HAL : in2p3-00213448, version 1
 Physical Review C 77 (2008) 014610
 Centrality dependence of isospin effect signatures in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions
 ISOSPIN Collaboration(s)
 (2008)
 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.
 équipe(s) de recherche : Dynamique et thermodynamique nucléaire
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 in2p3-00213448, version 1 http://hal.in2p3.fr/in2p3-00213448 oai:hal.in2p3.fr:in2p3-00213448 Contributeur : Dominique Girod <> Soumis le : Mercredi 23 Janvier 2008, 10:58:24 Dernière modification le : Mercredi 23 Janvier 2008, 13:46:44