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351 results on '"La Guidara, E"'

1. 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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2. Probing clustering in excited alpha-conjugate buclei

Author

Borderie, B., Raduta, Ad. R., Ademard, G., Rivet, M. F., De Filippo, E., Geraci, E., Neindre, N. Le, Alba, R., Amorini, F., Cardella, G., Chatterjee, M., Guinet, D., Lautesse, P., La Guidara, E., Lanzalone, G., Lanzano, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction $^{40}$Ca+$^{12}$C at 25 MeV per nucleon bombarding energy 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, evidence in favor of $\alpha$-particle clustering from excited $^{16}O$, $^{20}Ne$ and $^{24}Mg$ is reported., Comment: 15 pages, 6 figures, accepted in Physics Letters B

Published
2016

3. Dipolar degrees of freedom and Isospin equilibration processes in Heavy Ion collisions

Author

Papa, M., Berceanu, I., Acosta, L., Amorini, F., Agodi, C., Anzalone, A., Auditore, L., Cardella, G., Cavallaro, S., Chatterjee, M. B., De Filippo, E., Francalanza, L., Geraci, E., Grassi, L., Gnoffo, B., Han, J., La Guidara, E., Lanzalone, G., Lombardo, I., Pagano, C. Maiolino T. Minniti A., Pagano, E. V., Pirrone, S., Politi, G., Porto, F., Quattrocchi, L., Rizzo, F., Rosato, E., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

Background: In heavy ion collision at the Fermi energies Isospin equilibration processes occur- ring when nuclei with different charge/mass asymmetries interacts have been investigated to get information on the nucleon-nucleon Iso-vectorial effective interaction. Purpose: In this paper, for the system 48Ca +27 Al at 40 MeV/nucleon, we investigate on this process by means of an observable tightly linked to isospin equilibration processes and sensitive in exclusive way to the dynamical stage of the collision. From the comparison with dynamical model calculations we want also to obtain information on the Iso-vectorial effective microscopic interaction. Method: The average time derivative of the total dipole associated to the relative motion of all emitted charged particles and fragments has been determined from the measured charges and velocities by using the 4? multi-detector CHIMERA. The average has been determined for semi- peripheral collisions and for different charges Zb of the biggest produced fragment. Experimental evidences collected for the systems 27Al+48Ca and 27Al+40Ca at 40 MeV/nucleon used to support this novel method of investigation are also discussed., Comment: Submitted for publication on Phys. Rev. C. 0n 24-oct-2014

Published
2015
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4. DETERMINATION OF IMPACT PARAMETERS IN ALIGNED BREAKUP OF PROJECTILE-LIKE FRAGMENTS IN Au-197+Au-197 COLLISIONS AT 23 A MeV

Author

Cap, T, Siwek-Wilczynska, K, Wilczynski, J, Amorini, F, Auditore, L, Cardella, G, De Filippo, E, Geraci, E, Grassi, L, Grzeszczuk, A, La Guidara, E, Han, J, Kozik, T, Lanzalone, G, Lombardo, I, Najman, R, Nicolis, NG, Pagano, A, Papa, M, Piasecki, E, Pirrone, S, Planeta, R, Politi, G, Rizzo, F, Russotto, P, Skwira-Chalot, I, Trifiro, A, Trimarchi, M, Verde, G, and Zipper, W

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Published
2016

5. Determination of Impact Parameters in Aligned Breakup of Projectile-like Fragments in $^{197}$Au + $^{197}$Au Collisions at 23$A$\,MeV

Author

Cap, T, Siwek-Wilczyńska, K, Wilczyński, J, Amorini, F, Auditore, L, Cardella, G, De Filippo, E, Geraci, E, Grassi, L, Grzeszczuk, A, La Guidara, E, Han, J, Kozik, T, Lanzalone, G, Lombardo, I, Najman, R, Nicolis, NG, Pagano, A, Papa, M, Piasecki, E, Pirrone, S, Płaneta, R, Politi, G, Rizzo, F, Russotto, P, Skwira-Chalot, I, Trifiró, A, Trimarchi, M, Verde, G, and Zipper, W

Subjects
Mathematical Sciences, Physical Sciences, Nuclear & Particles Physics
Published
2016

6. Evidence for a Novel Reaction Mechanism of a Prompt Shock-Induced Fission Following the Fusion of 78Kr and 40Ca Nuclei at E/A =10 MeV

Author

Henry, E., Toke, J., Nyibule, S., Quinlan, M., Schroder, W. U., Ademard, G., Amorini, F., Auditore, L., Beck, C., Berceanu, I., Bonnet, E., Borderie, B., Cardella, G., Chbihi, A., Colonna, M., De Filippo, E., DOnofrio, A., Frankland, J. D., Geraci, E., La Guidara, E., La Commara, M., Lanzalone, G., Lautesse, P., Lebhertz, D., Neindre, N. Le, Lombardo, I., Loria, D., Mazurek, K., Pagano, A., Papa, M., Piasecki, E., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Rosato, E., Rusotto, P., Spadaccini, G., Trifiro, A., Trimarchi, M., Verde, G., Vigilante, M., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

An analysis of experimental data from the inverse-kinematics ISODEC experiment on 78Kr+40Ca reaction at a bombarding energy of 10 AMeV has revealed signatures of a hitherto unknown reaction mechanism, intermediate between the classical damped binary collisions and fusion-fission, but also substantially different from what is being termed in the literature as fast fission or quasi fission. These signatures point to a scenario where the system fuses transiently while virtually equilibrating mass asymmetry and energy and, yet, keeping part of the energy stored in a collective shock-imparted and, possibly, angular momentum bearing form of excitation. Subsequently the system fissions dynamically along the collision or shock axis with the emerging fragments featuring a broad mass spectrum centered around symmetric fission, relative velocities somewhat higher along the fission axis than in transverse direction, and virtually no intrinsic spin. The class of massasymmetric fission events shows a distinct preference for the more massive fragments to proceed along the beam direction, a characteristic reminiscent of that reported earlier for dynamic fragmentation of projectile-like fragments alone and pointing to the memory of the initial mass and velocity distribution., Comment: 5 PAGES, 6 FIGURES

