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44 results on '"COZMA, M. D."'

1. Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era

Author

Russotto, P., Cozma, M. D., De Filippo, E., Fèvre, A. Le, Leifels, Y., and Łukasik, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The study of the equation-of-state (EoS) describing the properties of nuclear matter away from the normal conditions is a relevant and intriguing topic of modern nuclear physics. The last decades have witnessed a substantial experimental progress in derivation of the symmetric matter term of the EoS and of the so-called symmetry energy for the asymmetric matter, especially at densities below the saturation point. But it is only in recent years that the opening of the multi-messenger astronomy era, triggered by detection of gravitational waves due to the neutron star mergers, has renewed and enlarged the interest in high-density EoS, being the main ingredient for determining the structure and properties of neutron stars. In this paper we review our knowledge obtained from heavy-ion collisions up to the 1 GeV/nucleon regime, on the EoS above nuclear saturation density. Special emphasis is given on the still few results on symmetry energy at high densities and their interconnections with multi-messenger astronomy findings., Comment: 79 pages, 25 figures

Published
2023
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2. Symmetry energy at high densities from neutron/proton flow excitation functions

Author

Russotto, P., Fèvre, A. Le, Łukasik, J., Boretzky, K., Cozma, M. D., De Filippo, E., Gašparić, I., Leifels, Y., Lihtar, I., Pirrone, S., Politi, G., and Trautmann, W.

Subjects
Nuclear Experiment
Abstract

Determination of the high density behavior of the symmetry energy through the simultaneous measurement of elliptic flow excitation functions of neutrons, protons and light clusters is proposed. The elliptic flow developed in relativistic heavy ion collisions has been proven theoretically and experimentally to have a unique sensitivity and robustness in probing the symmetry energy up to around $2 \rho_{o}$. The knowledge of the density dependence of the symmetry energy in a broad range of densities will provide a missing link for astrophysical predictions of the neutron star mass--radius relation. In particular, the data colud provide tighter constraints on the slope parameter L and entirely new limits on $K_{sym}$, the currently poorly constrained symmetry energy curvature parameter.

Published
2021

3. Probing the Symmetry Energy with the Spectral Pion Ratio

Author

Estee, J., Lynch, W. G., Tsang, C. Y., Barney, J., Jhang, G., Tsang, M. B., Wang, R., Kaneko, M., Lee, J. W., Isobe, T., Kurata-Nishimura, M., Murakami, T., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y. J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H. S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A. B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Toernqvist, H., Togano, Y., Xiao, Z. G., Yennello, S. J., Zhang, Y., and Cozma, M. D.

Subjects
Nuclear Experiment
Abstract

Many neutron star (NS) properties, such as the proton fraction within a NS, reflect the symmetry energy contributions to the Equation of State that dominate when neutron and proton densities differ strongly. To constrain these contributions at supra-saturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be $42 < L < 117$ MeV. This value is slightly lower but consistent with the $L$ values deduced from a recent measurement of the neutron skin thickness of $^{208}$Pb.

Published
2021
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4. In-medium $\Delta(1232)$ potential, pion production in heavy-ion collisions and the symmetry energy

Author

Cozma, M. D. and Tsang, M. B.

Subjects
Nuclear Theory
Abstract

Using the dcQMD transport model, the isoscalar and isovector in-medium potentials of the $\Delta$(1232) baryon are studied and information regarding their effective strength is obtained from a comparison to experimental pion production data in heavy-ion collisions below 800 MeV/nucleon impact energy. The best description is achieved for an isoscalar potential moderately more attractive than the nucleon optical potential and a rather small isoscalar relative effective mass m$^*_\Delta \approx$ 0.45. For the isovector component only a constraint between the potential's strength at saturation and the isovector effective mass difference can be extracted, which depends on quantities such as the slope of the symmetry energy and the neutron-proton effective mass difference. These results are incompatible with the usual assumption, in transport models, that the $\Delta$(1232) and nucleon potentials are equal. The density dependence of symmetry energy can be studied using the high transverse momentum tail of pion multiplicity ratio spectra. Results are however correlated with the value of neutron-proton effective mass difference. This region of spectra is shown to be affected by uncertain model ingredients such as the pion potential or in-medium correction to inelastic scattering cross-sections at levels smaller than 10$\%$. Extraction of precise constraints for the density dependence of symmetry energy above saturation will require experimental data for pion production in heavy-ion collisions below 800 MeV/nucleon impact energy and experimental values for the high transverse momentum tail of pion multiplicity ratio spectra accurate to better than 5$\%$., Comment: 22 pages, 13 figures

Published
2021
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5. Feasability of constraining the curvature parameter of the symmetry energy using elliptic flow data

Author

Cozma, M. D.

Subjects
Nuclear Theory
Abstract

A QMD type transport model supplemented by a phase-space coalescence model fitted to FOPI experimental multiplicities of free nucleons and light clusters has been used to study the density dependence of the symmetry energy above the saturation point by a comparison with experimental elliptic flow ratios measured by the FOPI-LAND and ASYEOS collaborations in $^{197}$Au+$^{197}$Au collisions at 400 MeV/nucleon impact energy. A previous calculation has proven that neutron-to-proton and neutron-to-charged particles elliptic flow ratios probe on average different densities allowing in principle the extraction of both the slope $L$ and curvature $K_{sym}$ parameters of the symmetry energy. Consequently a Gogny interaction inspired potential has been modified to allow independent changes of $L$ and $K_{sym}$. Comparing theoretical predictions with experimental data for neutron-to-proton and neutron-to-charged particles elliptic flow ratios the following constraints have been extracted: $L$=85$\pm$22(exp)$\pm$20(th)$\pm$12(sys) MeV and $K_{sym}$=96$\pm$315(exp)$\pm$170(th)$\pm$166(sys) MeV. Residual model dependence is accounted for in the magnitude of the quoted theoretical error. Systematical uncertainties are generated by the inability of the transport model to reproduce experimental light-cluster-to-proton multiplicity ratios. A value for $L$, free of systematical theoretical uncertainties, can be extracted from the neutron-to-proton elliptic flow ratio alone: $L$=84$\pm$30(exp)$\pm$19(th) MeV. It has also been demonstrated that elliptic flow ratios reach a maximum sensitivity on the $K_{sym}$ parameter in heavy-ion collisions of about 250 MeV/nucleon impact energy, allowing a reduction of the experimental component of uncertainty to about 150 MeV for this parameter., Comment: 22 pages, 13 figures

Published
2017
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6. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

Russotto, P., Gannon, S., Kupny, S., Lasko, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Fèvre, A. Le, Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Lukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawlowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Nuclear Experiment
Abstract

Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, was used for complementary measurements of the isotopic composition and flows of light charged particles. From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value \gamma = 0.72 \pm 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation., Comment: 25 pages, 22 figures, accepted for publication in Physical Review C

