Year: 2007
Type: article
Abstract: Asymmetric nuclear matter is investigated in the low-density region below the nuclear saturation density. Microscopic calculations based on the Dirac-Brueckner-Hartree-Fock (DBHF) approach with realistic nucleon-nucleon potentials are used to adjust a low-density functional. This functional is constructed on a density expansion of the relativistic mean-field theory that allows a clear interpretation of the role of the mesons in the equation of state. It is shown that a correction term should be added to the functional to take into account the effects beyond the mean field. Two functionals with different corrections are obtained and their topological properties have been studied. Those functionals converge to predict a reduction of the spinodal zone in asymmetric nuclear matter by about 15--20% and an isoscalar unstable mode closer to the constant $Z/A$ direction than the functional without correction.
Source: Physical Review C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2094319910