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Abstract: In their ground states, atomic nuclei are quantum Fermi liquids. At finitetemperatures and low densities, these nuclei may undergo a phase change similarto, but substantially different from, a classical liquid gas phase transition.As in the classical case, temperature is the control parameter while densityand pressure are the conjugate variables. At variance with the classical case,in the nucleus the difference between the proton and neutron concentrationsacts as an additional order parameter, for which the symmetry potential is theconjugate variable. Different ratios of the neutron to proton concentrationslead to different critical points for the phase transition. This is analogousto the phase transitions occurring in $^{4}$He-$^{3}$He liquid mixtures. Wepresent experimental results which reveal the N-Z dependence of the phasetransition and discuss possible implications of these observations in terms ofthe Landau Free Energy description of critical phenomena.



Autor: A. Bonasera, Z. Chen, R. Wada, K. Hagel, J. Natowitz, P. Sahu, L. Qin, S. Kowalski, Th. Keutgen, T. Materna, T. Nakagawa

Fuente: https://arxiv.org/



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