.A. Shileev, J. L. Boyard, Alexander Belyaev, S. Lange, M. B. Golubeva, Marek Palka, I. Frhölich, B. Sailer, I. Koenig, E. Morinière, A. Balanda, L. Naumann, B. W. Kolb, J. Otwinowski, Laura Fabbietti, Eckart Grosse, C. Müntz, A. Kugler, M. Wiśniowski, H. Wen, S. P. Chernenko, Volker Metag, M. Münch, Kalliopi Kanaki, H. Tsertos, D. Belver, D. Kirschner, O. V. Fateev, C. Agodi, J. Wüstenfeld, V. Pospíšil, Peter Braun-Munzinger, C. Sturm, A. Sadovsky, T. Galatyuk, Piotr Salabura, T. Pérez, V. Pechenov, D. Mishra, Filip Krizek, J. Friese, T. Wojcik, Witold Przygoda, B. Michalska, and P. Cabanelas

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Rho meson, Spectrometer, Hadron, Nuclear Theory, Astronomy and Astrophysics, HEAVY-ION COLLISIONS, Nuclear matter, Dilepton production, Atomic and Molecular Physics, and Optics, Energies, Nuclear physics, Pion, heavy ion collisions, dilepton production, RING RECOGNITION, RHO-MESON, ρ-meson, Heavy ion collisions, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment, Ring Recognition
Abstract

9 pages.-- HADES Collaboration: et al., The High Acceptance Di-Electron Spectrometer HADES has been constructed at the SIS accelerator (GSI Darmstadt) to investigate electron-positron pairs produced in proton, pion and heavy ion induced reactions. The main goal of these studies is to explore properties of hadrons in nuclear matter. The apparatus and the experimental results from C+C at 2.0 AGeV and 1.0 AGeV and p+p at 2.2 GeV compared with Monte-Carlo events from a generator based on known cross-sections and branching ratios are presented.

Published
2007

33. SPES4–$\pi$: installation for exclusive study of nuclear reactions

Author

J. L. Boyard, T. Hennino, L.G. Kudin, A.A. Zhdanov, A.N. Prokofiev, A. Maroni, E.M. Orischin, C. Gaarde, P. Courtat, P. Radvanyi, Liudmila Malinina, H.-P. Morsch, B. Ramstein, P. Zupranski, V. Poux, E. A. Strokovsky, B.G. Komkov, J. Larsen, M. Roy-Stephan, V.V. Golubev, M. Denoit, V.V. Baublis, M. Boivin, S.S. Volkov, J.-M. Martin, B.V. Razmyslovich, V.V. Astashin, V.Ya. Gerzenstein, A.V. Khanzadeev, C. Ellegaard, V.V. Vikhrov, I.I. Tkach, L. Farhi, R. Douet, S. Lebon, D. Bachelier, R. Skowron, A.V. Kravtsov, J.-F. Clavelin, An.A. Vorobyov, R.A. Kunne, I.B. Smirnov, V.L. Golovtsov, R. Gacougnolle, G.D. Alkhazov, V.A. Mylnikov, A.G. Atamanchuk, J.C. Jourdain, M. Österlund, W. Augustyniak, V.M. Samsonov, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spectrometer, Proton, 010308 nuclear & particles physics, Scattering, Physics::Instrumentation and Detectors, 29.40.-n, 29.30.-Aj, 07.05.Hd, Data acquisition, Particle detectors, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Baryon, Magnetic spectrometers, Pion, Dipole magnet, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Instrumentation
Abstract

EI SEP PHASE ACC; The paper describes the spectrometric system “SPES4–$\pi$” used at the National Laboratory Saturne (CE Saclay, France) for the exclusive study of the baryon resonance excitation in inelastic α and d scattering on the proton, as well as coherent pion production in charge exchange reactions. The system consists of the magnetic spectrometer SPES4 and two wide-aperture position-sensitive detector arrays, equipped with wire chambers and scintillator hodoscopes, installed around a large-gap C-shape dipole magnet.

