Experimental determination of the symmetry energy of a low density nuclear gas
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Experimental analyses of moderate-temperature nuclear gases produced in the violent collisions of 35 MeV/nucleon Zn64 projectiles with Mo92 and Au197 target nuclei reveal a large degree of 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 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 range from 9.03 to 13.6 MeV. This is much larger than those obtained in mean-field calculations and reflects the clusterization of low-density nuclear matter. The results are in quite reasonable agreement with calculated values obtained with a recently proposed virial equation of state calculation. 2007 The American Physical Society.
author list (cited authors)
Kowalski, S., Natowitz, J. B., Shlomo, S., Wada, R., Hagel, K., Wang, J., ... Ono, A.
complete list of authors
Kowalski, S||Natowitz, JB||Shlomo, S||Wada, R||Hagel, K||Wang, J||Materna, T||Chen, Z||Ma, YG||Qin, L||Botvina, AS||Fabris, D||Lunardon, M||Moretto, S||Nebbia, G||Pesente, S||Rizzi, V||Viesti, G||Cinausero, M||Prete, G||Keutgen, T||Masri, Y El||Majka, Z||Ono, A