Symmetry Energy in Nuclear Surface

Interplay between the dependence of symmetry energy on density and the variation of nucleonic densities across nuclear surface is discussed. That interplay gives rise to the mass dependence of the symmetry coefficient in an energy formula. Charge symmetry of the nuclear interactions allows to introduce isoscalar and isovector densities that are approximately independent of the magnitude of neutron-proton asymmetry.Comment: 8 pages, 4 figures, contribution to 15th Nuclear Physics Workshop "Marie & Pierre Curie", Kazimierz, Poland, 2008; minor correction

Symmetry Energy

Examination of symmetry energy is carried out on the basis of an elementary binding-energy formula. Constraints are obtained on the energy value at the normal nuclear density and on the density dependence of the energy at subnormal densities.Comment: 10 pages, 6 figures; talk given at the 3rd Argonne/MSU/INT/JINA RIA Theory Workshop, Argonne, April 4-7, 200

Flow and the equation of state of nuclear matter

The status of flow in heavy-ion collisions and of inference of hadronic-matter properties is reviewed.Comment: 16 pages, 21 figures, talk given at the 7th Int. Conf. on Nucleus-Nucleus Collisions, NN2000, Strasbourg, France, July 3-7, 200

Flow and equation of state in heavy-ion collisions

The status of flow in heavy-ion collisions and of inference of hadronic-matter properties is reviewed.Comment: 11 pages, 12 figures, talk given at Quark Matter '99, Torino, Ital

Thermodynamics of Delta resonances

The thermodynamic potential of a system of pions and nucleons is computed including the piN interactions in the P33 channel. A consistent treatment of the width of the resonance in this channel, the Delta(1232) resonance, is explored in detail. In the low-density limit we recover the leading term of the virial expansion for the thermodynamic potential. An instructive diagrammatic interpretation of the contributions to the total baryon number is presented. Furthermore, we examine within a fireball model the consequences for the pion spectra in heavy-ion collisions at intermediate energies, including the effect of collective flow. A consistent treatment of the Delta width leads to a substantial enhancement of the pion yield at low momenta.Comment: 12 pages, 3 Postscript figures, LaTeX, elsart, epsfig, minor changes, references added, to be published in Physics Letters