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

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Kowalski, S. Natowitz, J. B. Shlomo, S. Wada, R. Hagel, K. Keutgen, Thomas [UCL] El Masri, Youssef [UCL] Ono, A.

Experimental analyses of moderate-temperature nuclear gases produced in the violent collisions of 35 MeV/nucleon Zn-64 projectiles with Mo-92 and Au-197 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 <= 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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2007
Language Anglais
Journal information "Physical Review C (Nuclear Physics)" - Vol. 75, no. 1 (2007)
Peer reviewed yes
Publisher American Physical Soc (College Pk)
issn 0556-2813
e-issn 1089-490X
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
Links
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Bibliographic reference Kowalski, S. ; Natowitz, J. B. ; Shlomo, S. ; Wada, R. ; Hagel, K. ; et. al. Experimental determination of the symmetry energy of a low density nuclear gas. In: Physical Review C (Nuclear Physics), Vol. 75, no. 1 (2007)
Permanent URL http://hdl.handle.net/2078.1/37778