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Physical Review C 77 (2008) 014610
Centrality dependence of isospin effect signatures in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions
R. Planeta, F. Amorini, A. Anzalone, L. Auditore, V. Baran, A. Benisz, I. Berceanu, A. Bonasera, B. Borderie1, J. Borgensztajn, R. Bougault2, M. Bruno, J. Brzychczyk, G. Cardella, S. Cavallaro, M. B. Chatterjee, A. Chbihi3, M. Colonna3, M. D'Agostino, R. Dayras4, E. De Filippo, M. Di Toro, J. Frankland3, E. Galichet1, W. Gawlikowicz, E. Geraci, G. Giuliani, F. Giustolisi, A. Grzeszczuk, P. Guazzoni, D. Guinet5, S. Kowalski, M. Krauze, E. La Guidara, G. Lanzano, G. Lanzalone, N. Le Neindre1, J. Lukasik, C. Maiolino, Z. Majka, N.G. Nicolis, A. Pagano, M. Papa, M. Petrovici, E. Piasecki, S. Pirrone, G. Politi, A. Pop, F. Porto, M.F. Rivet1, E. Rosato, F. Rizzo, P. Russotto, K. Schmidt, K. Siwek-Wilczynska, I. Skwira-Chalot, A. Sochocka, L. Swiderski, A. Trifiro, M. Trimarchi, G. Vannini, M. Vigilanti, J.P. Wieleczko3, J. Wilczynski, L. Zetta, W. Zipper
ISOSPIN Collaboration(s)

Signatures of isospin effects were investigated for neutron-rich (124Sn+64Ni) and neutron-poor (112Sn+58Ni) systems at 35 MeV/nucleon for noncentral collisions. The centrality dependence of these signatures was tested for several impact parameter estimators. Our main observations are (i) the yields of 1H and 3He particles in the neutron-poor system are strongly enhanced with respect to the neutron-rich system, and the yields of 3H, 6He, and 7,8Li are suppressed at all impact parameters, (ii) the yields of 2H, 4He, and 6Li particles are almost the same for both systems, (iii) the N/Z ratio of intermediate mass fragments is correlated with the neutron richness of the system and is weakly dependent on the centrality of the collision, and (iv) the neutron richness of the detected fragments increases strongly with decreasing rapidity in the range from that of the projectile-like fragment to the c.m. region. The gross features of experimental data are reproduced by quantum molecular dynamics model calculations. A comparison between model calculations and the data indicates that the fragments produced in the c.m. regions are weakly excited.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  SPhN - Service de Physique Nucléaire
5 :  IPNL - Institut de Physique Nucléaire de Lyon
Dynamique et thermodynamique nucléaire
Physique/Physique Nucléaire Expérimentale