I. Lovas

Quark-gluon plasma radiography by mesons with hidden favour

Measurement of the ratio of the Phi and J/ Psi mesons as a function of multiplicity is proposed as a tool to observe quark-gluon plasma formation in relativistic heavy-ion collisions. The effect of the hadronic absorption on this ratio is analysed.

Gluon-condensation of quark-gluon plasma in mean field approximation

Abstract Starting from the field equations of QCD and applying the mean field approximation, a self-consistent set of equations is derived for the description of the gluon-condensed state of quark-gluon plasma. A solution of these equations has been found, which corresponds to a static, chromo-magnetic field, periodic in space. This field induces self-consistently a periodic oscillation of the spin-color density of the quarks.

The ratio of the φ and J Ψ meson yields in heavy ion collisions

Abstract It is suggested that the formation of a quark-gluon plasma in relativistic heavy-ion collisions may reveal itself in the azimuthal asymmetry of the ratio of the GF and J Ψ meson yields which can be measured using RICH-type detectors.

Generalized Rarita-Schwinger Equations for Non-Strange Baryons

The Rarita-Schwinger equations are generalized for particles having isospin. These equations provide a framework for the description of the non-strange baryons. The nucleon and delta fields are coupled. Their degeneracy can be resolved.

Periodic spin density in nuclear matter

A phase transition of nuclear matter into a periodic phase has been found. Studying the spin density we have detected a periodic structure. The nucleon spin orientation follows the direction of the magnetic field associated with the periodic vector meson field.

The effect of pion condensation on superfluidity in neutron stars

The authors study the effect of pion condensation on the energy gap of superfluid neutron matter. The neutron energy spectrum is determined in a Walecka-type model in the mean-field approximation. This spectrum is inserted into the BCS model to calculate the energy gap for singlet pairing superfluid neutron matter. With this procedure they calculate the energy gap for pion condensed and normal matter at various densities. It turns out that in the superfluid density region the pion condensation is too weak to modify the energy gap significantly.

Dirac particle in a periodic field II

The properties of nuclear matter are studied. Assuming an ω-meson field, periodic in space, a self-consistent set of equations is derived in mean field approximation for the description of nucleons interacting via σ-meson and ω-meson fields.In the presence of such an ω field the energy spectrum of the relativistic nucleons exhibits allowed and forbidden bands similar to the energy spectrum of the electrons in solids.

Nuclear force with an ultra short range attraction

The authors propose an ultra short range attraction in the nucleon-nucleon potential to imitate some qualitative features of the quark model. A modified version of the Reid soft core potential is presented. It is proved to be capable of describing the physical observables of the deuteron as well as the original Reid soft core potential. The probability of the six-quark configuration of the two-nucleon system can be defined and a good estimate for this probability can be obtained.

Nucleon-nucleon interaction with ultra short range attraction

A nucleon-nucleon interaction with ultra short range attraction is introduced. The attractive regions are separated by a narrow, very high repulsive barrier. To find the paramenters of this kind of potential, some properties of the two-nucleon system are calculated. The aim is to decrease the gap between the traditional nuclear physics and the quark model.

A search for giant resonances by inelastic proton scattering on24Mg

A straightforward method is proposed for the observation of giant resonances based on the phase shift analysis of the inelastic transition between a 0+ ground state and a weakly excited 0+ state. The method is tested by analysing the differential cross section of inelastic proton scattering leading to the 0+ (Eex=6.43 MeV) excited state of24Mg.