Published
2014

7. Kinematical coincidence method in transfer reactions

Author

Acosta, L., Amorini, F., Auditore, L., Berceanu, I., Cardella, G., Chatterjiee, M. B., De Filippo, E., FrancalanzA, L., Gianì, R., Grassi, L., Grzeszczuk, A., La Guidara, E., Lanzalone, G., Lombardo, I., Loria, D., Minniti, T., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Rosato, E., Russotto, P., Santoro, S., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

A new method to extract high resolution angular distributions from kinematical coincidence measurements in binary reactions is presented. Kinematic is used to extract the center of mass angular distribution from the measured energy spectrum of light particles. Results obtained in the case of 10Be+p-->9Be+d reaction measured with the CHIMERA detector are shown. An angular resolution of few degrees in the center of mass is obtained., Comment: 6 Page 10 Figures submitted to Nuclear Instruments and Methods A

Published
2012
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8. Correlations between isospin dynamics and Intermediate Mass Fragments emission time scales: a probe for the symmetry energy in asymmetric nuclear matter

Author

De Filippo, E., Amorini, F., Auditore, L., Baran, V., Berceanu, I., Cardella, G., Colonna, M., Geraci, E., Gianì, S., Grassi, L., Grzeszczuk, A., Guazzoni, P., Han, J., La Guidara, E., Lanzalone, G., Lombardo, I., Maiolino, C., Minniti, T., Pagano, A., Papa, M., Piasecki, E., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santoro, S., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wilczyński, J., and Zetta, L.

Subjects
Nuclear Experiment
Abstract

We show new data from the $^{64}$Ni+$^{124}$Sn and $^{58}$Ni+$^{112}$Sn reactions studied in direct kinematics with the CHIMERA detector at INFN-LNS and compared with the reverse kinematics reactions at the same incident beam energy (35 A MeV). Analyzing the data with the method of relative velocity correlations, fragments coming from statistical decay of an excited projectile-like (PLF) or target-like (TLF) fragments are discriminated from the ones coming from dynamical emission in the early stages of the reaction. By comparing data of the reverse kinematics experiment with a stochastic mean field (SMF) + GEMINI calculations our results show that observables from neck fragmentation mechanism add valuable constraints on the density dependence of symmetry energy. An indication is found for a moderately stiff symmetry energy potential term of EOS., Comment: Talk given by E. De Filippo 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
2012
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9. The ASY-EOS experiment at GSI: investigating the symmetry energy at supra-saturation densities

Author

Russotto, P., Chartier, M., De Filippo, E., Févre, A. Le, Gannon, S., Gašparić, I., Kiš, M., Kupny, S., Leifels, Y., Lemmon, R. C., Łukasik, J., Marini, P., Pagano, A., 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., 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., Di 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., La Guidara, E., Lanzalone, G., Lasko, P., Li, Q., Lombardo, I., Lynch, W. G., 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., Trifiró, 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
Nuclear Experiment
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
2012
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10. Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV

Author

De Filippo, E., Pagano, A., Russotto, P., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Borderie, B., Bougault, R., Bruno, M., Cap, T., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., Di Toro, M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Grzeszczuk, A., Guazzoni, P., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanò, G., Neindre, N. Le, Lombardo, I., Maiolino, C., Papa, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, G., Pop, A., Porto, F., Rivet, M. F., Rizzo, F., Rosato, E., Schmidt, K., Siwek-Wilczynska, K., Skwira-Chalot, I., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

We present a new experimental method to correlate the isotopic composition of intermediate mass fragments (IMF) emitted at mid-rapidity in semi-peripheral collisions with the emission timescale: IMFs emitted in the early stage of the reaction show larger values of $<$N/Z$>$ isospin asymmetry, stronger angular anisotropies and reduced odd-even staggering effects in neutron to proton ratio $<$N/Z$>$ distributions than those produced in sequential statistical emission. All these effects support the concept of isospin "migration", that is sensitive to the density gradient between participant and quasi-spectator nuclear matter, in the so called neck fragmentation mechanism. By comparing the data to a Stochastic Mean Field (SMF) simulation we show that this method gives valuable constraints on the symmetry energy term of nuclear equation of state at subsaturation densities. An indication emerges for a linear density dependence of the symmetry energy., Comment: 17 pages, 7 figures; submitted to Physical Rev. C

Published
2012
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11. Persistence of odd-even staggering in charged fragment yields from the 112Sn+58Ni collision at 35 MeV/nucleon

Author

Casini, G., Piantelli, S., Maurenzig, P. R., Olmi, A., Bardelli, L., Barlini, S., Benelli, M., Bini, M., Calviani, M., Marini, P., Mangiarotti, A., Pasquali, G., Poggi, G., Stefanini, A. A., Bruno, M., Morelli, L., Kravchuk, V. L., Amorini, F., Auditore, L., Cardella, G., De Filippo, E., Galichet, E., La Guidara, E., Lanzalone, G., Lanzano', G., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Pop, A., Rizzo, F., Russotto, P., Santonocito, D., Trifiro', A., and Trimarchi, M.

Subjects
Nuclear Experiment
Abstract

Odd-even staggering effects on charge distributions are investigated for fragments produced in semiperipheral and central collisions of 112Sn+58Ni at 35 MeV/nucleon. For fragments with Z<16 one observes a clear overproduction of even charges, which decreases for heavier fragments. In peripheral collisions staggering effects persist up to Z about 40. For light fragments, staggering appears to be substantially independent of the centrality of the collisions, suggesting that it is mainly related to the last few steps in the decay of hot nuclei., Comment: 5 pages, 6 figures

Published
2012
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12. Evidence for $\alpha$-particle condensation in nuclei from the Hoyle state deexcitation

Author

Raduta, Ad. R., Borderie, B., Geraci, E., Neindre, N. Le, Napolitani, P., Rivet, M. F., Alba, R., Amorini, F., Cardella, G., Chatterjee, M., De Filippo, E., Guinet, D., Lautesse, P., La Guidara, E., Lanzalone, G., Lanzano, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction $^{40}$Ca+$^{12}$C at 25 MeV/nucleon was used to produce excited states candidates to $\alpha$-particle condensation. Complete kinematic characterization of individual decay events, made possible by a high-granularity 4$\pi$ charged particle multi-detector, reveals that 7.5$\pm$4.0% of the particle decays of the Hoyle state correspond to direct decays in three equal-energy $\alpha$-particles., Comment: Phys. Lett. B, in press

