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25 results on '"Greco, V."'

1. Shear viscosity of QGP and the anisotropic flows within an event by event transport approach

Author

Plumari S., Guardo G. L., Puglisi A., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

We have employed a relativistic kinetic transport approach that incorporates initial state fluctuations to study the effect of a temperature dependent shear viscosity to entropy density ratio η/s(T) on the build-up of the anisotropic flows υn(pT). We find that at LHC energies and for ultra-central collisions (0 – 0.2%) the υn(pT) have a stronger sensitivity to the T dependence of η/s in the QGP phase and this sensitivity increases with the order of the harmonic n. Moreover we have studied the correlation between the initial spatial anisotropies ϵn and the final flow coefficients 〈υn〉 for different centralities and for the two beam energies. The study shows that at LHC energies there is more correlation than at RHIC energies. In particular at LHC energies and for ultra-central collisions the linear correlation coefficient C(ϵn, υn) ≈ 1 for n = 2, 3, 4 and 5 suggesting that the 〈υn〉 are strongly related to the initial value of ϵn.

Published
2016
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2. Hadronization via coalescence at RHIC and LHC

Author

Minissale V., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

An hadronization model that includes coalescence and fragmentation is used in this work to obtain predictions at both RHIC and LHC energy for light and strange hadrons transverse momentum spectra (π, p, k, Λ) and baryon to meson ratios (p/π, Λ/k) in a wide range of pT. This is accomplished without changing coalescence parameters. The ratios p/π and Λ/K shows the right behaviour except for some lack of baryon yield in a limited pT range around 6 GeV. This would indicate that the AKK fragmentation functions is too flat at pT < 8 GeV.

Published
2016
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3. Shear viscosity to electric conductivity ratio of the QGP

Author

Puglisi A., Plumari S., and Greco V.

Subjects
Physics, QC1-999
Abstract

The transport coefficients of strongly interacting matter are currently subject of intense theoretical and phenomenological studies due to their relevance for the characterization of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions (uRHIC). We predict that (η/s)/(σel/T), independently on the running coupling αs(T), should increase up to about ~ 20 for T → Tc, while it goes down to a nearly flat behavior around ≃ 4 for T ≥ 4 Tc. Therefore we find a stronger T-dependence of σel/T with respect to η/s that in a quasiparticle approach is constrained by lQCD thermodynamics. A conformal theory, instead, predicts a similar T dependence of η/s and σel/T.

Published
2016
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4. The ASY-EOS Experiment at GSI

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., 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., 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., and Zoric M.

Subjects
Physics, QC1-999
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.

Published
2016
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5. Modelling early stages of relativistic heavy-ion collisions

Author

Ruggieri M., Puglisi A., Oliva L., Plumari S., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

In this study we model early time dynamics of relativistic heavy ion collisions by an initial color-electric field which then decays to a plasma by the Schwinger mechanism. The dynamics of the many particles system produced by the decay is described by relativistic kinetic theory, taking into account the backreaction on the color field by solving self-consistently the kinetic and the field equations. Our main results concern isotropization and thermalization for a 1+1D expanding geometry. In case of small η/s (η/s ≲ 0.3) we find τisotropization ≈ 0.8 fm/c and τthermalization ≈ 1 fm/c in agreement with the common lore of hydrodynamics.

Published
2016
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6. The nuclear matrix elements of 0νββ decay and the NUMEN project at INFN-LNS

Author

Cappuzzello F., Agodi C., Balestra F., Bijker R., Bonanno D., Bongiovanni D., Branchina V., Calabrese S., Calabretta L., Calanna A., Calvo D., Carbone D., Cavallaro M., Colonna M., Ferrero S., Foti A., Finocchiaro P., Giraudo G., Greco V., Iazzi F., Introzzi R., Lanzalone G., Lavagno A., Lo Presti D., Longhitano F., Muoio A., Pandola L., Rifuggiato D., Ruslan M.V., Santopinto E., Scaltrito L., Tudisco S., and Zagatto V.

