Isospin Diffusion and Equilibration for Sn+Sn collisions at E/A=35 MeV
Abstract
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 7Li and 7Be, we have studied the diffusion of isospin asymmetry by combining data from asymmetric 112Sn+124Sn and 124Sn+112Sn collisions with that from symmetric 112Sn+112Sn and 124Sn+124Sn collisions. We use these measurements to probe isospin equilibration in central collisions where nucleon-nucleon collisions are strongly blocked by the Pauli exclusion principal. 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 ImQMD calculations are consistent with results obtained at higher incident energies that provide constraints on the density dependence of the symmetry energy.
Cite
@article{arxiv.1009.1669,
title = {Isospin Diffusion and Equilibration for Sn+Sn collisions at E/A=35 MeV},
author = {Z. Y. Sun and M. B. Tsang and W. G. Lynch and G. Verde and F. Amorini and L. Andronenko and M. Andronenko and G. Cardella and M. Chatterje and P. Danielewicz and E. De Filippo and P. Dinh and E. Galichet and E. Geraci and H. Hua and E. La Guidara and G. Lanzalone and H. Liu and F. Lu and S. Lukyanov and C. Maiolino and A. Pagano and S. Piantelli and M. Papa and S. Pirrone and G. Politi and F. Porto and F. Rizzo and P. Russotto and D. Santonocito and Y. X. Zhang},
journal= {arXiv preprint arXiv:1009.1669},
year = {2010}
}
Comments
13 pages, 3 figures, submitted to PRC Rapid Communications