Published
2011
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13. Isospin Diffusion and Equilibration for Sn+Sn collisions at E/A=35 MeV

Author

Sun, Z. Y., Tsang, M. B., Lynch, W. G., Verde, G., Amorini, F., Andronenko, L., Andronenko, M., Cardella, G., Chatterje, M., Danielewicz, P., De Filippo, E., Dinh, P., Galichet, E., Geraci, E., Hua, H., La Guidara, E., Lanzalone, G., Liu, H., Lu, F., Lukyanov, S., Maiolino, C., Pagano, A., Piantelli, S., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., and Zhang, Y. X.

Subjects
Nuclear Experiment
Abstract

Equilibration and equilibration rates have been measured by colliding Sn nuclei with different isospin asymmetries at beam energies of E/A=35 MeV. Using the yields of mirror nuclei of 7Li and 7Be, we have studied the diffusion of isospin asymmetry by combining data from asymmetric 112Sn+124Sn and 124Sn+112Sn collisions with that from symmetric 112Sn+112Sn and 124Sn+124Sn collisions. We use these measurements to probe isospin equilibration in central collisions where nucleon-nucleon collisions are strongly blocked by the Pauli exclusion principal. The results are consistent with transport theoretical calculations that predict a degree of transparency in these collisions, but inconsistent with the emission of intermediate mass fragments by a single chemically equilibrated source. Comparisons with ImQMD calculations are consistent with results obtained at higher incident energies that provide constraints on the density dependence of the symmetry energy., Comment: 13 pages, 3 figures, submitted to PRC Rapid Communications

Published
2010
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14. Production of $\alpha$-particle condensate states in heavy-ion collisions

Author

Raduta, Ad. R., Borderie, B., Geraci, E., Neindre, N. Le, Napolitani, P., Rivet, M. F., Alba, R., Amorini, F., Cardella, G., Chatterjee, M., De Filippo, E., Guinet, D., Lautesse, P., La Guidara, E., Lanzalone, G., Lanzano, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., and Wieleczko, J. P.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction $^{40}Ca$ + $^{12}C$ at 25 MeV/nucleon was used to produce excited states candidates to $\alpha$-particle condensation. The experiment was performed at LNS-Catania using the CHIMERA multidetector. Accepting the emission simultaneity and equality among the $\alpha$-particle kinetic energies as experimental criteria for deciding in favor of the condensate nature of an excited state, we analyze the $0_2^+$ and $2_2^+$ states of $^{12}$C and the $0_6^+$ state of $^{16}$O. A sub-class of events corresponding to the direct 3-$\alpha$ decay of the Hoyle state is isolated., Comment: contribution to the 2nd Workshop on "State of the Art in Nuclear Cluster Physics" (SOTANCP2), Universite Libre de Bruxelles (Belgium), May 25-28, 2010, to be published in the International Journal of Modern Physics E

Published
2010
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15. Alpha-particle condensation in excited 12C

Author

Raduta, Ad. R., Borderie, B., Geraci, E., Neindre, N. Le, Napolitani, P., Rivet, M. F., Alba, R., Amorini, F., Cardella, G., Chatterjee, M., De Filippo, E., Guinet, D., Lautesse, P., La Guidara, E., Lanzalone, G., Lanzano, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction $^{40}Ca$+$^{12}C$ at 25 MeV/nucleon was used to produce excited states candidates to $\alpha$-particle condensation. The methodology relies on high granularity 4$\pi$ detection coupled to correlation function techniques. Under the assumption that the equality among the kinetic energies of the emitted $\alpha$-particles and the emission simultaneity constitutes a reliable fingerprint of $\alpha$ condensation, we identify several tens of events corresponding to the deexcitation of the Hoyle state of $^{12}$C which fulfill the condition., Comment: 5 pages, 3 figures

Published
2010

16. Isospin Dependence of Incomplete Fusion Reactions at 25 Mev/a

Author

Amorini, F., Cardella, G., Giuliani, G., Papa, M., Agodi, C., Alba, R., Anzalone, A., Berceanu, I., Cavallaro, S., Chatterjee, M. B., Coniglione, R., De Filippo, E., Di Pietro, A., Geraci, E., Grassi, L., Grzeszczuk, A., Figuera, P., La Guidara, E., Lanzalone, G., Neindre, N. Le, Lombardo, I., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., Sapienza, P., and Verde, G.

Subjects
Nuclear Experiment
Abstract

40Ca+40,48Ca,46Ti reactions at 25 MeV/A have been studied using the 4p CHIMERA detector. An isospin effect on the competition between incomplete fusion and dissipative binary reaction mechanisms has been observed. The probability of producing a compound system is observed to be lower in the case of N=Z colliding systems as compared to the case of reactions induced on the more neutron rich 48Ca target. Predictions based on CoMD-II calculations show that the competition between fusion-like and dissipative reactions, for the selected centrality, can strongly constraint the parameterization of symmetry energy and its density dependence in the nuclear equation of state., Comment: 4 pages 3 figures submitted to phys.rew.Lett

Published
2008
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17. Isospin influence on fragments production in 78Kr + 40Ca and 86Kr + 48Ca collisions at 10 MeV/nucleon

Author

Pirrone, S., Politi, G., Gnoffo, B., La Commara, M., De Filippo, E., Russotto, P., Trimarchi, M., Vigilante, M., Colonna, M., Kalandarov, Sh. A., Amorini, F., Auditore, L., Beck, C., Cardella, G., D’Onofrio, A., Geraci, E., Lacroix, D., La Guidara, E., Lanzalone, G., Pagano, A., Pagano, E. V., Papa, M., Piasecki, E., Quattrocchi, L., Rizzo, F., Rosato, E., Spadaccini, G., and Trifirò, A.

