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 testedfor several impact parameter estimators. Our main observations are (i) the yields of 1H and 3He particles in theneutron-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 samefor both systems, (iii) the N/Z ratio of intermediate mass fragments is correlated with the neutron richness of thesystem and is weakly dependent on the centrality of the collision, and (iv) the neutron richness of the detectedfragments increases strongly with decreasing rapidity in the range from that of the projectile-like fragment tothe c.m. region. The gross features of experimental data are reproduced by quantum molecular dynamics modelcalculations. A comparison between model calculations and the data indicates that the fragments produced in thec.m. regions are weakly excited.

Signatures of isospin effects were investigated for neutron-rich (Sn-124+Ni-64) and neutron-poor (Sn-112+Ni-58) 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 H-1 and He-3 particles in the neutron-poor system are strongly enhanced with respect to the neutron-rich system, and the yields of H-3, He-6, and Li-7,Li-8 are suppressed at all impact parameters, (ii) the yields of H-2, He-4, and Li-6 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.

Centrality dependence of isospin effect signatures in Sn124+Ni64 and Sn112+Ni58 reactions

GERACI, Elena Irene;PAGANO, ANGELO;POLITI, Giuseppe;RIZZO, Francesca;
2008

Abstract

Signatures of isospin effects were investigated for neutron-rich (Sn-124+Ni-64) and neutron-poor (Sn-112+Ni-58) 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 H-1 and He-3 particles in the neutron-poor system are strongly enhanced with respect to the neutron-rich system, and the yields of H-3, He-6, and Li-7,Li-8 are suppressed at all impact parameters, (ii) the yields of H-2, He-4, and Li-6 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.
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 testedfor several impact parameter estimators. Our main observations are (i) the yields of 1H and 3He particles in theneutron-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 samefor both systems, (iii) the N/Z ratio of intermediate mass fragments is correlated with the neutron richness of thesystem and is weakly dependent on the centrality of the collision, and (iv) the neutron richness of the detectedfragments increases strongly with decreasing rapidity in the range from that of the projectile-like fragment tothe c.m. region. The gross features of experimental data are reproduced by quantum molecular dynamics modelcalculations. A comparison between model calculations and the data indicates that the fragments produced in thec.m. regions are weakly excited.
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.
HEAVY-ION COLLISIONS; MOLECULAR DYNAMICS; ISOSPIN EFFECTS; IMPACT PARAMETER; EXPERIMENT
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/36715
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