Subjects
Physics, QC1-999
Abstract

An innovative technique to access the nuclear matrix elements entering the expression of the life time of the double beta decay by relevant cross sections measurements of double charge exchange reactions is proposed. A key aspect of the project is the use of the MAGNEX large acceptance magnetic spectrometer, for the detection of the ejectiles, and of the LNS K800 Superconducting Cyclotron (CS), for the acceleration of the required high resolution and low emittance heavyion beams, already in operation at INFN Laboratory Nazionali del Sud in Catania (Italy).

Published
2016
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7. Heavy quark dynamics in the QGP: Towards a solution of the RAA and ν2 puzzle

Author

Scardina F., Das S. K., Plumari S., and Greco V.

Subjects
Physics, QC1-999
Abstract

The two key observables related to heavy quarks that have been measured in experiments are the nuclear suppression factor RAA and the elliptic flow ν2. The simultaneous reproduction of these two observables is a puzzle which have challenged all the existing models. We discuss two ingredients responsible for addressing a large part of such a puzzle: the temperature dependence of the energy loss and the full solution of the Boltzmann collision integral for the scattering between the heavy quarks and the particle of the bulk.

Published
2016
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8. 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., 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., 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., and Zoric M.

Subjects
Physics, QC1-999
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.

Published
2015
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9. Neutron Star masses from the Field Correlator Method Equation of State

Author

Zappalà D., Burgio G. F., Greco V., and Plumari S.

Subjects
Physics, QC1-999
Abstract

We analyse the hadron-quark phase transition in neutron stars by confronting the hadronic Equation of State (EoS) obtained according to the microscopic Brueckner-Hartree-Fock many body theory, with the quark matter EoS derived within the Field Correlator Method. In particular, the latter EoS is only parametrized in terms of the gluon condensate and the large distance quark-antiquark potential, so that the comparison of the results of this analysis with the most recent measurements of heavy neutron star masses provides some physical constraints on these two parameters.

Published
2014
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10. The ASY-EOS experiment at GSI: investigating 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., 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 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.

Subjects
Physics, QC1-999
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. The results obtained from the existing FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model simulations favoured a moderately soft symmetry term, but suffer from a considerable statistical uncertainty. These results have been confirmed by an independent analysis based on the Tübingen QMD simulations. 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. The present status of the data analysis is reported

Published
2014
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11. Anisotropic Flow from Non-equilibrium Initial Condition with a Saturation Scale

Author

Greco V., Ruggieri M., Scardina F., Plumari S., and Puglisi A.

Subjects
Physics, QC1-999
Abstract

A current goal of relativistic heavy ion collisions experiments is to understand the impact of initial non-equilibrium on final observables. A Color Glass Condensate (CGC) as the limiting state of QCD matter at very high density implies initial non-thermal distribution at least for momenta below the saturation scale. In viscous hydrodynamics simulations, a standard Glauber initial condition leads to estimate 4πη/s ~ 1, while employing the Kharzeev-Levin-Nardi (KLN) modeling of the CGC leads to at least a factor of 2 larger η/s. Within a kinetic theory approach based on a relativistic Boltzmann-like transport simulation, our main result is that the out-of-equilibrium initial distribution in p-space reduces the effciency in building-up the elliptic flow. At RHIC energy we find the available data on υ2 are in agreement with a 4πη/s ~ 1 also for KLN initial conditions.

Published
2014
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12. Dynamics of quark-gluon plasma produced in heavy ion collisions

Author

Ruggieri M., Scardina F., Plumari S., and Greco V.

Subjects
Physics, QC1-999
Abstract

In this talk, we report on our results about the computation of isotropization and thermalization times of the quark-gluon plasma produced in relativistic heavy ion collisions, as well as of the elliptic flow. Simulation of the evolving fireball is achieved by solving the relativistic Boltzmann equation for the parton distribution function tuned at a fixed shear viscosity to entropy density ratio η/s. Our results show that the saturation in the initial spectrum reduces the efficiency in building-up the elliptic flow. Moreover both thermalization and isotropization times are quite small, approximately of 1 fm/c, if the system is in a strong coupling regime.