Published
2019
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18. A new monolithic silicon detector telescope with bidimensional sensitivity for imaging applications

Author

Amorini, F., Sipala, V., Cardella, G., Auditore, L., Boiano, C., Carbone, B., Castoldi, A., Di Pietro, A., Fallica, G., Figuera, P., Finocchiaro, P., Grassi, L., La Guidara, E., Guazzoni, C., Guazzoni, P., Lombardo, I., Loria, D., Pappalardo, A., Pirrone, S., Randazzo, N., Rizzo, F., Russo, G.V., Russotto, P., Scirè, C., Scirè, S., Trifirò, A., Trimarchi, M., Valvo, G., and Zetta, L.

Published
2010
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19. The symmetry energy at suprasaturation density and the ASY-EOS experiment at GSI

Author

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
Physics, QC1-999
Abstract

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
2017
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20. Isospin aspects in nuclear reactions involving Ca beams at 25 MeV/nucleon

Author

Lombardo, I., Agodi, C., Alba, R., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cardella, G., Cavallaro, S., Chatterjee, M. B., De Filippo, E., Di Pietro, A., Figuera, P., Giuliani, G., Geraci, E., Grassi, L., Grzeszczuk, A., Han, J., La Guidara, E., Lanzalone, G., Le Neindre, N., Loria, D., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Published
2011
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21. Imaging monolithic silicon detector telescopes

Author

Amorini, F., Sipala, V., Cardella, G., Boiano, C., Carbone, B., Cosentino, L., Costa, E., Di Pietro, A., Emanuele, U., Fallica, G., Figuera, P., Finocchiaro, P., La Guidara, E., Marchetta, C., Pappalardo, A., Piazza, A., Randazzo, N., Rizzo, F., Russo, G.V., Russotto, P., Scirè, C., Scirè, S., Trifirò, A., Trimarchi, M., and Valvo, G.

Published
2008
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22. Digital signal processing for mass identification in a 4[pi]--detector, using time of flight measurement

Author

Amorini, F., Anzalone, A., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., De Filippo, E., Guazzoni, P., La Guidara, E., Lanzano, G., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Riccio, F., Rizzo, F., Russo, S., Russotto, P., and Zetta, L.

Subjects
Algorithms -- Methods, Signal processing -- Methods, Radiation warning systems -- Properties, Radiation -- Measurement, Radiation -- Methods, Algorithm, Digital signal processor, Business, Electronics, Electronics and electrical industries
Abstract

CHIMERA is the only 4[pi]-multidetector, used in intermediate nuclear physics experiments, able to perform mass identification of the reaction products. To this purpose, it employs time of flight measurements done with traditional time to digital converters. In order to improve the resolution in mass identification, we have applied digital signal processing to time of flight measurements. This paper presents the methodology for data analysis, the adopted algorithms and the results obtained at different sampling frequencies (mass identification up to A = 33 for the reaction products produced by a 20.5 MeV/u [sup.20]Ne beam on [sup.27]Al target). Index Terms--Mass identification, nuclear measurements, nuclear physics, online digital signal processing, time of flight measurement.

Published
2008

23. Isospin influence on the decay modes of the systems produced in the 78,86Kr +40,48Ca reactions at 10 AMeV

Author

Gnoffo B., Pirrone S., Politi G., La Commara M., Wieleczko J.P., De Filippo E., Russotto P., Trimarchi M., Vigilante M., Ademard G., Amorini F., Auditore L., Beck C., Bercenau I., Bonnet E., Borderie B., Cardella G., Chibihi A., Colonna M., D’Onofrio A., Frankland J.D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., LeNeidre N., Lombardo I., Mazurek K., Norella S., Pagano A., Pagano E.V., Papa M., Piasecki E., Porto F., Quattrocchi L., Quinlann M., Rizzo F., Shoroeder U., Spadaccini G., Trifirò A., Toke J., and Verde G.

Subjects
Physics, QC1-999
Abstract

The results of the analysis of the reactions 78,86Kr +40,48 Ca at 10 AMeV are presented. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multidetector CHIMERA, with beams delivered by the Superconductive Cyclotron. The competition among the various disintegration paths and in particular the isospin effects on the decay modes of the produced composite systems are investigated; this provides information about fundamental nuclear quantities such as level density, fission barrier and viscosity. Different isotopic composition and relative richness are observed among the reaction products of the two systems. An odd-even staggering effect is present in the charge distributions, in particular for the light fragments produced by the neutron-poor system. The kinematical characteristics of the IMF seem to indicate a high degree of the relaxation of the formed system. Besides, global features analysis seems to show some differences in the contribution arising from the various reaction mechanisms for the two reactions.

Published
2016
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24. Isospin influence on the decay modes of compound systems produced in the 78,86Kr + 40,48Ca at 10 AMeV

Author

Pirrone S., Politi G., Wieleczko J.P., De Filippo E., Gnoffo B., Russotto P., Trimarchi M., La Commara M., Vigilante M., Ademard G., Amorini F., Auditore L., Beck C., Berceanu I., Bonnet E., Borderie B., Cardella G., Chibihi A., Colonna M., D’Onofrio A., Frankland J. D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., Le Neindre N., Lombardo I., Mazurek K., Norella S., Pagano A., Pagano E.V., Papa M., Piasecki E., Porto F., Quattrocchi L., Quinlann M., Rizzo F., Schroeder W. U., Spadaccini G., Trifirò A., Toke J., and Verde G.

Subjects
Physics, QC1-999
Abstract

The study of the decay modes competition of the compound systems produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10AMeV is presented. In particular, the N/Z entrance channel influence on the decay paths of the compound systems, directly connected to the isospin influence, is investigated. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multi-detector CHIMERA. Charge, mass, angular distributions and kinematical features of the reaction products were studied. The analysis shows some differences in the contribution arising from the various reaction mechanisms for the neutron poor and neutron rich systems. Comparison with theoretical statistical and dynamical models are presented for the two systems. Besides a study of the influence of the energy on the entrance channel is performed for the 78Kr+40Ca reaction, by comparing the results of this experiment to those obtained for the same system at 5.5 AMeV with the INDRA device at GANIL.

