Report
Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV
| العنوان: | 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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| المؤلفون: | 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., Zipper, W. |
| سنة النشر: | 2012 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | 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 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.86.014610 |
| URL الوصول: | http://arxiv.org/abs/1206.0697 |
| رقم الانضمام: | edsarx.1206.0697 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.86.014610 |
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