Published
2014
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13. ASY-EOS experiment at GSI

Author

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

Subjects
Physics, QC1-999
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich Heavy-Ion at intermediate energies has been recently 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 197Au+197Au 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.

Published
2012
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14. The nuclear matrix elements of 0νββdecay and the NUMEN project at INFN-LNS

Author

Cappuzzello, F., primary, Agodi, C., additional, Balestra, F., additional, Bijker, R., additional, Bonanno, D., additional, Bongiovanni, D., additional, Branchina, V., additional, Calabrese, S., additional, Calabretta, L., additional, Calanna, A., additional, Calvo, D., additional, Carbone, D., additional, Cavallaro, M., additional, Colonna, M., additional, Ferrero, S., additional, Foti, A., additional, Finocchiaro, P., additional, Giraudo, G., additional, Greco, V., additional, Iazzi, F., additional, Introzzi, R., additional, Lanzalone, G., additional, Lavagno, A., additional, Lo Presti, D., additional, Longhitano, F., additional, Muoio, A., additional, Pandola, L., additional, Rifuggiato, D., additional, Ruslan, M.V., additional, Santopinto, E., additional, Scaltrito, L., additional, Tudisco, S., additional, and Zagatto, V., additional

Published
2016
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15. Alpha-particle clustering in excited expanding self-conjugate nuclei

Author

Borderie, B., Raduta, Ad. R., Ademard, G., Rivet, M. F., De Filippo, E., Geraci, E., Le Neindre, N., Cardella, G., Lanzalone, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Rizzo, F., Russotto, P., Greco, V., La Cognata, M., Spitaleri, C., 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), University of Catania [Italy], Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), and Università degli studi di Catania [Catania]

Subjects
Physics, Nuclear reaction, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, FOS: Physical sciences, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Cluster analysis, Nucleon, Conjugate
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca + 12C at 25 MeV/nucleon was used to produce alpha-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and simultaneous decays, strong indications in favour of $\alpha$-particle clustering in excited 16O, 20Ne and 24}Mg are reported., Comment: 8 pages, 4 figures, 12th International Conference on Nucleus-Nucleus collisions (NN2015), 21-26 June 2015, Catania, Italy

Published
2016

16. Heavy quark dynamics in the QGP: Towards a solution of the RAA and v2 puzzle.

Author

SCARDINA, F., DAS, S. K., PLUMARI, S., and GRECO, V.

Subjects
QUARKS, QUARK-gluon plasma, ENERGY dissipation, BOLTZMANN factor, SCATTERING (Physics)
Abstract

The two key observables related to heavy quarks that have been measured in experiments are the nuclear suppression factor RAA and the elliptic flow v2. The simultaneous reproduction of these two observables is a puzzle which have challenged all the existing models. We discuss two ingredients responsible for addressing a large part of such a puzzle: the temperature dependence of the energy loss and the full solution of the Boltzmann collision integral for the scattering between the heavy quarks and the particle of the bulk. [ABSTRACT FROM AUTHOR]

Published
2016
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17. ASY-EOS experiment at GSI

