Experimental determination of the symmetry energy of a low density nuclear gas

S. Kowalski, J. B. Natowitz, S. Shlomo, R. Wada, K. Hagel, J. Wang, T. Materna, Z. Chen, Y. G. Ma, L. Qin, A. S. Botvina, D. Fabris, M. Lunardon, S. Moretto, G. Nebbia, S. Pesente, V. Rizzi, G. Viesti, M. Cinausero, G. PreteT. Keutgen, Y. El Masri, Z. Majka, A. Ono

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117 Citations (Scopus)

Abstract

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 α 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.

Original languageEnglish
Article number014601
JournalPhysical Review C - Nuclear Physics
Volume75
Issue number1
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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