Published
2016
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7. Constraining the density dependence of the symmetry energy using the multiplicity and average $p_T$ ratios of charged pions

Author

Cozma, M. D.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The charged pion multiplicity ratio in intermediate energy heavy-ion collisions, a probe of the density dependence of symmetry energy above the saturation point, has been proven in a previous study to be extremely sensitive to the strength of the isovector $\Delta$(1232) potential in nuclear matter. As there is no knowledge, either from theory or experiment, about the magnitude of this quantity, the extraction of constraints on the slope of the symmetry energy at saturation by using exclusively the mentioned observable is hindered at present. It is shown that, by including the ratio of average $p_T$ of charged pions $\langle p_T^{(\pi^+)}\rangle/\langle p_T^{(\pi^-)}\rangle$ in the list of fitted observables, the noted problem can be circumvented. A realistic description of this observable requires accounting for the interaction of pions with the dense nuclear matter environment by the incorporation of the so called $S$-wave and $P$-wave pion optical potentials. This is performed within the framework of a quantum molecular dynamics transport model that enforces the conservation of the total energy of the system. It is shown that constraints on the slope of the symmetry energy at saturation density and the strength of the $\Delta$(1232) potential can be simultaneously extracted. A symmetry energy with a value of the slope parameter $L>$ 50 MeV is favored, at 1$\sigma$ confidence level, from a comparison with published FOPI experimental data. A precise constraint will require experimental data more accurate than presently available, particularly for the charged pion multiplicity ratio, and better knowledge of the density and momentum dependence of the pion potential for the whole range of these two variables probed in intermediate energy heavy-ion collisions., Comment: 22 pages, 17 figures

Published
2016
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8. The impact of energy conservation in transport models on the $\pi^-/\pi^+$ multiplicity ratio in heavy-ion collisions and the symmetry energy

Author

Cozma, M. D.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The charged pion multiplicity ratio in intermediate energy central heavy-ion collisions has been proposed as a suitable observable to constrain the high density dependence of the isovector part of the equation of state, with contradicting results. Using an upgraded version of the T\"ubingen QMD transport model, which allows the conservation of energy at a local or global level by accounting for the potential energy of hadrons in two-body collisions and leading thus to particle production threshold shifts, we demonstrate that compatible constraints for the symmetry energy stiffness can be extracted from pion multiplicity and elliptic flow observables. Nevertheless, pion multiplicities are proven to be highly sensitive to the yet unknown isovector part of the in-medium $\Delta$(1232) potential which hinders presently the extraction of meaningful information on the high density dependence of the symmetry energy. A solution to this problem together with the inclusion of contributions presently neglected, such as in-medium pion potentials and retardation effects, are needed for a final verdict on this topic., Comment: 12 pages, 7 figures

Published
2014
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9. Flow probe of symmetry energy in relativistic heavy-ion reactions

Author

Russotto, P., Cozma, M. D., Fevre, A. Le, Leifels, Y., Lemmon, R., Li, Q., Lukasik, J., and Trautmann, W.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Flow observables in heavy-ion reactions at incident energies up to about 1 GeV per nucleon have been shown to be very useful for investigating the reaction dynamics and for determining the parameters of reaction models based on transport theory. In particular, the elliptic flow in collisions of neutron-rich heavy-ion systems emerges as an observable sensitive to the strength of the symmetry energy at supra-saturation densities. The comparison of ratios or differences of neutron and proton flows or neutron and hydrogen flows with predictions of transport models favors an approximately linear density dependence, consistent with ab-initio nuclear-matter theories. Extensive parameter searches have shown that the model dependence is comparable to the uncertainties of existing experimental data. Comprehensive new flow data of high accuracy, partly also through providing stronger constraints on model parameters, can thus be expected to improve our knowledge of the equation of state of asymmetric nuclear matter., Comment: 20 pages, 24 figures, review to appear in EPJA special volume on nuclear symmetry energy

Published
2013
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10. Towards a model-independent constraint of the high-density dependence of the symmetry energy

Author

Cozma, M. D., Leifels, Y., Trautmann, W., Li, Q., and Russotto, P.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Neutron-proton elliptic flow difference and ratio have been shown to be promising observables in the attempt to constrain the density dependence of the symmetry energy above the saturation point from heavy-ion collision data. Their dependence on model parameters like microscopic nucleon-nucleon cross-sections, compressibility of nuclear matter, optical potential, and symmetry energy parametrization is thoroughly studied. By using a parametrization of the symmetry energy derived from the momentum dependent Gogny force in conjunction with the T\"{u}bingen QMD model and comparing with the experimental FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon, a moderately stiff, x=-1.35 +/- 1.25, symmetry energy is extracted, a result that agrees with that of a similar study that employed the UrQMD transport model and a momentum independent power-law parametrization of the symmetry energy. This contrasts with diverging results extracted from the FOPI $\pi^{-}/\pi^{+}$ ratio available in the literature., Comment: 18 pages, 3 figures, accepted for publication in Phys. Rev. C

Published
2013
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11. Neutron-proton elliptic flow difference as a probe for the high density dependence of the symmetry energy

Author

Cozma, M. D.

Subjects
Nuclear Theory
Abstract

We employ an isospin dependent version of the QMD transport model to study the influence of the isospin dependent part of the nuclear matter equation of state and in-medium nucleon-nucleon cross-sections on the dynamics of heavy-ion collisions at intermediate energies. We find that the extraction of useful information on the isospin-dependent part of the equation of state of nuclear matter from proton or neutron elliptic flows is obstructed by their sensitivity to model parameters and in-medium values of nucleon-nucleon cross-sections. Opposite to that, neutron-proton elliptic flow difference shows little dependence on those variables while its dependence on the isospin asymmetric EoS is enhanced. Comparison with experimental neutron-hydrogen FOPI-LAND data excludes the extreme super-soft scenarios for the high density dependence of asy-EoS. Existing neutron-proton elliptic flow difference experimental data are poised with uncertainties and cannot constrain the asy-EoS any further., Comment: 13 pages, 7 figures, published Physics Letters B, final version

Published
2011
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12. Dilepton production at intermediate energies with in-medium spectral functions of vector mesons

Author

Santini, E., Cozma, M. D., Faessler, Amand, Fuchs, C., Krivoruchenko, M. I., and Martemyanov, B.

Subjects
Nuclear Theory
Abstract

We report on a self-consistent calculation of the in-medium spectral functions of the rho and omega mesons at finite baryon density. The corresponding in-medium dilepton spectrum is generated and compared with HADES data. We find that an iterative calculation of the vector meson spectral functions provides a reasonable description of the experimental data., Comment: Talk given at International School of Nuclear Physics, 30th Course, "Heavy Ion Collisions from the Coulomb Barrier to the Quark Gluon Plasma", Erice, Italy, 16-24 Sep 2008

Published
2008
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13. Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons

Author

Santini, E., Cozma, M. D., Faessler, Amand, Fuchs, C., Krivoruchenko, M. I., and Martemyanov, B.

