Spinodal in asymmetric nuclear matter

J. Margueron (1) , P. Chomaz (1)

1 GANIL - Grand Accélérateur National d'Ions Lourds

The phase diagram of nuclear matter is quite rich - it shows suchphenomena as phase-transitions, formation of condensates, clustering, etc.From the analysis of the spinodal instability, one can learn about the region ofliquid-gas coexistence in nuclear matter at low densitiesand finite isospin asymmetries. In a recent paper, we have shownthat asymmetric nuclear matter at sub-nuclear densities shouldundergo only one type of instability.The associated order parameter is dominated by the isoscalar density and sothe transition is of liquid-gas type. The instability goes in the directionof a restoration of the isospin symmetry leading to a fractionationphenomenon.

Mots clés: Spinodal instability; Skyrme and Gogny Effective Interaction; Asymmetric Nuclear Matter

Domaines: Physique Nucléaire Théorique [nucl-th]

J. Margueron, P. Chomaz. Spinodal in asymmetric nuclear matter. Ricerca Scientifica ed Educazione Permanente Supplemento, 2003, 120, pp.82-90. ⟨hal-00000316⟩