Journal
PHYSICAL REVIEW C
Volume 82, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.82.051603
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Funding
- US National Science Foundation [INT-0218329, PHY 060007, 0800026]
- High Performance Computing Center (HPCC) at Michigan State University
- Texas Advanced Computing Center, University of Texas
- Chinese National Science Foundation [10675172, 10979023, 10175093, 10235030]
- Direct For Mathematical & Physical Scien
- Division Of Physics [800026] Funding Source: National Science Foundation
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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 Li-7 and Be-7, we have studied the diffusion of isospin asymmetry by combining data from asymmetric Sn-112 + Sn-124 and Sn-124 + Sn-112 collisions with those from symmetric Sn-112 + Sn-112 and Sn-124 + Sn-124 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.
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