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 (7)Li and (7)Be, we have studied the diffusion of isospin asymmetry by combining data from asymmetric (112)Sn + (124)Sn and (124)Sn + (112)Sn collisions with those from symmetric (112)Sn + (112)Sn and (124)Sn + (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.
|Titolo:||Isospin diffusion and equilibration for Sn + Sn collisions at E/A = 35 MeV|
|Data di pubblicazione:||2010|
|Citazione:||Isospin diffusion and equilibration for Sn + Sn collisions at E/A = 35 MeV / Z. Y. SUN; M. B. TSANG; W. G. LYNCH; G. VERDE; F. AMORINI; L. ANDRONENKO; M. ANDRONENKO; G. CARDELLA; M. CHATTERJE; P. DANIELEWICZ; E. DE FILIPPO; P. DINH; E. GALICHET; E. GERACI; H. HUA; E. LA GUIDARA; G. LANZALONE; H. LIU; F. LU; S. LUKYANOV; C. MAIOLINO; A. PAGANO; S. PIANTELLI; M. PAPA; S. PIRRONE; G. POLITI; F. PORTO; F.RIZZO; P. RUSSOTTO; D. SANTONOCITO; Y. X. ZHANG. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 82(2010), pp. 051603/1-051603/4.|
|Appare nelle tipologie:||1.1 Articolo in rivista|