Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-02-23
Phys.Rev.C75:014601,2007
Physics
Nuclear Physics
Nuclear Experiment
9 pages, 7 figures. This is the version taking into account referee comments
Scientific paper
10.1103/PhysRevC.75.014601
Experimental analyses of moderate temperature nuclear gases produced in the violent collisions of 35 MeV/nucleon$^{64}$Zn projectiles with $^{92}$Mo and $^{197}$Au target nuclei reveal a large degree of alpha particle clustering at low densities. For these gases, temperature and density dependent symmetry energy coefficients have been derived from isoscaling analyses of the yields of nuclei with A $\leq 4$. At densities of 0.01 to 0.05 times the ground state density of symmetric nuclear matter, the temperature and density dependent symmetry energies are 10.7 to 13.5 MeV. These values are much larger than those obtained in mean field calculations. They are in quite good agreement with results of a recently proposed Virial Equation of State calculation.
Botvina A. S.
Chen Zai-Zhang
Cinausero M.
El Masri Y.
Fabris D.
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