Effective interaction: From nuclear reactions to neutron stars

Abstract

An equation of state (EoS) for symmetric nuclear matter is constructed using the density dependent M3Y effective interaction and extended for isospin asymmetric nuclear matter. Theoretically obtained values of symmetric nuclear matter incompressibility, isobaric incompressibility, symmetry energy and its slope agree well with experimentally extracted values. Folded microscopic potentials using this effective interaction, whose density dependence is determined from nuclear matter calculations, provide excellent descriptions for proton, alpha and cluster radioactivities, elastic and inelastic scattering. The nuclear deformation parameters extracted from inelastic scattering of protons agree well with other available results. The high density behavior of symmetric and asymmetric nuclear matter satisfies the constraints from the observed flow data of heavy-ion collisions. The neutron star properties studied using β-equilibrated neutron star matter obtained from this effective interaction reconcile with the recent observations of the massive compact stars.

Probing isospin- and momentum-dependent nuclear effective interactions in neutron-rich matter

“…In the effective-field theory (EFT) approach [20,21,22], effective nuclear interactions are constructed from low energy QCD and its symmetry breaking, and thus they usually have a smaller number of free parameters and a correspondingly higher predictive power. In the phenomenological approach [23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41], the nuclear many-body problem is generally treated using effective density-(momentum-and isospin-) dependent nuclear forces or effective interaction Lagrangians with parameters adjusted to fit the properties of a number of finite nuclei and/or nuclear scattering data. Although a lot of useful information on the in-medium nuclear effective interactions around normal nuclear density with relatively small isospin asymmetry has been obtained by analyzing experimental data based on these various approaches, corresponding knowledge at high baryon density and/or large isospin asymmetry remains very limited.…”