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

Journal Article · Mon Nov 15 00:00:00 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, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevC.82.051603; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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