Published
2016
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25. 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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26. On-board digital signal processing for 4 [pi]-detector large-area telescopes

Author

Amorini, F., Anzalone, A., Cardella, G., Cavallaro, S., De Filippo, E., Guazzoni, P., La Guidara, E., Lanzano, G., Pagano, A., Pirrone, S., Politi, G., Porto, F., Riccio, F., Rizzo, F., Russo, S., Russotto, P., and Zetta, L.

Subjects
Digital signal processors -- Research, Nuclear physics -- Research, Telescope -- Research, Digital signal processor, Business, Electronics, Electronics and electrical industries
Abstract

The digital pulse shape data acquisition (DAQ) system used by the large area telescopes of the 4[pi]-multidetector CHIMERA requires transferring large amount of data to the computer. This is necessary so that the same information can be extracted from the detector pulses as in previous analog based systems. To overcome this problem, we have used a sampling ADC-board equipped with two TigerSHARC digital signal processors. The board receives the data and reconstructs the event parameters online. The data volume is significantly reduced by transmitting to the DAQ only the reconstructed event parameters. Index Terms--Digital signal processors, mass and charge identification, nuclear measurements, nuclear physics, online and on-board digital signal processing.

Published
2007

27. Particle identification via pulse shape analysis for large-area silicon detectors of the CHIMERA array

Author

Alderighi, M., Amorini, F., Anzalone, A., Arena, N., Auditore, L., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., Chatterjee, M.B., D'Andrea, M., De Filippo, E., Fichera, F., Geraci, E., Giustolisi, F., Guardone, N., Grimaldi, A., Guazzoni, P., La Guidara, E., Lanzano, G., Lanzalone, G., Maiolino, C., Nicotra, D., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Pullia, A., Rizzo, F., Russo, S., Russotto, P., Santonocito, D., Sacca, G., Sassi, M., Schroder, W. Udo, Sechi, G.R., Trifiro, A., Toke, J., Trimarchi, M., Urso, S., and Zetta, L.

Subjects
Silicon diodes -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

Mass and atomic-number identification (ID) of reaction products is a fundamental requirement of any nuclear reaction study. An effective particle-ID method is demonstrated, based on pulse shape analysis/discrimination (PSD) applied to large-area, single-element silicon detectors. This technique uses commercial electronic modules and achieves atomic number resolution rivaling that typically obtained with multi-element ([DELTA]E-E) detector telescopes. The method is applied to the CHIMERA detector system without compromising its time-of-flight (TOF) resolution. In-beam tests of the PSD method have been performed with large-area, 300-[micro]m thick CHIMERA silicon detectors, measuring particles from the [sup.19]F + [sup.12]C reaction at Tandem energies. Performance of a simple PSD set up is discussed, for front and rear particle injection. Index Terms--Charge identification, planar silicon detector, pulse shape.

Published
2005

28. Status and perspectives of fragmentation beams at LNS with CHIMERA detector

Author

Cardella G., Acosta L., Amorini F., Auditore L., Berceanu I., Chatterjiee M.B., De Filippo E., Francalanza L., Grassi L., La Guidara E., Lanzalone G., Lombardo I., Minniti T., Pagano A., Pagano E.V., Papa M., Pirrone S., Politi G., Quattrocchi L., Rizzo F., Rosato E., Russotto P., Trifirò A., Trimarchi M., Verde G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

Relatively large yields of various exotic beams produced through in-flight fragmentation are available at LNS. Using the CHIMERA detector, we performed various experiments to study elastic and inelastic scattering, transfer, break-up, and reaction dynamics with targets from proton and deuteron to carbon and heavier. For reactions with relatively light systems we used the kinematical coincidence method to extract high resolution angular distributions of binary reactions from the measured light particle energy spectra. We also used the CsI detectors of CHIMERA to detect gamma rays emitted in the reactions. Some of most recent results are presented together with future perspectives with the coupling of CHIMERA with FARCOS array.

Published
2015
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29. 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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30. Polar-side emission of heavy IMFs in 197Au + 197Au collisions at 23A MeV

Author

Cap T., Siwek-Wilczyńska K., Skwira-Chalot I., Wilczyński J., Amorini F., Auditore L., Cardella G., De Filippo E., Geraci E., Grassi L., Grzeszczuk A., La Guidara E., Han J., Kozik T., Lanzalone G., Lombardo I., Najman R., Nicolis N. G., Pagano A., Papa M., Piasecki E., Pirrone S., Płaneta R., Politi G., Rizzo F., Russotto P., Trifirò A., Trimarchi M., Verde G., and Zipper W.

Subjects
Physics, QC1-999
Published
2015
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31. Decay competition for IMF produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10 A·MeV

Author

La Commara M., Pirrone S., Politi G., Wieleczko J.P., Ademard G., De Filippo E., Vigilante M., Amorini F., Auditore L., Beck C., Berceanu I., Bonnet E., Borderie B., Cardella G., Chbihi A., Colonna M., Frankland J.D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., Le Neindre N., Lombardo I., Loria D., Mazurek K., Pagano A., Papa M., Piasecki E., Porto F., Quinlann M., Rivet M.F., Rizzo F., Rosato E., Russotto P., Schroeder W.U., Spadaccini G., Trifirò A., Toke J., Trimarchi M., and Verde G.

Subjects
Physics, QC1-999
Abstract

Decay modes of excited compound systems 118Ba and 134Ba, produced respectively in the 78Kr+40Ca and 86Kr+48Ca collisions at 10 A·MeV, are investigated. In particular, the competition between the various disintegration path of medium mass compound nuclei, formed by fusion processes, the production of the so referred Intermediate Mass Fragments (IMF), and the isospin dependence of the decay process are studied. Data were taken at the INFN-Laboratori Nazionali del Sud (LNS) by using the CHIMERA array. Data analysis is in progress; a first indication on the average-energy angular distributions suggests pre-equilibrium effects affecting the data and the presence of isotopical effects.

