| Thème(s) : |
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Physique/Physique Nucléaire Expérimentale
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| Titre : |
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Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV |
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| Auteur : |
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E. De Filippo, A. Pagano, P. Russotto, F. Amorini, A. Anzalone, L. Auditore, V. Baran, I. Berceanu, B. Borderie1, R. Bougault2, M. Bruno, T. Cap, G. Cardella, S. Cavallaro, M. B. Chatterjee, A. Chbihi3, M. Colonna, M. D'Agostino, R. Dayras4, M. Di Toro, J. Frankland3, E. Galichet1, W. Gawlikowicz, E. Geraci, A. Grzeszczuk, P. Guazzoni, S. Kowalski, E. La Guidara, G. Lanzalone, G. Lanzanò, N. Le Neindre2, I. Lombardo, C. Maiolino, M. Papa, E. Piasecki, S. Pirrone, R. Planeta, G. Politi, A. Pop, F. Porto, M. F. Rivet1, F. Rizzo, E. Rosato, K. Schmidt, K. Siwek-Wilczynska, I. Skwira-Chalot, A. Trifirò, M. Trimarchi, G. Verde, M. Vigilante, J. P. Wieleczko3, J. Wilczynski, L. Zetta, W. Zipper |
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| Laboratoire : |
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| équipe(s) de recherche : |
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Dynamique et thermodynamique nucléaire |
| Résumé : |
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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. |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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| Physical Review C (Phys. Rev. C) |
| Publisher |
American Physical Society |
| ISSN |
0556-2813 (eISSN : 1089-490X) |
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| Volume : |
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86 |
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| Page/Article : |
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014610 |
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| Identifiant local : |
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GANIL 2012-082 A |
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| Classification PACS : |
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25.70.Mn, 25.70.Pq |
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| Commentaire : |
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17 pages, 7 figures; The experiment was performed at the INFN-LNS Super-Conducting Cyclotron of Catania (Italy) |
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