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, Baran, V., additional, Basrak, Z., additional, Benlliure, J., additional, Boiano, C., additional, Boisjoli, C., additional, Boretzky, K., additional, Brzychczyk, J., additional, Budzanowski, A., additional, Cardella, G., additional, Cammarata, P., additional, Cavallaro, S., additional, Chajecki, Z., additional, Chartier, M., additional, Chbihi, A., additional, Colonna, M., additional, Czech, B., additional, De Filippo, E., additional, Di Toro, M., additional, Famiano, M., additional, Le Fevre, A., additional, Gašsparić, A., additional, Geraci, E., additional, Grassi, L., additional, Greco, V., 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, Kupny, S., additional, Kurz, N., additional, La Guidara, E., additional, Lanzalone, G., additional, Lasko, P., additional, Leifels, Y., additional, Lemmon, R., additional, Li, Q., additional, Lombardo, I., additional, Loria, D., additional, Lukasik, J., additional, Lynch, W.G., additional, Marini, P., additional, Matthews, Z., additional, May, L., additional, Minniti, T., additional, Mostazo, M., additional, Pagano, A., additional, Papa, M., additional, Pawlowski, P., additional, Petrovici, M., additional, Pirrone, S., additional, Politi, G., additional, Porto, F., additional, Reifarth, R., additional, Reisdorf, W., additional, Riccio, F., additional, Rizzo, F., additional, Rosato, E., additional, Rossi, D., additional, Santoro, S., additional, Simon, H., additional, Skwirczynska, I., additional, Sosin, Z., additional, Trautmann, W., additional, Trifirò, A., additional, Trimarchi, M., additional, Tsang, B., additional, Veselsky, M., additional, Verde, G., additional, Vigilante, M., additional, Wieloch, A., additional, Wigg, P., additional, Wilczynski, J., additional, Wolter, H.H., additional, Wu, P., additional, Yennello, S., additional, Zambon, P., additional, Zetta, L., additional, and Zoric, M., additional

Published
2012
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18. Effects of the interstrip gap on the efficiency and response of Double Sided Silicon Strip Detectors

Author

L. Acosta, L. Prepolec, Davor Stanko, N. Soić, A. Di Pietro, Jacopo Forneris, M. Zadro, M. Lattuada, M. Jakic, Veljko Grilj, L. Grassi, P. Figuera, M. Uroić, Matko Milin, V. Tokić, T. Mijatovic, D. Torresi, N. Skukan, Maria Fisichella, Greco, V., La Cognata, M., Pirrone, S., Rizzo, F., and Spitaleri, C.

Subjects
Physics, Proton, Silicon, 010308 nuclear & particles physics, business.industry, Physics::Instrumentation and Detectors, QC1-999, Detector, chemistry.chemical_element, Biasing, Microbeam, 01 natural sciences, Optics, chemistry, 0103 physical sciences, Electrode, Electronic engineering, Electric potential, DSSSD, efficiency, full energy detection, 010306 general physics, business, Energy (signal processing)
Abstract

In this work the effects of the segmentation of the electrodes of Double Sided Silicon Strip Detectors (DSSSDs) are investigated. In order to characterize the response of the DSSSDs we perform a first experiment by using tandem beams of different energies directly sent on the detector and a second experiment by mean of a proton microbeam. Results show that the effective width of the inter-strip region and the efficiency for full energy detection, varies with both detected energy and bias voltage. The experimental results are qualitatively reproduced by a simplified model based on the Shockley-Ramo-Gunn framework.