Subjects
Nuclear Theory
Abstract

The in-medium spectral functions of $\rho$ and $\omega$ mesons and the broadening of the nucleon resonances at finite baryon density are calculated self-consistently by combining a resonance dominance model for the vector meson production with an extended vector meson dominance model. The influence of the in-medium modifications of the vector meson properties on the dilepton spectrum in heavy-ion collisions is investigated. The dilepton spectrum is generated for the C+C reaction at 2.0$A$ GeV and compared with recent HADES Collaboration data. The collision dynamics is then described by the T\"ubingen relativistic quantum molecular dynamics transport model. We find that an iterative calculation of the vector meson spectral functions that takes into account the broadening of the nucleon resonances due to their increased in-medium decay branchings is convergent and provides a reasonable description of the experimental data in the mass region $0.45\leq M \leq 0.75$ GeV. On the other side, the theoretical calculations slightly underestimate the region $m_\pi\leq M \leq 0.4$ GeV. Popular in-medium scenarios such as a schematic collisional broadening and dropping vector mesons masses are discussed as well., Comment: v2: some references, comments and one Fig. added; accepted for publication in Phys. Rev. C

Published
2008
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14. Dilepton production at HADES: theoretical predictions

Author

Cozma, M. D., Fuchs, C., Santini, E., and Fässler, A.

Subjects
Nuclear Theory
Abstract

Dileptons represent a unique probe for nuclear matter under extreme conditions reached in heavy-ion collisions. They allow to study meson properties, like mass and decay width, at various density and temperature regimes. Present days models allow generally a good description of dilepton spectra in ultra-relativistic heavy ion collision. For the energy regime of a few GeV/nucleon, important discrepancies between theory and experiment, known as the DLS puzzle, have been observed. Various models, including the one developed by the T\"{u}bingen group, have tried to address this problem, but have proven only partially successful. High precision spectra of dilepton emission in heavy-ion reactions at 1 and 2 GeV/nucleon will be released in the near future by the HADES Collaboration at GSI. Here we present the predictions for dilepton spectra in C+C reactions at 1 and 2 GeV/nucleon and investigate up to what degree possible scenarios for the in-medium modification of vector mesons properties are accessible by the HADES experiment., Comment: 12 pages, 4 figures; submitted to Phys.Lett. B

Published
2006
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15. Covariant model for proton-proton bremsstrahlung: Comparison with high-precision data

Author

Cozma, M. D., Martinus, G. H., Scholten, O., Timmermans, R. G. E., and Tjon, J. A.

Subjects
Nuclear Theory
Abstract

We compare a relativistic covariant model for proton-proton bremsstrahlung with high-quality data from KVI. The agreement in large parts of phase space is satisfactory. However, remarkably large discrepancies are observed for specific kinematic regions. These failures are shown to occur primarily when the final two-nucleon system has energies less than about 15 MeV., Comment: 9 pages, 4 figures; Accepted for publication in Physical Review C

Published
2001
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20. In-medium Δ(1232) potential, pion production in heavy-ion collisions and the symmetry energy.

Author

Cozma, M. D. and Tsang, M. B.

Subjects
PION production, HEAVY-ion atom collisions, SYMMETRY, INELASTIC scattering, PARTICLES (Nuclear physics), PIONS
Abstract

Using the dcQMD transport model, the isoscalar and isovector in-medium potentials of the Δ (1232) baryon are studied and information regarding their effective strength is obtained from a comparison to experimental pion production data in heavy-ion collisions below 800 MeV/nucleon impact energy. The best description is achieved for an isoscalar potential moderately more attractive than the nucleon optical potential and a rather small isoscalar relative effective mass m Δ ∗ ≈ 0.45. For the isovector component only a constraint between the potential's strength at saturation and the isovector effective mass difference can be extracted, which depends on quantities such as the slope of the symmetry energy and the neutron-proton effective mass difference. These results are incompatible with the usual assumption, in transport models, that the Δ (1232) and nucleon potentials are equal. The density dependence of symmetry energy can be studied using the high transverse momentum tail of pion multiplicity ratio spectra. Results are however correlated with the value of neutron-proton effective mass difference. This region of spectra is shown to be affected by uncertain model ingredients such as the pion potential or in-medium correction to inelastic scattering cross-sections at levels smaller than 10%. Extraction of precise constraints for the density dependence of symmetry energy above saturation will require experimental data for pion production in heavy-ion collisions below 800 MeV/nucleon impact energy and experimental values for the high transverse momentum tail of pion multiplicity ratio spectra accurate to better than 5%. [ABSTRACT FROM AUTHOR]

Published
2021
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21. Probing the Symmetry Term of the Nuclear Equation of State at High Baryonic Densities

Author

Russotto, P, primary, Acosta, L, additional, Adamczyk, M, additional, Al-Ajlan, A, additional, Al-Garawi, M, additional, Al-Homaidhi, S, additional, Amorini, F, additional, Auditore, L, additional, Aumann, T, additional, Ayyad, Y, additional, Basrak, Z, additional, Benlliure, J, additional, Boisjoli, M, additional, Boretzky, K, additional, Brzychczyk, J, additional, Budzanowski, A, additional, Caesar, C, additional, Cardella, G, additional, Cammarata, P, additional, Chajecki, Z, additional, Chartier, M, additional, Chbihi, A, additional, Colonna, M, additional, Cozma, M D, additional, Czech, B, additional, De Filippo, E, additional, Di Toro, M, additional, Famiano, M, additional, Gannon, S, additional, Gašparić, I, additional, Grassi, L, additional, Guazzoni, C, additional, Guazzoni, P, additional, Heil, M, additional, Heilborn, L, additional, Introzzi, R, additional, Isobe, T, additional, Kezzar, K, additional, Kiš, M, additional, Krasznahorkay, A, additional, Kupny, S, additional, Kurz, N, additional, La Guidara, E, additional, Lanzalone, G, additional, Lasko, P, additional, Le Fèvre, A, additional, Leifels, Y, additional, Lemmon, R C, additional, Li, QF, additional, Lombardo, I, additional, Łukasik, J, additional, Lynch, W G, additional, Marini, P, additional, Matthews, Z, additional, May, L, additional, Minniti, T, additional, Mostazo, M, additional, Pagano, A, additional, Pagano, E V, additional, Papa, M, additional, Pawłowski, P, additional, Pirrone, S, additional, Politi, G, additional, Porto, F, additional, Reviol, W, additional, Riccio, F, additional, Rizzo, F, additional, Rosato, E, additional, Rossi, D, additional, Santoro, S, additional, Sarantites, D G, additional, Simon, H, additional, Skwirczynska, I, additional, Sosin, Z, additional, Stuhl, L, additional, Trautmann, W, additional, Trifirò, A, additional, Trimarchi, M, additional, Tsang, M B, additional, Verde, G, additional, Veselsky, M, additional, Vigilante, M, additional, Wang, Yongjia, additional, Wieloch, A, additional, Wigg, P, additional, Winkelbauer, J, additional, Wolter, H H, additional, Wu, P, additional, Yennello, S, additional, Zambon, P, additional, Zetta, L, additional, and Zoric, M, additional

Published
2017
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23. Constraining The Symmetry Energy (Far) Above Saturation Density Using Elliptic Flow.