Published
2014
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32. Exploring reaction mechanisms and their competition in 58Ni+48Ca collisions at E = 25 AMeV

Author

Francalanza L., Abbondanno U., Amorini F., Barlini S., Bini M., Bougault R., Bruno M., Cardella G., Casini G., Colonna M., D’Agostino M., De Filippo E., De Sanctis J., Geraci E., Giussani A., Gramegna F., Guiot B., Kravchuk V., La Guidara E., Lanzalone G., Le Neindre N., Maiolino C., Marini P., Morelli L., Olmi A., Pagano A., Papa M., Piantelli S., Pirrone S., Politi G., Poggi G., Porto F., Russotto P., Rizzo F., Vannini G., and Vannucci L.

Subjects
Physics, QC1-999
Abstract

Latest results concerning the study of central collisions in 58Ni+48Ca reactions at Elab(Ni)=25 AMeV are presented. The experimental data, collected with the CHIMERA 4π device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain. The method adopted to perform the centrality selection refers to the global variable “flow angle”, that is related to the event shape in momentum space, as it is determined by the eigenvectors of the experimental kinetic-energy tensor. The main features of the reaction products were explored by using different constraints on some of the relevant observables, such as mass and velocity distributions and their correlations. Much emphasis was devoted to the competition between fusion-evaporation processes with subsequent identification of a heavy residue and a prompt multifragmentation mechanism. The reaction mechanism was simulated in the framework of transport theories (dynamical stochastic BNV calculations, followed by sequential SIMON code) and further comparison with dynamical calculations from transport model (QMD, CoMD) are in progress. Moreover, an extension of this study taking into account for the light particles has been envisaged.

Published
2014
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33. Probing the symmetry energy at low density using observable from neck fragmentation

Author

De Filippo E., Acosta L., Agodi C., Amorini F., Auditore L., Baran V., Berceanu I., Cap T., Cardella G., Colonna M., Francalanza L., Geraci E., Gianì R., Grassi L., Grzeszczuk A., Guazzoni P., Han J., La Guidara E., Lanzalone G., Lombardo I., Maiolino C., Minniti T., Pagano A., Pagano E.V., Papa M., Piasecki E., Płaneta R., Pirrone S., Politi G., Pop A., Porto F., Quattrocchi L., Rizzo F., Rosato E., Russotto P., Siwek-Wilczyńska K., Skwira-Chalot I, Trifirò A., Trimarchi M., Verde G., Vigilante M., Wilczyński J., and Zetta L.

Subjects
Physics, QC1-999
Abstract

Semi-peripheral collisions of 64Ni + 124Sn in direct and inverse kinematics, at 35 A MeV incident energy, are studied to characterize the dynamical origin and align-ments properties of fragments emission at midrapidity. This emission is partly due to the fragmentation of a transient neck joining the projectile and target in the early stages of the reaction. Recently we exploited observable from neck fragmentation to constraint the density dependence of the symmetry energy. In this contribution we focus on the density evolution of the mid-rapidity source. An experimental survey is suggested to check if data are consistent with the formation of neck fragments in a dilute density region in contact with the projectile-like and target-like spectators at normal saturation density.

Published
2014
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34. 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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35. Isotope correlations as a probe for freeze-out characterization: central 124Sn+ 64Ni, 112Sn+ 58Ni collisions

Author

Geraci, E., Alderighi, M., Anzalone, A., Auditore, L., Baran, V., Bartolucci, M., Berceanu, I., Blicharska, J., Bonasera, A., Borderie, B., Bougault, R., Bruno, M., Brzychczyk, J., Cardella, G., Cavallaro, S., Chbihi, A., Cibor, J., Colonna, M., D'Agostino, M., De Filippo, E., Di Toro, M., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Iacono-Manno, M., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzano´, G., Le Neindre, N., Li, S., Lo Nigro, S., Maiolino, C., Majka, Z., Manfredi, G., Paduszynski, T., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Politi, G., Pop, A., Porto, F., Rivet, M.F., Rosato, E., Russo, S., Russotto, P., Sechi, G., Simion, V., Sperduto, M.L., Steckmeyer, J.C., Trifiro`, A., Trimarchi, M., Vannini, G., Vigilante, M., Wieleczko, J.P., Wilczynski, J., Wu, H., Xiao, Z., Zetta, L., and Zipper, W.

Published
2004
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36. Fragmentation studies with the CHIMERA detector at LNS in Catania: recent progress

Author

Pagano, A., Alderighi, M., Amorini, F., Anzalone, A., Arena, L., Auditore, L., Baran, V., Bartolucci, M., Berceanu, I., Blicharska, J., Brzychczyk, J., Bonasera, A., Borderie, B., Bougault, R., Bruno, M., Cardella, G., Cavallaro, S., Chatterjee, M.B., Chbihi, A., Cibor, J., Colonna, M., D'Agostino, M., Dayras, R., De Filippo, E., Di Toro, M., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Iacono-Manno, M., Kowalski, S., La Guidara, E., Lanzano, G., Lanzalone, G., Le Neindre, N., Li, S., Lo Nigro, S., Maiolino, C., Majka, Z., Manfredi, G., Paduszynski, T., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, G., Pop, A., Porto, F., Rivet, M.F., Rosato, E., Rizzo, F., Russo, S., Russotto, P., Sassi, M., Sechi, G., Simion, V., Siwek-Wilczynska, K., Skwira, I., Sperduto, M.L., Steckmeyer, J.C., Swiderski, L., Trifiro`, A., Trimarchi, M., Vannini, G., Vigilante, M., Wieleczko, J.P., Wilczynski, J., Wu, H., Xiao, Z., Zetta, L., and Zipper, W.

Published
2004
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37. Isoscaling in central 124Sn+ 64Ni, 112Sn+ 58Ni collisions at 35 A MeV

Author

Geraci, E., Bruno, M., D'Agostino, M., De Filippo, E., Pagano, A., Vannini, G., Alderighi, M., Anzalone, A., Auditore, L., Baran, V., Barnà, R., Bartolucci, M., Berceanu, I., Blicharska, J., Bonasera, A., Borderie, B., Bougault, R., Brzychczyk, J., Cardella, G., Cavallaro, S., Chbihi, A., Cibor, J., Colonna, M., De Pasquale, D., Di Toro, M., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Iacono-Manno, M., Italiano, A., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanó, G., Le Neindre, N., Li, S., Lo Nigro, S., Maiolino, C., Majka, Z., Manfredi, G., Paduszynski, T., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Politi, G., Pop, A., Porto, F., Rivet, M.F., Rosato, E., Russo, S., Russotto, P., Sechi, G., Simion, V., Sperduto, M.L., Steckmeyer, J.C., Trifirò, A., Trimarchi, M., Vigilante, M., Wieleczko, J.P., Wilczynski, J., Wu, H., Xiao, Z., Zetta, L., and Zipper, W.