Published
2005

34. The HADES Tracking System

Author

L. Glonti, Manfred Sobiella, B. Ramstein, Y. C. Pachmayer, Wolfgang Enghardt, P. Rosier, S. P. Chernenko, C. Sturm, E. Grosse, H.W. Daues, H. Bokemeyer, J. Wüstenfeld, M. Roy-Stephan, B. Kämpfer, Yu.V. Zanevsky, A. Sadovski, C. Garabatos, Jaroslav Bielcik, L. Naumann, F. Dohrmann, P. Zumbruch, T. Hennino, Joachim Stroth, L. Smykov, E. Badura, K. Rosenkranz, R. Kotte, W. Ott, H. Alvarez-Pol, J. Hoffmann, A.P. Ierusalimov, J. Hehner, A. Rustamov, J. Pouthas, O. V. Fateev, G. Agakichiev, J. Markert, W. Koenig, V. Pechenov, H. Stroebele, C. Müntz, J L Boyard, H. Stelzer, V. F. Chepurnov, Kalliopi Kanaki, M. Sudol, and K. Heidel

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Field (physics), Spectrometer, Meson, business.industry, Scattering, Physics::Instrumentation and Detectors, FOS: Physical sciences, chemistry.chemical_element, Tracking system, Instrumentation and Detectors (physics.ins-det), Magnetic field, Nuclear physics, chemistry, business, Nuclear Experiment, Instrumentation, Image resolution, Helium
Abstract

The tracking system of the dielectron spectrometer HADES at GSI Darmstadt is formed out of 24 low-mass, trapezoidal multi-layer drift chambers providing in total about 30 square meter of active area. Low multiple scattering in the in total four planes of drift chambers before and after the magnetic field is ensured by using helium-based gas mixtures and aluminum cathode and field wires. First in-beam performance results are contrasted with expectations from simulations. Emphasis is placed on the energy loss information, exploring its relevance regarding track recognition., 6 pages, 4 figures, presented at the 10th Vienna Conference on Instrumentation, Vienna, February 2004, to be published in NIM A (special issue)

Published
2004

35. Study of elastic ?-scattering from2H and12C atE ?=4.2 GeV

Author

M. Roy-Stephan, J. L. Boyard, J.C. Jourdain, P.-E. Tegnér, L. Murphy, F. Plouin, B. Ramstein, P. Radvanyi, S. Rousteau, P. Fuchs, T. Hennino, P. Zupranski, P. Stoler, W. Spang, M. Boivin, H. P. Morsch, V. Jaeckle, and R.A. Kunne

Subjects
Physics, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics
Published
1994

36. Analyzing powers of inelasticdpscattering in the energy region of Δ and Roper resonances excitation

Author

E. A. Strokovsky, A. V. Kravtsov, C. F. Perdrisat, I. I. Tkach, J.C. Jourdain, S. S. Volkov, Egle Tomasi-Gustafsson, A. N. Prokofiev, Clive Ellegaard, R.A. Kunne, M. Boivin, P. Morsch, M. Roy-Stephan, I.M. Sitnik, E. M. Orischin, J. L. Boyard, W. Augustyniak, L. Fahri, V. A. Punjabi, V. A. Mylnikov, B. Ramstein, M. Skousen, A. A. Zhdanov, P. Radvanyi, Liudmila Malinina, N.M. Piskunov, M. Kagarlis, J.S. Larsen, G. D. Alkhazov, P. Zupranski, B. V. Razmyslovich, Ronald Dahl, T. Hennino, C. Gaarde, and Martin Drews

Subjects
Physics, Delta, Nuclear physics, Nuclear and High Energy Physics, Quasielastic scattering, Scattering, Inelastic scattering, Deep inelastic scattering, Excitation, Energy (signal processing), Inelastic neutron scattering
Published
2001