Author

Cozma, M. D.

Subjects
*SYMMETRY (Physics), *HEAVY ion collisions, *GOLD isotopes, *PARTICLES (Nuclear physics), *CLUSTER theory (Nuclear physics), *EQUATIONS of state
Abstract

A QMD transport model that employs a modified momentum dependent interaction (MDI2) potential, supplemented by a phase-space coalescence model fitted to experimental multiplicities of free nucleons and light clusters, is used to study the density dependence of the symmetry energy above the saturation point by a comparison with experimental elliptic flow ratios measured by the FOPI-LAND and ASYEOS collaborations for 197Au+197Au collisions at 400 MeV/nucleon impact energy. Comparing theoretical predictions with experimental data for neutron-to-proton and neutron-to-charged particles elliptic flow ratios the following constraint is extracted for the slope L and curvature Ksym of symmetry energy at saturation: L=59±24(exp)±16(th)±10(sys) MeV and Ksym=0±370(exp)±220(th)±150(sys) MeV. Theoretical errors are the result of poorer known model ingredients. Systematical uncertainties are generated by the inability of the transport model to reproduce experimental light-cluster-to-proton multiplicity ratios. A more accurate value for L, free of systematical theoretical uncertainties, can be extracted from the neutron-to-proton elliptic flow ratio alone: L=63±18(exp)±14(th) MeV. [ABSTRACT FROM AUTHOR]

Published
2017
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24. The impact of energy conservation in transport models on the $��^-/��^+$ multiplicity ratio in heavy-ion collisions and the symmetry energy

Author

Cozma, M. D.

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The charged pion multiplicity ratio in intermediate energy central heavy-ion collisions has been proposed as a suitable observable to constrain the high density dependence of the isovector part of the equation of state, with contradicting results. Using an upgraded version of the T��bingen QMD transport model, which allows the conservation of energy at a local or global level by accounting for the potential energy of hadrons in two-body collisions and leading thus to particle production threshold shifts, we demonstrate that compatible constraints for the symmetry energy stiffness can be extracted from pion multiplicity and elliptic flow observables. Nevertheless, pion multiplicities are proven to be highly sensitive to the yet unknown isovector part of the in-medium $��$(1232) potential which hinders presently the extraction of meaningful information on the high density dependence of the symmetry energy. A solution to this problem together with the inclusion of contributions presently neglected, such as in-medium pion potentials and retardation effects, are needed for a final verdict on this topic., 12 pages, 7 figures

Published
2014
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25. Studio dell’energia di simmetria ad alta densità: l’esperimento ASY-EOS al GSI

Author

Russotto P., Chartier M., Cozma M. D., De Filippo E., le Fevre A., Gannon S., Gasparic I., Kis M., Kupny S., Leifels Y., Lemmon R. C., Li Q., Lukasik J., Marini P., Pawlowski P., Trautmann W., Veselski M., Acosta L., Adamczyk M. Al Ajlan A., Al Garawi M. Al Homaidhi S., Amorini F., Auditore L., Aumann T., Ayyad Y., baran V., Basrak Z., Bassini R., Benlliure J., Boiano C., Boisjoli M., Boretzky K., Brzychczyk J., Budzanowski A., Cardella G., Cammarata P., Chajecki Z., Chbihi A., Colonna M., Czech B., Di Toro M., Famiano M., Greco V., Grassi L., Guazzoni C., Guazzoni P., Heil M., heilborn L., Introzzi R., Isobe T., Kezzar K., Krasznahorkay A., Kurz N., la Guidara E., Lanzalone G., Lasko P., Lombardo I., Lynch W. G., matthews Z., May L., Minniti T., Mostazo M., Pagano A., papa M., Pirrone S., Pleskac R., Politi G., Porto F., Reifarth R., Reisdorf W., Riccio F., Rizzo F., Rosato E., Rossi D., Simon H., Skwirczynska I., Sosin Z., Stuhl L., Trifirò A., Trimarchi M., Tsang M. B., Verde G., Vigilante M., Wieloch A., Wigg P., Wolter H. H., Wu P., Yennello S., Zambon P., Zetta L., Zoric M., SANTORO, Simone, Russotto P., Chartier M., Cozma M.D., De Filippo E., le Fevre A., Gannon S., Gasparic I., Kis M., Kupny S., Leifels Y., Lemmon R.C., Li Q., Lukasik J., Marini P., Pawlowski P., Santoro S., Trautmann W., Veselski M., Acosta L., Adamczyk M. Al-Ajlan A., Al-Garawi M. Al-Homaidhi S., Amorini F., Auditore L., Aumann T., Ayyad Y., baran V., Basrak Z., Bassini R., Benlliure J., Boiano C., Boisjoli M., Boretzky K., Brzychczyk J., Budzanowski A., Cardella G., Cammarata P., Chajecki Z., Chbihi A., Colonna M., Czech B., Di Toro M., Famiano M., Greco V., Grassi L., Guazzoni C., Guazzoni P., Heil M., heilborn L., Introzzi R., Isobe T., Kezzar K., Krasznahorkay A., Kurz N., la Guidara E., Lanzalone G., Lasko P., Lombardo I., Lynch W.G., matthews Z., May L., Minniti T., Mostazo M., Pagano A., papa M., Pirrone S., Pleskac R., Politi G., Porto F., Reifarth R., Reisdorf W., Riccio F., Rizzo F., Rosato E., Rossi D., Simon H., Skwirczynska I., Sosin Z., Stuhl L., Trifirò A., Trimarchi M., Tsang M.B., Verde G., Vigilante M., Wieloch A., Wigg P., Wolter H.H., Wu P., Yennello S., Zambon P., Zetta L., and Zoric M.

