The Nuclear Matter Symmetry Energy at 0.03≤ ρ/ρ₀≤ 0.2
Wada, R. · Hagel, K. · Qin, L. · Natowitz, J. B. · Röpke, G. · Shlomo, S. · Bonasera, A. · Typel, S. · Chen, Z. · Huang, M. · Wang, J. · Zheng, H. · Kowalski, S. · Bottosso, C. · Barbui, M. · Rodrigues, M. R. D. · Schmidt, K. · 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.
Original · EN
Measurements of the density dependence of the free symmetry energy in low density clustered matter have been extended using the NIMROD multi-detector at Texas A&M University. Thermal coalescence models were employed to extract densities, ρ, and temperatures, T, for evolving systems formed in collisions of 47 A MeV ⁴⁰Ar + ¹¹²Sn,¹²⁴Sn and ⁶⁴Zn + ¹¹²Sn, ¹²⁴Sn. Densities of 0.03 ≤ ρ/ρ₀ ≤ 0.2 and temperatures in the range 5 to 10 MeV have been sampled. The free symmetry energy coefficients are found to be in good agreement with values calculated using a quantum statistical model. Values of the corresponding symmetry energy coefficient are derived from the data using entropies derived from the model.
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