37. A vector and tensor polarimeter for high-energy deuterons

Author

L. B. Golovanov, J. L. Boyard, R.A. Kunne, Y. Bisson, J. Yonnet, E. A. Strokovsky, J. Ball, N.E. Cheung, C. F. Perdrisat, R. Gacougnolle, V.P. Ladygin, R. Skowron, L. Bimbot, N.M. Piskunov, E. Tomasi-Gustafsson, V. A. Punjabi, P. Courtat, I.M. Sitnik, T. Hennino, A.P. Tsvinev, Yu.T. Borzunov, M. Boivin, M. K. Jones, Robert, Suzanne, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Scattering, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Monte Carlo method, Detector, Polarimeter, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Polarization (waves), Kinetic energy, 01 natural sciences, 7. Clean energy, Nuclear physics, Deuterium, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

The characteristics of a polarimeter to measure the tensor polarization of deuterons with energy of a few GeV have been studied by Monte Carlo simulations. The analyzing reaction is forward elastic dp scattering. The results of the simulation have been verified with a prototype hydrogen cell and a recoil proton detector using drift tubes inserted in the polarimeter POMME. The test used a vector and tensor polarized deuteron beam of 1.6 GeV kinetic energy at the accelerator Saturne. The feasability of a vector and tensor deuteron high-energy polarimeter based on deuteron–proton elastic scattering reaction has been studied. We present here the prediction of a Monte Carlo simulation and the first results of a test made with a prototype, at the Saturne National Laboratory.

Published
1999

38. Calibration of the polarimeter POMME with polarized deuterons at 1.8 GeV

Author

R.A. Kunne, J. L. Boyard, E. A. Strokovsky, V.P. Ladygin, B. Ramstein, M. Morlet, V. A. Punjabi, J.C. Jourdain, L. H. Rosier, L. Bimbot, V Jaeckle, P. Morsch, T. Hennino, Charles Glashausser, R. Wurzinger, M. Boivin, L. Farhi, Chaden Djalali, M. K. Jones, N.M. Piskunov, J. Van de Wiele, E. Tomasi-Gustafsson, F. Plouin, M. Roy-Stephan, C. F. Perdrisat, I.M. Sitnik, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, High energy, 010308 nuclear & particles physics, Scattering, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Polarimeter, 7. Clean energy, 01 natural sciences, Nuclear physics, Deuterium, 0103 physical sciences, Calibration, Detectors and Experimental Techniques, Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

We report here the results of the calibration of the polarimeter POMME for vector polarized deuterons at an energy of 1.8 GeV. The results show that inclusive deuteron-carbon scattering has substantial vector analyzing power even at this high energy. The results obtained on two analyzers, carbon, which is generally used and a lighter material, paraffin, are found to be similar.

Published
1995

39. Dissipative aspects in 200 MeV/u Kr-induced reactions

Author

M.F. Rivet, C. Volant, C.O. Bacri, J. L. Boyard, D. Bachelier, D. Bazin, T. Hennino, P. Roussel, B. Lott, C. Donzaud, B. Borderie, R. Bimbot, F. Clapier, L. Tassan-Got, C. Stephan, D. Disdier, C. Grunberg, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Robert, Suzanne

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Projectile, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Momentum, Nuclear physics, Excited state, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation, Nuclear Physics
Abstract

Energy dissipation is studied in 200 MeV/u 84Kr-induced reactions. Two experiments were performed at the SATURNE facility with the SPES4 spectrometer. Projectile-like fragments were measured for both the 84Kr+197Au and 84Kr+59Co systems. In the latter case light charged particles emitted in the forward direction were detected in coincidence with PLF. From the projectile-like fragment isotopic distributions one can estimate that the mean excitation energy value per abraded nucleon deposited in primary fragments is quite large (20–30 MeV). However, the excitation energy distribution is very broad: the neutron-rich nuclei come from weakly excited neutron-rich primary fragments. The mean velocity loss of projectile-like fragments with respect to the projectile velocity as well as the correlation between the proton coincidence rate and the projectile-like fragments momentum also claim for a dissipative mechanism.

