Isospin diffusion and equilibration for Sn+Sn collisions at E/A=35 MeV

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.051603· OSTI ID:21499153

Sun, Z Y ^[1]; Tsang, M B; Lynch, W G; Danielewicz, P ^[1]; Verde, G; Cardella, G; De Filippo, E; Pagano, A; Papa, M; Pirrone, S ^[2]; Amorini, F; Porto, F; Rizzo, F; Russotto, P ^[3]; Andronenko, L; Andronenko, M ^[1]; Chatterje, M; Galichet, E; Maiolino, C; Santonocito, D ^[3]

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1. National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
2. INFN, Sezione di Catania (Italy)
3. INFN, Laboratori Nazionali del Sud, Catania (Italy)

Equilibration and equilibration rates have been measured by colliding Sn nuclei with different isospin asymmetries at beam energies of E/A=35 MeV. Using the yields of mirror nuclei of {sup 7}Li and {sup 7}Be, we have studied the diffusion of isospin asymmetry by combining data from asymmetric {sup 112}Sn+{sup 124}Sn and {sup 124}Sn+{sup 112}Sn collisions with those from symmetric {sup 112}Sn+{sup 112}Sn and {sup 124}Sn+{sup 124}Sn collisions. We use these measurements to probe isospin equilibration in central collisions where nucleon-nucleon collisions are strongly blocked by the Pauli exclusion principle. The results are consistent with transport theoretical calculations that predict a degree of transparency in these collisions, but inconsistent with the emission of intermediate mass fragments by a single chemically equilibrated source. Comparisons with quantum molecular dynamics calculations are consistent with results obtained at higher incident energies that provide constraints on the density dependence of the symmetry energy.

• OSTI ID: 21499153
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ASYMMETRY
BARYON-BARYON INTERACTIONS
BERYLLIUM 7
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
CALCULATION METHODS
COLLISIONS
COMPARATIVE EVALUATIONS
DAYS LIVING RADIOISOTOPES
DENSITY
DIFFUSION
ELECTRON CAPTURE RADIOISOTOPES
EMISSION
ENERGY RANGE
EVALUATION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON-HADRON INTERACTIONS
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOSPIN
ISOTOPES
LIGHT NUCLEI
LITHIUM 7
LITHIUM ISOTOPES
MASS
MEV RANGE
MEV RANGE 10-100
MIRROR NUCLEI
MOLECULAR DYNAMICS METHOD
NUCLEI
NUCLEON-NUCLEON INTERACTIONS
ODD-EVEN NUCLEI
OPACITY
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PAULI PRINCIPLE
PHYSICAL PROPERTIES
RADIOISOTOPES
STABLE ISOTOPES
SYMMETRY
TIN 112
TIN 124
TIN ISOTOPES