Properties Of Dense Nuclear Matter Research Articles

Influence of Relativistic Finite Volume Effect of Nucleons on the Dense Matter Properties

The influence of the relativistic finite volume effect of nucleons on the properties of dense nuclear matter is examined at finite temperature and it is found that the abnormal nuclear state can appear at sufficiently high density. Then, by using this methed the phase transition between hadronic matter and quark-gluon plasma is studied. The numerical results show that the value of nucleon radius is important for reproducing this phase transition correctly.

Radial flow of kaon mesons in heavy ion reactions

This work investigates the collective motion of kaons in heavy ion reactions at SIS energies (about 1--2 GeV/nucleon). A radial collective flow of ${K}^{+}$ mesons is predicted to exist in central Au + Au collisions, which manifests in a characteristic ``shoulder-arm'' shape of the transverse mass spectrum of the midrapidity ${K}^{+}$ mesons. The ${K}^{+}$ radial flow arises from the repulsive ${K}^{+}$ mean field in nuclear matter. In spite of a strong reabsorption and rescattering the attractive ${K}^{\ensuremath{-}}$ mean field leads as well to a collective radial flow of ${K}^{\ensuremath{-}}$ mesons. The ${K}^{\ensuremath{-}}$ radial flow, however, is different from that of ${K}^{+}$ mesons and can be observed by a characteristic ``concave'' structure of the transverse mass spectrum of the ${K}^{\ensuremath{-}}$ mesons emitted at midrapidity. The kaon radial flows can therefore serve as a novel tool for the investigation of kaon properties in dense nuclear matter.

Variations of hadron masses and matter properties in dense nuclear matter.

Using a self-consistent quark model for nuclear matter we investigate variations of the masses of the nonstrange vector mesons, the hyperons, and the nucleon in dense nuclear matter (up to four times the normal nuclear density). We find that the changes in the hadron masses can be described in terms of the value of the scalar mean field in matter. The model is then used to calculate the density dependence of the quark condensate in-medium, which turns out to be well approximated by a linear function of the nuclear density. Some relations among the hadron properties and the in-medium quark condensate are discussed.

Pion production, pion absorption, and nucleon properties in dense nuclear matter: Relativistic Dirac-Brueckner approach at intermediate and high energies.

Within the relativistic Dirac-Brueckner approach we discuss the properties of highly-energetic nucleons and deltas in dense nuclear matter. The effective NN and N..delta.. interactions are constructed in a fully self-consistent way and reproduce all known properties of nuclear matter. We calculate the nucleon self-energy and the density-dependent effective NN and N..delta.. cross sections in a nuclear medium. Results show a sizable reduction of the ..delta.. (pion) production cross section and important changes in the ..delta.. absorption cross sections.