Published
2004
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38. Mapping the demise of collective motion in nuclei at high excitation energy

Author

Santonocito, D., Blumenfeld, Y., Maiolino, C., Agodi, C., Alba, R., Bellia, G., Coniglione, R., Del Zoppo, A., Hongmei, F., Migneco, E., Piattelli, P., Sapienza, P., Auditore, L., Cardella, G., De Filippo, E., La Guidara, E., Monrozeau, C., Papa, M., Pirrone, S., Rizzo, F., Trifiró, A., Trimarchi, M., Huang, H.X., and Wieland, O.

Published
2018
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39. 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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40. FARCOS, a new array for femtoscopy and correlation spectroscopy

Author

La Guidara E., Guazzoni C., Gianì S., Geraci E., Francalanza L., De Filippo E., Chbihi A., Cardella G., Buscemi M., Auditore L., Anzalone A., Amorini F., Verde G., Minniti T., Pagano E.V., Acosta L., Lanzalone G., Lombardo I., Lo Nigro S., Loria D., Maiolino C., Martel I., Pagano A., Papa M., Pirrone S., Politi G., Porto F., Rizzo F., Russotto P., Sánchez-Bentez A.M., Duenas J.A., Berjillos R., Santoro S., Trifirò A., Trimachi M., Venhart M., Veselsky M., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

Correlations between two or more particles can be used as a tool to explore the space-time features of nuclear reactions as well as spectroscopic properties of produced unbound clusters. In order to have new options to study the mentioned correlations, FARCOS (Femtoscope ARray for COrrelations and Spectroscopy) has been conceived as a compact high resolution array, composed of square telescopes. In this work the main features of FARCOS array as well as part of the physics cases are described.

Published
2012
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41. Decay modes of the systems formed in the reactions 78Kr+40Ca and 86Kr+48Ca

Author

Colonna M., Chbihi A., Cardella G., Borderie B., Bonnet E., Berceanu I., Beck C., Auditore L., Amorini F., Vigilante M., De Filippo E., Ademard G., Wieleczko J.P., Politi G., Pirrone S., La Commara M., D’Onofrio A., Frankland J. D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., Le Neindre N., Lombardo I., Loria D., Mazurek K., Pagano A., Papa M., Piasecki E., Porto F., Quinlannl M., Rizzo F., Rosato E., Russotto P., Schroeder W. U., Spadaccini G., Trifirò A., Tõke J., Trimarchi M., and Verde G.

Subjects
Physics, QC1-999
Abstract

Preliminary outcome of ISODEC experiment, performed at INFNLNS with the CHIMERA array, are presented. Disintegration path dependence on the entrance-channel N/Z ratios (isospin asymmetries) for the reactions 78Kr+40Ca and 86Kr+48Ca at 10 A·MeV, which give origin to the intermediate systems 118Ba and 134Ba, is being investigated. Staggering effects seem to be present as it was the case of a complementary measurement performed at GANIL at lower energy, i.e. 78,82Kr+40Ca at 5.5 A·MeV.

Published
2012
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42. Use of fragmentation beams at LNS with CHIMERA detector

Author

Gianí R., Francalanza L., DeFilippo E., Chatterjiee M. B., Buscemi M., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Acosta L., Cardella G., Grassi L., La Guidara E., Lanzalone G., Lombardo I., Loria D., Minniti T., Pagano A., Pagano E. V., Papa M., Pirrone S., Politi G., Porto F., Rizzo F., Rosato E., Russotto P., Santoro S., Trifiró A., Trimarchi M., Verde G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

The recent intensity upgrade of the LNS fragmentation beam is discussed. The available beams, the tagging procedures and details on the beam quality are reported. The experimental program started with the CHIMERA detector using such beams is also discussed with preliminary results and future perspectives.

Published
2012
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43. Global characteristics of 197Au + 197Au collisions at 23 AMeV

Author

Bubak A., Auditore L., Amorini F., Sochocka A., Płaneta R., Najman R., Cap T., Cardella G., De Filippo E., Geraci E., Grassi L., Grzeszczuk A., La Guidara E., Han J., Loria D., Kowalski S., Kozik T., Lanzalone G., Lombardo I., Majka Z., Nicolis N. G., Pagano A., Piasecki E., Pirrone S., Politi G., Rizzo F., Russotto P., Siwek-Wilczyéska K., Skwira-Chalot I., Trifiró A., Trimarchi M., Wilczyński J., Verde G., and Zipper W.

Subjects
Physics, QC1-999
Abstract

We present the current status of nuclear dynamics studies performed by the BREAKUP group with the 4π CHIMERA array, for the system 197Au + 197Au at 23 AMeV.

Published
2012
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44. Isoscaling in dissipative projectile breakup

Author

Amorini F., Schröder J.D., Henry E., Pawelczak I., Tõoke J., Quinlan M.J., Singh H., Anzalone A., Maiolino C., Auditore L., Loria D., Trifirò A., Trimarchi M., Cardella G., De Filippo E., Pagano A., Papa M., Pirrone S., Verde G., Chatterjee M.B., Cavallaro S., Geraci E., Lo Nigro S., Politi G., Porto F., Rizzo F., Russotto P., Grzeszczuk A., Guazzoni P., Zetta L., La Guidara E., Lanzalone G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

Dynamical breakup of projectile-like fragments (PLF) following dissipative reactions of 48 Ca projectiles with 112 Sn and 124 Sn is shown to exhibit “isoscaling” regularities that can be understood in terms of phase space governed by ground state masses. Ambiguities in isoscaling parameters obscure information on nuclear symmetry energy at subnormal densities.