Published
2014

26. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

Russotto, P., primary, Gannon, S., additional, Kupny, S., additional, Lasko, P., additional, Acosta, L., additional, Adamczyk, M., additional, Al-Ajlan, A., additional, Al-Garawi, M., additional, Al-Homaidhi, S., additional, Amorini, F., additional, Auditore, L., additional, Aumann, T., additional, Ayyad, Y., additional, Basrak, Z., additional, Benlliure, J., additional, Boisjoli, M., additional, Boretzky, K., additional, Brzychczyk, J., additional, Budzanowski, A., additional, Caesar, C., additional, Cardella, G., additional, Cammarata, P., additional, Chajecki, Z., additional, Chartier, M., additional, Chbihi, A., additional, Colonna, M., additional, Cozma, M. D., additional, Czech, B., additional, De Filippo, E., additional, Di Toro, M., additional, Famiano, M., additional, Gašparić, I., additional, Grassi, L., additional, Guazzoni, C., additional, Guazzoni, P., additional, Heil, M., additional, Heilborn, L., additional, Introzzi, R., additional, Isobe, T., additional, Kezzar, K., additional, Kiš, M., additional, Krasznahorkay, A., additional, Kurz, N., additional, La Guidara, E., additional, Lanzalone, G., additional, Le Fèvre, A., additional, Leifels, Y., additional, Lemmon, R. C., additional, Li, Q. F., additional, Lombardo, I., additional, Łukasik, J., additional, Lynch, W. G., additional, Marini, P., additional, Matthews, Z., additional, May, L., additional, Minniti, T., additional, Mostazo, M., additional, Pagano, A., additional, Pagano, E. V., additional, Papa, M., additional, Pawłowski, P., additional, Pirrone, S., additional, Politi, G., additional, Porto, F., additional, Reviol, W., additional, Riccio, F., additional, Rizzo, F., additional, Rosato, E., additional, Rossi, D., additional, Santoro, S., additional, Sarantites, D. G., additional, Simon, H., additional, Skwirczynska, I., additional, Sosin, Z., additional, Stuhl, L., additional, Trautmann, W., additional, Trifirò, A., additional, Trimarchi, M., additional, Tsang, M. B., additional, Verde, G., additional, Veselsky, M., additional, Vigilante, M., additional, Wang, Yongjia, additional, Wieloch, A., additional, Wigg, P., additional, Winkelbauer, J., additional, Wolter, H. H., additional, Wu, P., additional, Yennello, S., additional, Zambon, P., additional, Zetta, L., additional, and Zoric, M., additional

Published
2016
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27. The ASY-EOS experiment at GSI: Investigating the symmetry energy at supra-saturation densities

Author

Lunardi, S., Russotto, P., Chartier, M., Cozma, M. D., De Filippo, E., Le Fèvre, A., Gannon, S., Gašparić, I., Kiš, M., Kupny, S., Leifels, Y., Lemmon, R. C., Li, Q., Łukasik, J., Marini, P., Pawłowski, P., Santoro, S., Trautmann, W., Veselsky, M., Acosta, L., Adamczyk, M., Al Ajlan, A., Al Garawi, M., Al Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Czech, B., Di Toro, M., Famiano, M., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, Riccardo, Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Lombardo, I., Lynch, W. G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, S., Pleskac, R., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., Bizzeti, P. G., Bucci, C., Chiari, M., Dainese, A., Di Nezza, P., Menegazzo, R., Nannini, A., Signorini, C., Valiente Dobon, J. J., 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), Russotto, P., Chartier, M., Filippo, E., Fèvre, A., Gannon, S., Gaparić, I., Ki, M., Kupny, S., Leifels, Y., Lemmon, R., Ukasik, J., Marini, P., Pagano, A., Pawowski, P., Santoro, S, Trautmann, W., Veselsky, M., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Cozma, D., Czech, B., Toro, M., Famiano, M., Geraci, E., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., Guidara, E., Lanzalone, G., Lasko, P., Li, Q., Lombardo, I., Lynch, W., Matthews, Z., May, L., Minniti, T., Mostazo, M., Papa, M., Pirrone, S., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifirò, A., Trimarchi, M., Tsang, M., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., B.A.Li and J.B.Natowitz, P., Russotto, M., Chartier, E., De Filippo, A., Le Fevre, S., Gannon, A., Ga??spari??, M., Ki??, S., Kupny, Y., Leifel, R., Lemmon, J., Lukasik, P., Marini, A., Pagano, P., Pawlowski, S., Santoro, W., Trautmann, M., Veselsky, L., Acosta, M., Adamczyk, A., Al Ajlan, M., Al Garawi, S., Al Homaidhi, F., Amorini, L., Auditore, T., Aumann, Y., Ayyad, V., Baran, Z., Basrak, J., Benlliure, C., Boiano, C., Boisjoli, K., Boretzky, J., Brzychczyk, A., Budzanowski, G., Cardella, P., Cammarata, Z., Chajecki, A., Chbihi, M., Colonna, B., Czech, M., Di Toro, M., Famiano, E., Geraci, L., Grassi, V., Greco, C., Guazzoni, P., Guazzoni, M., Heil, L., Heilborn, R., Introzzi, T., Isobe, K., Kezzar, A., Krasznahorskay, N., Kurz, E., La Guidara, G., Lanzalone, P., Lasko, Q., Li, I., Lombardo, W. G., Lynch, Z., Matthew, L., May, T., Minniti, M., Mostazo, M., Papa, S., Pirrone, G., Politi, F., Porto, R., Reifarth, W., Reisdorf, F., Riccio, F., Rizzo, Rosato, Elio, D., Rossi, H., Simon, I., Skwirczynska, Z., Sosin, A., Trifirò, M., Trimarchi, M. B., Tsang, G., Verde, Vigilante, Mariano, A., Wieloch, P., Wigg, H. H., Wolter, P., Wu, S., Yennello, P., Zambon, L., Zetta, M., Zoric, Cozma, M., De Filippo, E., Le Fèvre, A., Gašparić, I., Kiš, M., Łukasik, J., Pawłowski, P., Santoro, S., Bassini, R., Di Toro, M., La Guidara, E., and Pleskac, R.

Subjects
Particle physics, History, QC1-999, Nuclear Theory, FOS: Physical sciences, and isobaric spin 24.10.Pa Thermal and statistical models, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Education, Nuclear physics, Physics and Astronomy (all), nuclear physics, heavy-ions, symmetry energy, Au+Au collisions, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, ComputingMilieux_MISCELLANEOUS, Physics, sezele, Order (ring theory), Nuclear equation of state, Observable, 21.65.-f Nuclear matter 27.80.+w 190(less-than-or-equal-to)A(less-than-or-equal-to)219 24.60.-k Statistical theory and fluctuations 25.75.Gz Particle correlations and fluctuations 21.10.Hw Spin, Symmetry (physics), Term (time), Computer Science Applications, parity, Nuclear reactions, Saturation (chemistry), Nucleon, Energy (signal processing)
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich heavy-ions systems at intermediate energies has been proposed as an observable sensitive to the strength of the symmetry term in the nuclear Equation Of State (EOS) at supra-saturation densities. The recent results obtained from the existing FOPI/LAND data for $^{197}$Au+$^{197}$Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but suffer from a considerable statistical uncertainty. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration in May 2011., Comment: Talk given by P. Russotto at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

Published
2013

28. Impact of the in-medium conservation of energy on the π-/π+ multiplicity ratio.

Author

COZMA, M. D.