Published
1995

40. Measurement of tensor polarization of deuterons from3He→d+pbreakup at internal momenta up to 0.4 GeV/c

Author

R.A. Kunne, E. A. Strokovsky, J. Yonnet, M Garçon, T. Hennino, R. Skowron, Yu.T. Borzunov, Y. Bisson, E. Tomasi-Gustafsson, N.M. Piskunov, I.M. Sitnik, J.-L. Sans, C. F. Perdrisat, J. L. Boyard, S. Nedev, L. B. Golovanov, J. Ball, P. Courtat, L. V. Malinina, M. Boivin, R. Gacougnolle, M. K. Jones, L. Bimbot, and V. A. Punjabi

Subjects
Physics, Nuclear reaction, History, Particle physics, Spectrometer, Solar energetic particles, Hadron, Polarization (waves), Computer Science Applications, Education, Nuclear physics, Baryon, Tensor, Nucleon
Abstract

The tensor polarization (?20) of deuterons emitted in the p(3He,d)X reaction at 0? in the lab. system was measured at the Saturne National Laboratory in Saclay, using the SPES-4 spectrometer with the HYPOM polarimeter in the area of its focal plane. The momentum of the detected deuterons was kept fixed at 3.77 GeV/c, while the momentum of the 3He beam was varied from 4.60 to 5.66 GeV/c, thus providing a range of internal momenta k of the deuteron inside the 3He from 0 up to 0.4 GeV/c. The obtained data are compared with the theoretical predictions.

Published
2011

41. Measurement of the deuteron tensor polarization at the 3He → d + p vertex up to internal momenta of 0.43 GeV/c

Author

L. B. Golovanov, L. Bimbot, T. Hennino, Y. Bisson, R.A. Kunne, R. Skowron, J.-L. Sans, Di. Kirillov, Egle Tomasi-Gustafsson, N.M. Piskunov, L. V. Malinina, M. K. Jones, M. Boivin, V. A. Punjabi, S. Nedev, Yu.T. Borzunov, I.M. Sitnik, E. A. Strokovsky, L.S. Azhgirey, P. Courtat, C. F. Perdrisat, M. Garçon, M.P. Rekalo, J. P. Ball, R. Gacougnolle, J. Yonnet, and J. L. Boyard

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Particle physics, Deuterium, Stress–energy tensor, Tensor, Beam emittance, Polarization (waves), Charged particle
Published
2000

42. Peripheral collisions with 200 mev/nucleon krypton ions

Author

T. Hennino, B. Borderie, D. Bachelier, C. Stephan, M.F. Rivet, J. L. Boyard, R. Rimbot, D. Disdier, C. Grunberg, F. Clapier, Ch.O. Bacri, C. Donzaud, B. Lott, D. Bazin, L. Tassan-Got, P. Roussel, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, Krypton, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Peripheral, Nuclear physics, Fragmentation (mass spectrometry), chemistry, Cascade, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract

Using a magnetic spectrometer, a precision measurement of N/Z distributions and fragment velocity distributions was performed at 0.6° and 1.5° in peripheral collisions of 200 MeV / nucleon 84Kr on a gold target. The data are compared with both the participant-spectator model and the intranuclear cascade model. It is shown that the primary fragments underwent substantial excitation, which cannot be accomodated with the cold fragmentation.