Published
2016

19. Study of two- and multi-particle correlations in 12C+24Mg and 12C+208Pb reactions at E=35 AMeV

Author

Ismael Martel, A. Chbihi, P. Russotto, B. Gnoffo, D. Dell'Aquila, Lucrezia Auditore, Triestino Minniti, A. Trifirò, L. Quattrocchi, G. Politi, F. Amorini, Luis Acosta, F. Rizzo, M. Trimarchi, S. Norella, F. Porto, A. Anzalone, Giuseppe Verde, A. Grzeszczuk, S. Pirrone, Martin Veselsky, L. Francalanza, E. V. Pagano, G. Cardella, I. Berceanu, Elio Rosato, Ivano Lombardo, A. Pagano, E. De Filippo, Michele Papa, Mariano Vigilante, G. Lanzalone, Dip. Fisica, Università di Messina, 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), V. Greco, M. La Cognata, S. Pirrone, F. Rizzo, C. Spitaleri, Greco, V., Quattrocchi, L., Acosta, L., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cardella, G., Chbihi, A., De Filippo, E., Dell'Aquila, D., Francalanza, L., Gnoffo, B., Grzeszczuk, A., Lanzalone, G., Lombardo, I., Martel, I., Minniti, T., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Rosato, E., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., Veselsky, M., Vigilante, M., 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, VII. Equation of State of Neutron-Rich Nuclear Matter, Clusters in Nuclei and Nuclear, Isotope, QC1-999, Alpha particle, Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, Physics and Astronomy (all), Excited state, 0103 physical sciences, Nuclear Thermodynamics, Heavy ion collisions, Isospin, Particle, Invariant mass, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.ISBN: 978-88-7438-101-2; International audience; Two and multi particle correlations from the decay of sources produced in 12C+24Mg and 12C+208Pb collisions at E=35 AMeV have been studied by using the forward part (1° < θlab < 30°) of the CHIMERA multi-detector. Correlations and invariant mass spectroscopy are used to explore simultaneous and sequential decays of resonances in light isotopes with Z∼3-6, produced in peripheral collisions via the break-up of excited quasi-projectiles. Among them we mention 5Li, 6Li, 6Be, 8Be and the astrophysically important state in 12C decaying into three alpha particles. Results and future perspectives at the INFN-LNS will be presented.

Published
2016

20. Measuring fusion excitation functions with RIBs using the stacked target technique: Problems and possible solutions

Author

A. C. Shotter, M. Lattuada, A. Di Pietro, V. Privitera, C. Marchetta, P. Figuera, Maria Fisichella, Lucia Romano, Chris Ruiz, Mile Zadro, Greco, V., La Cognata, M., Pirrone, S., Rizzo, F., and Spitaleri, C.

Subjects
Excitation function, Fusion, Materials science, business.industry, Activation technique, Physics, QC1-999, Physics and Astronomy (all), Optics, Stack (abstract data type), weakly-bound nuclei, excitation-functions, fusion reactions, Laser beam quality, Atomic physics, business, Beam energy, Excitation, Degradation (telecommunications)
Abstract

For measuring fusion excitation functions, the activation technique with a stack of targets offers the considerable advantage that several reaction energies may be simultaneously measured by using one beam energy. However, its main drawback is the degradation of the beam quality as it passes through the stack due to statistical nature of energy loss processes and any non-uniformity of the stacked targets. If not taken properly into account, this degradation can lead to a wrong determination of the fusion excitation function. In this contribution some results of the investigation of this problem are reported.

Published
2016

21. Using CHIMERA detector at LNS for gamma-particle coincidences

Author

Giuseppe Verde, Chiara Guazzoni, S. Pirrone, M. Trimarchi, D. Dell'Aquila, Lucrezia Auditore, L. Quattrocchi, S. Norella, Andrea Castoldi, F. Rizzo, Mariano Vigilante, G. Politi, G. Cardella, A. Pagano, G. Lanzalone, E. V. Pagano, S. De Luca, Michele Papa, Luis Acosta, Ivano Lombardo, E. De Filippo, N. S. Martorana, L. Francalanza, P. Russotto, A. Trifirò, M.B. Chatterjiee, B. Gnoffo, Greco, V., Cardella, G., Acosta, L., Auditore, L., Chatterjiee, M. B., Castoldi, A., De Filippo, E., Dell'Aquila, D., De Luca, S., Gnoffo, B., Guazzoni, C., Francalanza, L., Lanzalone, G., Lombardo, I., Martorana, N., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Quattrocchi, L., Rizzo, F., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Subjects
Physics, Nuclear physics detectors, gamma ray detection, sezele, QC1-999, Hadron, Carbon-12, Gamma ray, Charged particle, Nuclear physics, Baryon, Physics and Astronomy (all), Neutron, Spin-flip, Atomic physics, Nucleon
Abstract

We have recently evaluated the quality of γ -ray angular distributions that can be extracted in particle-gamma coincidence measurements using the CHIMERA detector at LNS. γ -rays have been detected using the CsI(Tl) detectors of the spherical part of the CHIMERA array. Very clean γ -rays angular distributions were extracted in reactions induced by different stable beams impinging on 12 C thin targets. The results evidenced an effect of projectile spin flip on the γ -rays angular distributions. γ -particle coincidence measurements were also performed in reactions induced by neutron rich exotic beams produced through in-flight fragmentation at LNS. In recent experiments also the Farcos array was used to improve energy and angular resolution measurements of the detected charged particles. Results obtained with both stable and radioactive beams are reported.