Subjects
*ISOBARIC spin, *ENERGY conservation, *BARYONS, *PARTICLES (Nuclear physics), *NUCLEAR isobars
Abstract

An upgraded version of the isospin dependent Tübingen QMD transport model, which allows the conservation of the total energy, is presented. This is achieved by including in the energy-balance equations of the density, isospin asymmetry and momentum dependent inmedium baryon potential energies. It leads to an effective modification of particle production thresholds with respect to the vacuum ones. Compatible constraints for the symmetry energy stiffness from π-/π+ multiplicity ratio and elliptic flow experimental data of Au+Au collisions at 400 MeV/nucleon can be extracted in this case. However, an important dependence of the π-/π+ observable on the strength of the isovector part of the Δ(1232) isobar potential is also demonstrated. [ABSTRACT FROM AUTHOR]

Published
2016
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29. The ASY-EOS Experiment at GSI.

Author

RUSSOTTO, P., CHARTIER, M., COZMA, M. D., DE FILIPPO, E., LE FÈVRE, A., GANNON, S., GASPARIC, I., KIŠ, M., KUPNY, S., LEIFELS, Y., LEMMON, R. C., LI, Q., ŁUKASIK, J., MARINI, P., PAWŁOWSKI, P., TRAUTMANN, W., ACOSTA, L., ADAMCZYK, M., AL-AJLAN, A., and AL-GARAWI, M.

Subjects
NEUTRONS, PROTONS, HEAVY ions, PARTICLES (Nuclear physics), DENSITY
Abstract

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for 197Au+197Au collisions at 400 MeV/nucleon. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data. [ABSTRACT FROM AUTHOR]

Published
2016
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30. Sensitivity of pp bremsstrahlung on low-energy NN interaction

Author

Cozma, M. D., Olaf Scholten, Timmermans, R. G. E., and Tjon, J. A.

Subjects
SEPARABLE REPRESENTATIONS, PARTIAL-WAVE ANALYSIS, POTENTIAL MODEL CALCULATION, ONE-BOSON-EXCHANGE, NUCLEON-NUCLEON-SCATTERING, Nuclear Experiment, ELECTRON-DEUTERON SCATTERING, PION-PRODUCTION THRESHOLD, PROTON-PROTON BREMSSTRAHLUNG, BETHE-SALPETER-EQUATION, RELATIVISTIC DESCRIPTION
Abstract

In this paper we investigate possible reasons for the differences found in some kinematic regions between existing microscopic pp bremsstrahlung models and experimental data. It is shown that this is partly the result of an inaccurate description of the elastic nucleon-nucleon (NN) T matrix at low energies. We show that for the phase space probed by the recent KVI experiment, Coulomb corrections do not influence the observables. The difference between theory and experiment is reduced after the NN one-boson exchange model is refitted to the pp phase shifts, however, a sizable discrepancy persists.

Published
2003

31. The ASY-EOS experiment at GSI: Constraining the symmetry energy at supra-saturation densities.

Author

RUSSOTTO, P., CHARTIER, M., COZMA, M. D., DE FILIPPO, E., LE FÈVRE, A., GANNON, S., GAŠPARIĆ, I., KIŠ, M., KUPNY, S., LEIFELS, Y., LEMMON, R. C., LI, Q., ŁUKASIK, J., MARINI, P., PAWŁOWSKI, P., TRAUTMANN, W., ACOSTA, L., ADAMCZYK, M., AL-AJLAN, A., and AL-GARAWI, M.

Subjects
SATURATION (Chemistry), SYMMETRY (Physics), NEUTRONS, RELATIVISTIC energy, NUCLEAR chemistry
Abstract

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for 197Au+197Au, 96Zr+96Zr and 96Ru+96Ru collisions at 400 MeV/nucleon with the Large Area Neutron Detector LAND as part of a setup with several additional detection systems used for the event characterization. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data. [ABSTRACT FROM AUTHOR]

Published
2015
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36. High-precision proton-proton bremsstrahlung measurements at190MeV

Author

Mahjour-Shafiei, M., primary, Bacelar, J. C. S., additional, Cozma, M. D., additional, van Goethem, M. J., additional, Harakeh, M. N., additional, Hoefman, M., additional, Huisman, H., additional, Kalantar-Nayestanaki, N., additional, Löhner, H., additional, Messchendorp, J. G., additional, Ostendorf, R. W., additional, Schadmand, S., additional, Scholten, O., additional, Volkerts, M., additional, and Wilschut, H. W., additional

Published
2004
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39. Relativistic covariant model for proton-proton bremsstrahlung.

Author

Cozma, M. D., Scholten, O., Timmermans, R. G. E., and Tjon, J. A.

Subjects
*PROTON-proton interactions, *BREMSSTRAHLUNG, *ANALYSIS of covariance
Abstract

We compare a relativistic covariant model for proton-proton bremsstrahlung with new high-quality data from KVI. The agreement in large parts of phase space is satisfactory. However, remarkably large discrepancies are observed for specific kinematic regions. These failures are shown to occur primarily when the final two-nucleon system has energies less than about 15 MeV. [ABSTRACT FROM AUTHOR]

Published
2001

40. Probing the Symmetry Term of the Nuclear Equation of State at High Baryonic Densities

Author

M. Trimarchi, A. Chbihi, Piotr Pawłowski, G. Lanzalone, Riccardo Introzzi, Roy Crawford Lemmon, S. Kupny, Yongjia Wang, Z. Matthews, F. Amorini, Marielle Chartier, M. Zoric, J. Brzychczyk, Chiara Guazzoni, F. Rizzo, N. Kurz, H. H. Wolter, Matthias Heil, M. Al-Garawi, D. M. Rossi, Zbigniew Sosin, P. Z. Wu, Maria Colonna, A. Budzanowski, Qingfeng Li, Yassid Ayyad, W. G. Lynch, Abdulrahman Alajlan, F. Porto, M. Mostazo, Sherry Yennello, Herbert A. Simon, P. Wigg, Giuseppe Verde, P. Cammarata, Lauren Heilborn, D. G. Sarantites, S. Al-Homaidhi, E. V. Pagano, S. Santoro, Mariano Vigilante, W. Reviol, A. Pagano, P. Guazzoni, S. Pirrone, L. Stuhl, T. Isobe, E. La Guidara, P. Lasko, K. Kezzar, J. Łukasik, L. Zetta, P. Russotto, L. Grassi, Michael Famiano, J. Benlliure, A. Wieloch, M. Boisjoli, I. Skwirczyńska, W. Trautmann, S. Gannon, Igor Gašparić, Jack Winkelbauer, Elio Rosato, A. Le Fèvre, Thomas Aumann, M. Kiš, P. Zambon, Z. Chajecki, Michele Papa, M. Adamczyk, Ivano Lombardo, M. B. Tsang, M. D. Cozma, A. Trifirò, Martin Veselsky, F. Riccio, Luis Acosta, Yvonne Leifels, E. De Filippo, K. Boretzky, L. W. May, Lucrezia Auditore, C. Caesar, G. Politi, M. Di Toro, B. Czech, Attila Krasznahorkay, G. Cardella, Paola Marini, Triestino Minniti, Zoran Basrak, 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), 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), Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gannon, S., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, Linear density, History, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Computer Science Applications, Education, Term (time), Nuclear physics, Baryon, Physics and Astronomy (all), symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, Quantum electrodynamics, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

International audience; In the ASY-EOS experiment flows of neutrons and light charged particles were measured for (197)Au+(197)Au collisions at 400 MeV/nucleon, in order to investigate the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. By comparing the experimental data with the UrQMD transport model predictions, we have extracted a new constraint in agreement with the moderately soft to linear density dependence obtained in the former analysis on FOPI-LAND data, but reducing the associated uncertainty by a factor ∼ 2.