Published
1991

43. Charged-pion production in noninclusive proton-nucleus interactions at 0.8 and 1.6 GeV incident energies

Author

J. Marroncle, D. Bachelier, J. Poitou, D. Qassoud, T. Hennino, J. P. Alard, B. Ramstein, Gerard Montarou, A. Rahmani, Ph. Gorodetzky, P. Radvanyi, M.J. Parizet, B. Lucas, M. Trzaska, M. C. Lemaire, Jacques Vandermeulen, P. Charmensat, D. L'Hôte, Joseph Cugnon, J. Augerat, O. Valette, P. Zupranski, J. L. Boyard, J.C. Jourdain, A. Le Merdy, J. Gosset, Pascal Dupieux, Nicole Bastid, C. Cavata, M. Roy-Stephan, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Charged particle, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium
Abstract

Charged pions and light nuclei ({ital p}, {ital d}, {ital t}, {sup 3}He, and {sup 4}He) have been measured in the interaction of proton beams with C, Nb, and Pb targets at 0.8 and 1.6 GeV incident energies, using a large solid angle detector. From slices on the multiplicity of protonlike particles (free protons and protons bound in light fragments), the events have been sorted out into two classes corresponding to more peripheral and more central collisions. For each class of events, the mean value and the dispersion of the {pi}{sup +} and {pi}{sup {minus}} multiplicity distributions have been studied as a function of target mass and incident energy. Comparisons to the Liege intranuclear cascade predictions exhibit some discrepancies which are discussed.

Published
1991

45. Study of elastic ?-scattering from2H and12C at E?=4.2 GeV

Author

B. Ramstein, P. Radvanyi, S. Rousteau, P. Stoler, P. Fuchs, J. L. Boyard, T. Hennino, L. Murphy, P.-E. Tegnér, J.C. Jourdain, W. Spang, P. Zupranski, V. Jaeckle, R.A. Kunne, M. Boivin, M. Roy-Stephan, H.P. Morsch, and F. Plouin

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Deuterium, Scattering, Nuclear fusion, Astrophysics::Earth and Planetary Astrophysics, Molecular physics, Electron scattering
Abstract

Elastic scattering ofα-particles from deuterium and12C has been investigated usingα-particles from Saturne. The differential cross sections have been analysed within an optical model description using a folding potential. Matter radii extracted at this energy are consistent with radii deduced from electron scattering.

Published
1995

46. (He3,t) Reaction at Intermediate Energies

Author

J. L. Boyard, J.C. Jourdain, M. Chamcham, T. Hennino, M. Gusakow, C. Gaarde, M. Boivin, Clive Ellegaard, Bo Jakobsson, Peter Ekström, M. Roy-Stephan, J. Lyttkens, M. Bedjidian, J.-Y. Grossiord, C. D. Goodman, I. Bergqvist, Lars Carlén, D. Bachelier, J.R. Pizzi, P. Radvanyi, A. Guichard, R. Haroutunian, and J.S. Larsen

Subjects
Nuclear reaction, Nuclear physics, Physics, Angular momentum, Isospin, General Physics and Astronomy, Atomic physics, Impulse (physics), Born approximation, Nuclear Experiment, Spectral line, Excitation, Charged particle
Abstract

Data are presented for the (/sup 3/He, t) reaction at energies of 600 MeV, 1.2 GeV, and 2 GeV on targets /sup nat/C, /sup 54/Fe, and /sup 89/Y. The low--excitation-energy regions of the spectra are dominated by isospin-spin excitations. Cross-section calculations in distorted-wave impulse approximation with parameters from NN data account reasonably well for the data. At 2-GeV bombarding energy a strong excitation of the ..delta.. resonance is observed for all targets.

Published
1983

47. Excitation of the Δ resonance in relativistic heavy ion charge exchange reactions

Author

M. Roy-Stephan, J.-Y. Grossiord, J.C. Jourdain, T. Hennino, Didier Contardo, C. Gaarde, J.-R. Pizzi, D. Bachelier, A. Guichard, J.S. Larsen, J. Tinsley, P. Radvanyi, Clive Ellegaard, and J. L. Boyard

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Projectile, Nuclear structure, Resonance, Heavy ion, Atomic physics, Nucleon, Excitation, Charge exchange
Abstract

Excitation of the Δ resonance has been observed for the first time in a heavy ion reaction. The strength of the Δ signal depends on the projectile nuclear structure. In the same incident energy range, about 900 MeV per nucleon, we observe — a strong Δ excitation in 27 Al( 20 Ne, 20 F) and 27 Al( 20 Ne, 20 Na), — a weak Δ in 12 C( 14 N, 14 C) and — nearly no Δ excitation in ( 12 C, 12 B) and ( 12 C, 12 N) whatever the target is among a sample of nuclei from 12 C to 89 Y.

