Centrality dependence of isospin effect signatures in {sup 124}Sn+{sup 64}Ni and {sup 112}Sn+{sup 58}Ni reactions

Journal Article · Tue Jan 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.014610· OSTI ID:21068060

Planeta, R; Brzychczyk, J; Majka, Z; Sochocka, A ^[1]; Amorini, F; Cavallaro, S; Toro, M Di; Giustolisi, F; Lanzalone, G ^[2]; Anzalone, A; Bonasera, A; Colonna, M; Maiolino, C; Porto, F; Rizzo, F; Russotto, P ^[2]; Auditore, L; Trifiro, A; Trimarchi, M ^[3]; Baran, V ^[4]

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1. M. Smoluchowski Institute of Physics, Jagiellonian University, Cracow (Poland)
2. INFN, Laboratori Nazionali del Sud, Catania (Italy)
3. INFN, Gruppo Collegato di Messina and Dipartamento di Fisica, Universit di Messina (Italy)
4. Horia Hulubei National Institute of Physiscs and Nuclear Engineering, Bucharest (Romania)

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

• OSTI ID: 21068060
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPARATIVE EVALUATIONS
HELIUM 3
HELIUM 4
HELIUM 6
HYDROGEN 1
IMPACT PARAMETER
ISOSPIN
LITHIUM 6
LITHIUM 8
MOLECULAR DYNAMICS METHOD
NEUTRONS
NICKEL 58 TARGET
NICKEL 64 TARGET
NUCLEAR FRAGMENTATION
NUCLEAR FRAGMENTS
NUCLEAR REACTION YIELD
PARTICLE RAPIDITY
TIN 112 REACTIONS
TIN 124 REACTIONS