Published
2017

41. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

S. Al-Homaidhi, Abdulrahman Alajlan, A. Wieloch, F. Amorini, Angelo Pagano, Marielle Chartier, E. Rosato, Roy Crawford Lemmon, D. G. Sarantites, S. Kupny, Z. Chajecki, Martin Veselsky, Tadaaki Isobe, M. B. Tsang, F. Riccio, Z. Basrak, Triestino Minniti, A. Chbihi, G. Cardella, P. Zambon, Piotr Pawłowski, J. Benlliure, Giuseppe Verde, Michele Papa, M. Adamczyk, L. Stuhl, Marina Trimarchi, M.D. Cozma, J. Brzychczyk, A. Trifirò, E. De Filippo, C. Caesar, Z. Matthews, Maria Colonna, Lauren Heilborn, F. Rizzo, S. Santoro, N. Kurz, S. Pirrone, S. Gannon, H. H. Wolter, M. Kiš, Luis Acosta, P. Cammarata, Igor Gašparić, Jack Winkelbauer, P. Lasko, Michael Heil, E. La Guidara, Y. Leifels, A. Le Fèvre, A. Krasznahorkay, K. Boretzky, M. Di Toro, B. Czech, I. Lombardo, Thomas Aumann, P. Wigg, E. V. Pagano, M. Boisjoli, K. Kezzar, Paola Marini, W. Reviol, P. Guazzoni, Michael Famiano, I. Skwirczyńska, L. Zetta, P. Russotto, Sherry Yennello, F. Porto, M. Mostazo, W. G. Lynch, H. Simon, M. Zoric, Riccardo Introzzi, M. Al-Garawi, P. Z. Wu, Yassid Ayyad, J. Łukasik, L. Grassi, Chiara Guazzoni, A. Budzanowski, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, Mariano Vigilante, W. Trautmann, G. Lanzalone, Yongjia Wang, L. W. May, Lucrezia Auditore, G. Politi, 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), 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), 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), 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), Russotto, P., Gannon, S., Kupny, S., Lasko, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, Nuclear and High Energy Physics, sezele, 010308 nuclear & particles physics, Elliptic flow, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Nuclear physics, symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, 0103 physical sciences, HEAVY-ION COLLISIONS, EQUATION-OF-STATE, MASS-RADIUS RELATION, COLLECTIVE FLOW, PION-PRODUCTION, NEUTRON, DEPENDENCE, FRAGMENTATION, SYSTEMATICS, EMISSION, Large Area Neutron Detector, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Nucleon, Event (particle physics), Parametrization
Abstract

Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, was used for complementary measurements of the isotopic composition and flows of light charged particles. From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value \gamma = 0.72 \pm 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation., Comment: 25 pages, 22 figures, accepted for publication in Physical Review C

Published
2016

42. The symmetry energy at suprasaturation density and the ASY-EOS experiment at GSI

Author

S. Santoro, P. Lasko, Luis Acosta, D. G. Sarantites, S. Al-Homaidhi, K. Boretzky, Giuseppe Verde, F. Porto, S. Pirrone, Z. Chajecki, E. V. Pagano, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, A. Wieloch, Sherry Yennello, F. Rizzo, L. Stuhl, M. B. Tsang, L. Zetta, Roy Crawford Lemmon, S. Kupny, Maria Colonna, M. Kiš, Martin Veselsky, P. Zambon, C. Caesar, F. Riccio, P. Cammarata, Yvonne Leifels, I. Skwirczyńska, J. Benlliure, Marina Trimarchi, Chiara Guazzoni, Mariano Vigilante, A. Trifirò, P. Russotto, Z. Basrak, A. Chbihi, L. W. May, W. Trautmann, M. Di Toro, Piotr Pawłowski, B. Czech, E. La Guidara, M.D. Cozma, W. Reviol, A. Pagano, P. Guazzoni, H. H. Wolter, Michael Famiano, J. Brzychczyk, E. De Filippo, M. Al-Garawi, G. Cardella, G. Lanzalone, Z. Matthews, Igor Gašparić, Jack Winkelbauer, W. G. Lynch, A. Budzanowski, N. Kurz, L. Grassi, M. Mostazo, A. Le Fèvre, Elio Rosato, Paola Marini, M. Zoric, Thomas Aumann, A. Krasznahorkay, Herbert A. Simon, Riccardo Introzzi, Yongjia Wang, P. Wigg, K. Kezzar, Abdulrahman Alajlan, J. Łukasik, P. Z. Wu, Yassid Ayyad, Triestino Minniti, Ivano Lombardo, Lucrezia Auditore, G. Politi, M. Boisjoli, F. Amorini, Marielle Chartier, Lauren Heilborn, Tadaaki Isobe, Matthias Heil, Michele Papa, M. Adamczyk, S. Gannon, 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 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), 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), 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), De Filippo, E., Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., Di Toro, M., Famiano, M., Gannon, S., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
energy: symmetry, QC1-999, Hadron, Nuclear Theory, Elementary particle, Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Physics and Astronomy (all), 0103 physical sciences, Neutron, ddc:530, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Elliptic flow, gold, charged particle, Charged particle, Symmetry (physics), Darmstadt Lab, n: elliptic flow, nucleus: equation of state, density dependence, density, Baryon, Nucleon, light nucleus, saturation: density, experimental results
Abstract

International audience; The ASY-EOS experiment at GSI laboratory measured the direct and elliptic flow of neutrons and light charged particles in the reaction 197Au+197 Au at 400 A MeV incident energy. The ratio of elliptic flow of neutrons with respect to that of the light charged particles was used as main experimental observable to probe the density dependence of the symmetry energy term of the nuclear equation of state. Results, obtained by comparison of the experimental data with the UrQMD model predictions, strongly support a moderately soft to linear density dependence of the symmetry energy at suprasaturation densities below 2ρ0.