Published
2016

22. FAZIA applications

Author

Piantelli S., Casini G., Maurenzig P.R., Olmi A., Barlini S., Bini M., Pasquali G., Pastore G., Poggi G., Stefanini A.A., Valdrè S., Ademard G., Auger L., Bougault R., Bonnet E., Borderie B., Chbihi A., Frankland J.D., Gruyer D., Lopez O., LeNeindre N., Parlog M., Rivet M.F., Vient E., Rosato E., Spadaccini G., Vigilante M., Bruno M., Marchi T., Morelli L., Cinausero M., Degerlier M., Gramegna F., Kordyasz A., Kozik T., Twarog T., Alba R., Maiolino C., Santonocito D., Galichet E., 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), Fazia Collaboration, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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), Greco, V., Piantelli, S., Casini, G., Maurenzig, P. R., Olmi, A., Barlini, S., Bini, M., Pasquali, G., Pastore, G., Poggi, G., Stefanini, A. A., Valdrè, S., Ademard, G., Auger, L., Bougault, R., Bonnet, E., Borderie, B., Chbihi, A., Frankland, J. D., Gruyer, D., Lopez, O., Leneindre, N., Parlog, M., Rivet, M. F., Vient, E., Rosato, E., Spadaccini, G., Vigilante, M., Bruno, M., Marchi, T., Morelli, L., Cinausero, M., Degerlier, M., Gramegna, F., Kordyasz, A., Kozik, T., Twarog, T., Alba, R., Maiolino, C., Santonocito, D., and Galichet, E.

Subjects
Physics and Astronomy (all), 010308 nuclear & particles physics, Physics, QC1-999, Nuclear Theory, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

International audience; The present status and the perspectives of the FAZIA project are presented. The main achievements in terms of identification thresholds and isotopic resolution are discussed, together with the adopted technical solutions. The detector is particularly well suited for the investigation of isospin transport phenomena at intermediate beam energies; perspectives to reduce the identification thresholds to cope with lower energy ISOL beams are briefly introduced. Some experimental results concerning isospin transport effects obtained with a test telescope are presented. The study of isospin transport phenomena can give information on the symmetry energy term of the nuclear equation of state by comparing the experimental results on isospin related observables with the predictions of transport codes.

Published
2016

23. ASY-EOS experiment at GSI

Author

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

Subjects
Physics, sezele, QC1-999, Nuclear Theory, symmetry energy, Observable, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear equation of state, Symmetry (physics), Term (time), Nuclear physics, Physics and Astronomy (all), nucleus-nucleus collisions, Neutron, Nucleon, Nuclear Experiment
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich Heavy-Ion at intermediate energies has been recently 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 197Au+197Au 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. © Owned by the authors, 2012.

Published
2012

24. Highlights of Resonance Measurements With HADES

Author

Epple, E., Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Behnke, C., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Deveaux, C., Dybczak, A., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gill, K., Golubeva, M., Guber, F., Gumberidze, M., Harabasz, S., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Jurkovic, M., Kämpfer, B., Karavicheva, T., Kardan, K., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kotte, R., Krása, Antonín, Krebs, E., Kuc, H., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michel, J., Müntz, C., Münzer, R., Naumann, L., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Petousis, Vlassis, Pietraszko, J., Przygoda, W., Ramstein, B., Rehnisch, L., Reshetin, A., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schmidt-Sommerfeld, K., Schuldes, H., Sellheim, P., Siebenson, J., Silva, L., Sobolev, Y. G., Spataro, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Tsertos, Haralambos, Vasiliev, T., Wagner, V., Wendisch, C., Wirth, J., Wüstenfeld, J., Zanevsky, Y., Zumbruch, P., Bleicher M., Greco V., Aichelin J., Badala A., Fabbietti L., Markert C., van Hees H., and Tsertos, Haralambos [0000-0001-5966-343X]