Published
2012
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45. Mapping the GDR Quenching in Nuclei of Mass $A=120$--132

Author

Santonocito, D., primary, Blumenfeld, Y., additional, Maiolino, C., additional, Alba, R., additional, Bellia, G., additional, Coniglione, R., additional, Del Zoppo, A., additional, Migneco, E., additional, Piattelli, P., additional, Sapienza, P., additional, Auditore, L., additional, Cardella, G., additional, De Filippo, E., additional, La Guidara, E., additional, Monrozeau, C., additional, Papa, M., additional, Pirrone, S., additional, Rizzo, F., additional, Trifiró, A., additional, Trimarchi, M., additional, Huang, H.X., additional, and Wieland, O., additional

Published
2019
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46. Competition Between Dynamical and Sequential Reaction Channels in $^{197}$Au+$^{197}$Au Collisions at a Bombarding Energy of 23$A$ MeV

Author

Cap, T., primary, Siwek-Wilczyńska, K., additional, Wilczyński, J., additional, Auditore, L., additional, Cardella, G., additional, De Filippo, E., additional, Geraci, E., additional, Grzeszczuk, A., additional, La Guidara, E., additional, Gnoffo, G., additional, Kozik, T., additional, Lanzalone, G., additional, Lombardo, I., additional, Martorama, M., additional, Najman, R., additional, Nicolis, N.G., additional, Pagano, A., additional, Pagano, E.V., additional, Papa, M., additional, Piasecki, E., additional, Pirrone, S., additional, Płaneta, R., additional, Politi, G., additional, Rizzo, F., additional, Russotto, P., additional, Skwira-Chalot, I., additional, Trifiró, A., additional, Trimarchi, M., additional, Verde, G., additional, and Zipper, W., additional

Published
2019
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47. ISODEC Experiment: study and comparison of the decay mode of 78Kr+40Ca and 86Kr+48Ca systems at 10 AMeV

Author

Piasecki E., Papa M., Pagano A., Mazurek K., Loria D., Lombardo I., Le Neindre N., Lebhertz D., Lautesse P., Lanzalone G., La Guidara E., Henry E., Geraci E., Frankland J.D., D’Onofrio A., Colonna M., Chbihi A., Cardella G., Borderie B., Bonnet E., Berceanu I., Beck C., Auditore L., Amorini F., Vigilante M., De Filippo E., Ademard G., Wieleczko J.P., La Commara M., Politi G., Pirrone S., Porto F., Quinlann M., Rizzo F., Rosato E., Russotto P., Schroeder W.U., Spadaccini G., Trifirò A., Toke J., Trimarchi M., and Verde G.

Subjects
Physics, QC1-999
Abstract

We present the first results of the ISODEC experiment, performed at the INFN-LNS with the CHIMERA device, in order to study the competition between the various disintegration modes of 118,134Ba compound nuclei produced by bombarding 40,48Ca targets with beams of 78,86Kr at 10 AMeV. This work aims thus to explore the isospin dependence of the decay modes of medium mass compound nuclei formed by fusion processes. The experiment complements data already obtained at 5.5 MeV/A for 78,82Kr+40Ca reactions, studied by Ademard et al. with beams delivered by GANIL facility and by using the INDRA detector.

Published
2011
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48. Particle identification method in the CsI(Tl) scintillator used for the CHIMERA 4 π detector

Author

Alderighi, M, Anzalone, A, Basssini, R, Berceanu, I, Blicharska, J, Boiano, C, Borderie, B, Bougault, R, Bruno, M, Calí, C, Cardella, G, Cavallaro, Sl, D'Agostino, M, D'Andrea, M, Dayras, R, De Filippo, E, Fichera, F, Geraci, E, Giustolisi, F, Grzeszczuk, A, Guardone, N, Guazzoni, P, Guinet, D, Iacono-Manno, C.M, Kowalski, S, La Guidara, E, Lanchais, A.L, Lanzalone, G, Lanzanó, G, Le Neindre, N, Li, S, Maiolino, C, Majka, Z, Manfredi, G, Nicotra, D, Paduszynski, T, Pagano, A, Papa, M, Petrovici, C.M, Piasecki, E, Pirrone, S, Politi, G, Pop, A, Porto, F, Rivet, M.F, Rosato, E, Saccá, G, Sechi, G, Simion, V, Sperduto, M.L, Steckmeyer, J.C, Trifiró, A, Trimarchi, M, Urso, S, Vannini, G, Vigilante, M, Wilczynski, J, Wu, H, Xiao, Z, Zetta, L, and Zipper, W

Published
2002
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49. Probing clustering in excited alpha-conjugate nuclei

Author

Borderie, B., Raduta, Ad.R., Ademard, G., Rivet, M.F., De Filippo, E., Geraci, E., Le Neindre, N., Alba, R., Amorini, F., Cardella, G., Chatterjee, M., Guinet, D., Lautesse, P., La Guidara, E., Lanzalone, G., Lanzano, G., Lombardo, I., Lopez, O., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., and Wieleczko, J.P.

Published
2016
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50. Study of the $^{78,86}$Kr$+^{40,48}$Ca Reactions at 10\,$A$\,MeV: Comparison with Theoretical Models

Author

Trimarchi, M., primary, Pirrone, S., additional, Politi, G., additional, Gnoffo, B., additional, Wieleczko, J.P., additional, La Commara, M., additional, De Filippo, E., additional, Russotto, P., additional, Vigilante, M., additional, Colonna, M., additional, Kalandarov, Sh.A., additional, Amorini, F., additional, Auditore, L., additional, Beck, C., additional, Bonnet, E., additional, Borderie, B., additional, Cardella, G., additional, Chbihi, A., additional, D'Onofrio, A., additional, Frankland, J., additional, Geraci, E., additional, La Guidara, E., additional, Lanzalone, G., additional, Lautesse, P., additional, Le Neindre, N., additional, Mazurek, K., additional, Pagano, A., additional, Pagano, E.V., additional, Papa, M., additional, Piasecki, E., additional, Quattrocchi, L., additional, Rizzo, F., additional, Rosato, E., additional, Spadaccini, G., additional, Trifirò, A., additional, and Verde, G., additional

Published
2018
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