M. Hjorth-Jensen

Realistic effective interactions for nuclear systems

Abstract A review of perturbative many-body descriptions of several nuclear systems is presented in this report. Examples of systems considered are symmetric and asymmetric nuclear matter and finite nuclei with few valence particles. Our many-body description starts with the most recent meson-exchange potential models for the nucleon-nucleon interaction, an interaction which in turn is used in our perturbative schemes to evaluate the effective interaction for finite nuclei and infinite nuclear matter. A unified perturbative approach based on time-dependent perturbation theory is elaborated. For finite nuclei we present new results for the effective interaction and the energy spectra in the mass areas of oxygen, calcium and tin.

PHASES OF DENSE MATTER IN NEUTRON STARS

Abstract Recent equations of state for dense nuclear matter are discussed with possible phase transitions arising in neutron stars such as pion, kaon and hyperon condensation, superfluidity and quark matter. Specifically, we treat the nuclear to quark matter phase transition, the possible mixed phase and its structure. A number of numerical calculations of rotating neutron stars with and without phase transitions are given and compared to observed masses, radii, temperatures and glitches.

Novel features of nuclear forces and shell evolution in exotic nuclei

Novel simple properties of the monopole component of effective nucleon-nucleon interactions are presented, leading to the so-called monopole-based universal interaction. Shell structures are shown to change as functions of N and Z, consistent with experiments. Some key cases of this shell evolution are discussed, clarifying the effects of central and tensor forces. The validity of the present tensor force is examined in terms of the low-momentum interaction V(lowk) and the Q(box) formalism.

Hyperon-hyperon interactions and properties of neutron star matter

We present results from Brueckner-Hartree-Fock calculations for

Coupled Cluster Calculations of Ground and Excited States of Nuclei

\ensuremath{\beta}

Continuum Effects and Three-Nucleon Forces in Neutron-Rich Oxygen Isotopes

-stable neutron star matter with nucleonic and hyperonic degrees of freedom, employing the most recent parametrizations of the baryon-baryon interaction of the Nijmegen group. It is found that the only strange baryons emerging in

Medium-mass nuclei from chiral nucleon-nucleon interactions.

\ensuremath{\beta}

3 P 2 − 3 F 2 pairing in neutron matter with modern nucleon-nucleon potentials

-stable matter up to total baryonic densities of 1.2

ASYMMETRIC NUCLEAR MATTER AND NEUTRON STAR PROPERTIES

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Critical temperature for quenching of pair correlations

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