Published
2016

43. The ASY-EOS Experiment at GSI

Author

Z. Basrak, A. Chbihi, Piotr Pawłowski, H. H. Wolter, Giuseppe Verde, Z. Matthews, S. Pirrone, Z. Chajecki, Maria Colonna, M. B. Tsang, J. Łukasik, F. Amorini, F. Rizzo, Abdulrahman Alajlan, Triestino Minniti, P. Cammarata, Marielle Chartier, Chiara Guazzoni, A. Budzanowski, Zbigniew Sosin, Qingfeng Li, L. Grassi, B. Czech, Martin Veselsky, F. Riccio, W. G. Lynch, N. Kurz, Vincenzo Greco, Yvonne Leifels, M. Boisjoli, Attila Krasznahorkay, Sherry Yennello, L. Stuhl, Herbert A. Simon, Mariano Vigilante, W. Trautmann, P. Russotto, S. Al-Homaidhi, W. Reisdorf, F. Porto, A. Wieloch, P. Wigg, E. La Guidara, K. Kezzar, I. Skwirczyńska, L. Zetta, Paola Marini, M. Kiš, M. Zoric, Igor Gašparić, G. Lanzalone, R. Pleskac, Elio Rosato, Angelo Pagano, M. D. Cozma, Lauren Heilborn, L. Acosta, E. De Filippo, Riccardo Introzzi, Roy Crawford Lemmon, S. Gannon, D. Rossi, M. Di Toro, C. Boiano, S. Kupny, G. Cardella, Michele Papa, M. Adamczyk, J. Benlliure, Rene Reifarth, P. Z. Wu, A. Trifirò, Yassid Ayyad, Matthias Heil, Ivano Lombardo, M. Al-Garawi, Tadaaki Isobe, P. Guazzoni, Michael Famiano, M. Trimarchi, R. Bassini, A. Le Fèvre, Thomas Aumann, J. Brzychczyk, Lucrezia Auditore, G. Politi, L. W. May, K. Boretzky, M. Mostazo, S. Santoro, P. Lasko, V. Baran, P. Zambon, 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), 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), 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), Greco, V., Russotto, P., Chartier, M., Cozma, M. D., De Filippo, E., Le Fèvre, A., Gannon, S., Gašparić, I., Kiš, M., Kupny, S., Leifels, Y., Lemmon, R. C., Li, Q., Aukasik, J., Marini, P., Pawłowski, P., Trautmann, W., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Czech, B., Di Toro, M., Famiano, M., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Lombardo, I., Lynch, W. G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, S., Pleskac, R., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., Greco, Vincenzo, La Cognata, M., Pirrone, Sara, Rizzo, Francesca, Spitaleri, Claudio, and 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)

Subjects
DENSITY-DEPENDENCE, COLLISIONS, heavy ion: scattering, energy: symmetry, QC1-999, Hadron, Nuclear Theory, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Nuclear physics, Physics and Astronomy (all), quantum molecular dynamics: relativistic, symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, 0103 physical sciences, Neutron, 010306 general physics, PROBE, Nuclear Experiment, numerical calculations, DETECTOR, Physics, density, DENSITY-DEPENDENCE, SYMMETRY ENERGY, COLLISIONS, FRAGMENTATION, DETECTOR, NEUTRON, PROBE, sezele, 010308 nuclear & particles physics, Elliptic flow, SYMMETRY ENERGY, charged particle, Charged particle, Baryon, n: flow, NEUTRON, Atomic physics, FRAGMENTATION, Nucleon, nucleus: equation of state
Abstract

International audience; The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for ^197Au+^197Au collisions at 400 MeV/nucleon. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data.

Published
2016

44. The ASY-EOS experiment at GSI: Constraining the symmetry energy at supra-saturation densities

Author

P. Russotto, M. Chartier, M.D. Cozma, E. De Filippo, A. Le Fèvre, S. Gannon, I. Gašparić, M. Kiš, S. Kupny, Y. Leifels, R.C. Lemmon, Q. Li, J. Łukasik, P. Marini, P. Pawłowski, W. Trautmann, L. Acosta, M. Adamczyk, A. Al-Ajlan, M. Al-Garawi, S. Al-Homaidhi, F. Amorini, L. Auditore, T. Aumann, Y. Ayyad, V. Baran, Z. Basrak, R. Bassini, J. Benlliure, C. Boiano, M. Boisjoli, K. Boretzky, J. Brzychczyk, A. Budzanowski, G. Cardella, P. Cammarata, Z. Chajecki, A. Chbihi, M. Colonna, B. Czech, M. Di Toro, M. Famiano, V. Greco, L. Grassi, C. Guazzoni, P. Guazzoni, M. Heil, L. Heilborn, R. Introzzi, T. Isobe, K. Kezzar, A. Krasznahorkay, N. Kurz, E. La Guidara, G. Lanzalone, P. Lasko, I. Lombardo, W.G. Lynch, Z. Matthews, L. May, T. Minniti, M. Mostazo, A. Pagano, M. Papa, S. Pirrone, R. Pleskac, G. Politi, F. Porto, R. Reifarth, W. Reisdorf, F. Riccio, F. Rizzo, E. Rosato, D. Rossi, S. Santoro, H. Simon, I. Skwirczynska, Z. Sosin, L. Stuhl, A. Trifirò, M. Trimarchi, M.B. Tsang, G. Verde, M. Veselsky, M. Vigilante, A. Wieloch, P. Wigg, H.H. Wolter, P. Wu, S. Yennello, P. Zambon, L. Zetta, M. Zoric, Borderie, B., Russotto, P., Chartier, M., Cozma, M. D., De Filippo, E., Le Fever, A., Gannon, S., Gǎsparíc, I., Kǐs, M., Kupny, S., Leifels, Y., Lemmon, R. C., Li, Q., Lukasik, J., Marini, P., Pawlowski, P., Trautmann, W., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Czech, B., Di Toro, M., Famiano, M., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Lombardo, I., Lynch, W. G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, S., Pleskac, R., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifiro, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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 and Astronomy (all), sezele, Physics, QC1-999, Nuclear Theory, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The elliptic-flow ratio of neutrons with respect to protons or lightcomplex particles in reactions of heavy ions at pre-relativistic energieshas been proposed as an observable sensitive to the strength of thesymmetry term of the nuclear equation of state at supra-saturationdensities. In the ASY-EOS experiment at the GSI laboratory, flows ofneutrons and light charged particles were measured for 197Au+197Au,96Zr+96Zr and 96Ru+96Ru collisions at 400 MeV/nucleon with theLarge Area Neutron Detector LAND as part of a setup with severaladditional detection systems used for the event characterization. Flowresults obtained for the Au+Au system, in comparison with predictionsof the UrQMD transport model, confirm the moderately soft to lineardensity dependence of the symmetry energy deduced from the earlierFOPI-LAND data.

Published
2015

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