Published
1986

48. Excitation of(p32)−1and(p12)−1hole states in theO16(π+,p)O15reaction at 66 MeV

Author

D. Bachelier, T. Hennino, J. L. Boyard, P. Radvanyi, J.C. Jourdain, and M. Roy-Stephan

Subjects
Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Excited state, Hadron, Analytical chemistry, Atomic physics, Born approximation, Nucleon, Ground state, Spectral line
Abstract

Angular distributions have been measured at 66 MeV for the /sup 16/O(..pi../sup +/,p)/sup 15/O reaction leading to the (p/sub 3///sub 2/)/sup -1/ hole state at 6.18 MeV and the (p/sub 1///sub 2/)/sup -1/ hole ground state of /sup 15/O. The ratio of the two differential cross sections lies between 6 and 13 over the whole measured angular range. A comparison is made with preliminary calculations of Miller. At 45/sup 0/ and 105/sup 0/ a measurement has also been performed on the reaction /sup 16/O(..pi../sup -/,p)/sup 15/C at the same incident energy.

Published
1977

49. Reaction (dpol,2He) at intermediate energies

Author

J. L. Boyard, Clive Ellegaard, Didier Contardo, I. Bergqvist, T. Hennino, J. Tinsley, P. Radvanyi, A. Guichard, Peter Ekström, A. Brockstedt, M. Bedjidian, J.S. Larsen, J.-Y. Grossiord, C. Gaarde, C. D. Goodman, T. S. Jorgensen, D. Bachelier, M. Roy-Stephan, and J. C. Jourdain

Subjects
Physics, Nuclear reaction, Proton, Isospin, General Physics and Astronomy, Singlet state, Atomic physics, Nuclear Experiment, Spin (physics), Isotopes of helium, Energy (signal processing), Spectral line
Abstract

We have succeeded in measuring at 0\ifmmode^\circ\else\textdegree\fi{} and small angles the energy spectra for the (d,2p${[\mathrm{}}^{1}$${S}_{0}$]) reaction (with the two protons in the singlet S state) at 650 MeV and 2 GeV. It is demonstrated that the reaction is a one-step process that can be used to study isospin-spin excitations. The \ensuremath{\Delta} excitation is very clearly observed. A shift down in energy of the \ensuremath{\Delta} peak from the proton to the $^{12}\mathrm{C}$ target is observed. The experiments are performed with a tensor polarized beam and the tensor analyzing power for the p(${d}_{\mathrm{pol}}$,${\mathrm{}}^{2}$He)n reaction at 2 GeV is given.

Published
1987

50. Coherent π+ photoproduction on 3He in the region of the Δ1236 resonance

Author

P. Radvanyi, J. L. Boyard, J.C. Jourdain, M. Bernas, and D. Bachelier

Subjects
Nuclear reaction, Physics, Elastic scattering, Nuclear and High Energy Physics, Fixed angle, Hadron, Form factor (quantum field theory), Resonance, Charge (physics), Electron, Atomic physics
Abstract

An experimental study of the 3 He( γ , π + ) 3 H reaction has been performed in the region of the Δ 1236 resonance between 227 MeV and 453 MeV. The experiment shows two main features: at fixed four-momentum transfer q 2 , the resonance is shifted towards lower energies, this shift increasing with q 2 ; at a fixed angle, but variable q 2 , the minimum of the charge form factor observed in the elastic scattering of electrons on 3 He does not appear. Recent calculations explain partly these two effects. This experiment might be used as part of a test of time-reversal invariance in the electromagnetic interaction of hadrons.

Published
1975

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