Subjects
Nuclear physics, Physics, Scattering cross-section, Pion, QC1-999, Detector, Sigma, Resonance, Nuclear Experiment, Phi meson, Lambda
Abstract

This contribution aims to give a basic overview of the latest results regarding the production of resonances in different collision systems. The results were extracted from experimental data collected with HADES that is a multipurpose detector located at the GSI Helmholtzzentrum, Darmstadt. The main points discussed here are: the properties of the strange resonances Λ(1405) and Σ(1385), the role of Δ's as a source of pions in the final state, the production dynamics reflected in form of differential cross sections, and the role of the Φ meson as a source for K- particles. © 2015 Owned by the authors, published by EDP Sciences. 97 Sponsors: Helmholtz International Center for FAIR c/o FIAS INFN-Sezione di Catania University of Texas at Austin Conference code: 119031

Published
2015

25. Investigating hadronic resonances in pp interactions with HADES

Author

Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Behnke, C., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Deveaux, C., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gill, K., Golubeva, M., Guber, F., Gumberidze, M., Harabasz, S., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Jurkovic, M., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kotte, R., Krása, Antonín, Krebs, E., Kuc, H., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michel, J., Müntz, C., Münzer, R., Naumann, L., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Petousis, Vlassis, Pietraszko, J., Ramstein, B., Rehnisch, L., Reshetin, A., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schmidt-Sommerfeld, K., Schuldes, H., Sellheim, P., Siebenson, J., Silva, L., Sobolev, Y. G., Spataro, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Tsertos, Haralambos, Vasiliev, T., Wagner, V., Wendisch, C., Wirth, J., Wüstenfeld, J., Zanevsky, Y., Zumbruch, P., Bleicher M., Greco V., Aichelin J., Badala A., Fabbietti L., Markert C., van Hees H., and Tsertos, Haralambos [0000-0001-5966-343X]

Subjects
Physics, Particle physics, Meson, QC1-999, Partial wave analysis, Hadron, Resonance, Kinetic energy, 7. Clean energy, Nuclear physics, Baryon, Mass spectrum, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment
Abstract

In this paper we report on the investigation of baryonic resonance production in proton-proton collisions at the kinetic energies of 1.25 GeV and 3.5 GeV, based on data measured with HADES. Exclusive channels npπ+ and ppπ0 as well as ppe+e- were studied simultaneously in the framework of a one-boson exchange model. The resonance cross sections were determined from the one-pion channels for Δ(1232) and N(1440) (1.25 GeV) as well as further Δ and N∗ resonances up to 2 GeV/c2 for the 3.5 GeV data. The data at 1.25 GeV energy were also analysed within the framework of the partial wave analysis together with the set of several other measurements at lower energies. The obtained solutions provided the evolution of resonance production with the beam energy, showing a sizeable non-resonant contribution but with still dominating contribution of Δ(1232)P33. In the case of 3.5 GeV data, the study of the ppe+e- channel gave the insight on the Dalitz decays of the baryon resonances and, in particular, on the electromagnetic transition form-factors in the time-like region. We show that the assumption of a constant electromagnetic transition form-factors leads to underestimation of the yield in the dielectron invariant mass spectrum below the vector mesons pole. On the other hand, a comparison with various transport models shows the important role of intermediate ρ production, though with a large model dependency. The exclusive channels analysis done by the HADES collaboration provides new stringent restrictions on the parameterizations used in the models. © 2015 Owned by the authors, published by EDP Sciences. 97 Sponsors: Helmholtz International Center for FAIR c/o FIAS INFN-Sezione di Catania University of Texas at Austin Conference code: 119031

Published
2015

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