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Nuclear matter
About: Nuclear matter is a research topic. Over the lifetime, 10180 publications have been published within this topic receiving 248261 citations.
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TL;DR: In this article, the chiral quark model was used to derive the coupling constants for the nucleon resonances up to 1700 MeV, including the N(1520) state.
Abstract: Recent heavy ion experiments indicate modifications of the $\rho-$meson mass in medium. In the CERES experiments $\rho-$mesons are produced at $\sim$ normal nuclear matter density, where hadrons are more appropriate constituents than quarks. A collective "nuclear $\rho$", in which every nucleon is excited to the N(1520) state, with equal amplitude, enters in this description. At the higher densities reached by future experiments constituent quarks become the appropriate variables. Here the $\rho$ and $\omega$ transition couplings to the nucleon resonances up to 1700 MeV, including the N(1520), are derived by means of the chiral quark model. The relevant coupling constants are expressed in terms of the corresponding vector coupling constants to nucleons. The quality of the model relations is tested by a calculation of the corresponding pion-resonance coupling constants, which are known from the empirical pion decay widths.
60 citations
TL;DR: In this article, the role of a scalar tetraquark state for the description of nuclear matter within the parity doublet model in the mirror assignment was investigated, and it was shown that this additional scalar degree of freedom affects non-negligibly the properties of the medium.
60 citations
TL;DR: In this paper, the phase diagram of the three-flavor polyakov-Nambu-Jona-Lasinio (PNJL) model was studied and the interplay between chiral symmetry restoration and deconfinement crossover was investigated.
Abstract: We study the phase diagram of the three flavor Polyakov-Nambu-Jona-Lasinio (PNJL) model and, in particular, the interplay between chiral symmetry restoration and deconfinement crossover. We compute chiral condensates, quark densities, and the Polyakov loop at several values of temperature and chemical potential. Moreover we investigate on the role of the Polyakov loop dynamics in the transition from nuclear matter to quark matter.
60 citations
TL;DR: Isotherms in a P-rho diagram are obtained which show the existence of a liquid-vapor phase equilibrium below a critical temperature of T/sub c/approx.
Abstract: Within the framework of the relativistic Dirac-Brueckner approach, the equation of state of nuclear matter is studied on the basis of a one-boson-exchange interaction. The saturation properties of the ground state and its compressional energy are calculated. The model is extended to nonzero temperature by use of finite-temperature Green's functions for the dressed nucleons. Isotherms in a $P\ensuremath{-}\ensuremath{\rho}$ diagram are obtained which show the existence of a liquid-vapor phase equilibrium below a critical temperature of ${T}_{c}\ensuremath{\simeq}12$ MeV.
60 citations
TL;DR: In this paper, the authors focus on central nuclear collisions in the energy range 20 −400 MeV/n and focus on the importance of medium mass fragment production for this goal.
60 citations