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Density dependencies of interaction strengths and their influences on nuclear matter and neutron stars in relativistic mean field theory
School of Physics, Peking University.
College of Physics and Technology, Wuhan University.
School of Physics, Peking University.
School of Physics, Peking University; College of Science, Southwest Jiaotong University.
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2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 4Article in journal (Refereed) Published
Abstract [en]

The density dependencies of various effective interaction strengths in the relativistic mean field are studied and carefully compared for nuclear matter and neutron stars. The influences of different density dependencies are presented and discussed on mean field potentials, saturation properties for nuclear matter, equations of state, maximum masses, and corresponding radii for neutron stars. Though the interaction strengths and the potentials given by various interactions are quite different in nuclear matter, the differences of saturation properties are subtle, except for NL2 and TM2, which are mainly used for light nuclei, while the properties by various interactions for pure neutron matter are quite different. To get an equation of state for neutron matter without any ambiguity, it is necessary to constrain the effective interactions either by microscopic many-body calculations for the neutron matter data or the data of nuclei with extreme isospin. For neutron stars, the interaction with large interaction strengths give strong potentials and large Oppenheimer-Volkoff (OV) mass limits. The density-dependent interactions DD-ME1 and TW-99 favor a large neutron population due to their weak rho-meson field at high densities. The OV mass limits calculated from different equations of state are 2.02-2.81M, and the corresponding radii are 10.78-13.27 km. After the inclusion of the hyperons, the corresponding values become 1.52-2.06M and 10.24-11.38 km.

Place, publisher, year, edition, pages
2004. Vol. 69, no 4
Keywords [en]
hartree-bogoliubov description, halo, energy
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-6051DOI: 10.1103/PhysRevC.69.045805ISI: 000221427500061OAI: oai:DiVA.org:kth-6051DiVA, id: diva2:10639
Note
QC 20100623Available from: 2006-08-17 Created: 2006-08-17 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Investigation of effective interactions in relativistic mean field theory
Open this publication in new window or tab >>Investigation of effective interactions in relativistic mean field theory
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. p. 83
Series
Trita-FYS, ISSN 0280-316X ; 2005:29
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-4074 (URN)91-7178-093-9 (ISBN)
Presentation
2005-07-07, , AlbaNova, Stockholm, 10:00
Note
QC 20101123Available from: 2006-08-17 Created: 2006-08-17 Last updated: 2010-11-23Bibliographically approved
2. Nuclear symmetry energy and neutron-proton pair correlations in microscopic mean field theory
Open this publication in new window or tab >>Nuclear symmetry energy and neutron-proton pair correlations in microscopic mean field theory
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

A major task of nuclear structure theory is to develop an effective interaction that is capable to predict properties of nuclei under extreme conditions. In this thesis three different areas of effective interactions have been studied: i) the density dependence, which is of importance for the understanding of neutron stars and neutron rich nuclei; ii) the symmetry energy which governs the evolution of the binding energy with changing N/Z ratio; and iii) the neutron proton pairing energy. The symmetry energy governs the isospin dependent part of the nuclear interaction and determines basic properties of neutron stars. The isospin dependence of short range correlations are in turn important for properties of N ~ Z nuclei as well as symmetric nuclear matter.

Place, publisher, year, edition, pages
Stockholm: Fysik, 2007
Series
Trita-FYS, ISSN 0280-316X ; 2007:70
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4469 (URN)978-91-7178-738-5 (ISBN)
Public defence
2007-08-24, Sal FA31, AlbaNova universitet centrum, Roslagstullsbacken 21, Stockholm, 11:00
Opponent
Supervisors
Note
QC 20100623Available from: 2007-08-20 Created: 2007-08-20 Last updated: 2010-07-15Bibliographically approved

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