Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Guichon, P.A.M.; Stone, J. R.; Thomas, A. W.

doi:10.1016/j.ppnp.2018.01.008

Cited by 75 publications

(103 citation statements)

References 149 publications

(289 reference statements)

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“…Within the quark-meson coupling model (QMC) (Guichon (1988); Guichon et al (1996); Saito et al (2007); Guichon et al (2018)) NS with masses of order 1.9 M are produced with or without the inclusion of hyperons in the EOS (Rikovska- Stone et al (2007); Stone et al (2010); Whittenbury et al (2014Whittenbury et al ( , 2016). This remarkable feature, first published three years before the first heavy NS measurement (Demorest et al (2010)), is a consequence of the fact that the self-consistent modification of the internal quark structure of hadrons inmedium naturally leads to repulsive three-body forces between all baryons -see Refs.…”

Section: Introductionmentioning

confidence: 99%

“…This remarkable feature, first published three years before the first heavy NS measurement (Demorest et al (2010)), is a consequence of the fact that the self-consistent modification of the internal quark structure of hadrons inmedium naturally leads to repulsive three-body forces between all baryons -see Refs. Guichon and Thomas (2004); Guichon et al (2018). Furthermore, these forces involve no new parameters but are a direct consequence of the underlying quark structure, through the so-called scalar polarizabilities.…”

Section: Introductionmentioning

confidence: 99%

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Isovector Effects in Neutron Stars, Radii, and the GW170817 Constraint

Motta

Kalaitzis

Antić

et al. 2019

ApJ

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An isovector-scalar meson is incorporated self-consistently into the quark-meson coupling description of nuclear matter and its most prominent effects on the structure of neutron stars are investigated. The recent measurement of GW170817 is used to constrain the strength of the isovector-scalar channel. With the imminent measurements of the neutron star radii in the NICER mission it is particularly notable that the inclusion of the isovector-scalar force has a significant impact. Indeed, the effect of this interaction on the neutron star radii and masses is larger than the uncertainties introduced by variations in the parameters of symmetric nuclear matter at saturation, namely the density, binding energy per nucleon and the symmetry energy. In addition, since the analysis of GW170817 has provided constraints on the binary tidal deformability of merging neutron stars, the predictions for this parameter within the quark-meson coupling model are explored, as well as the moment of inertia and the quadrupole moment of slowly rotating neutron stars.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isovector Effects in Neutron Stars, Radii, and the GW170817 Constraint

Motta

Kalaitzis

Antić

et al. 2019

ApJ

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“…The full derivation of the EDF can be found in the recent review [11]. Here we outline only the main features of the model.…”

Section: A the Qmcπ-ii Edfmentioning

confidence: 99%

Parameter optimization for the latest quark-meson coupling energy-density functional

et al. 2019

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The Quark-Meson-Coupling (QMC) model self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter. It offers a natural explanation to some open questions in nuclear theory, including the origin of many-body nuclear forces and their saturation, the spin-orbit interaction and properties of hadronic matter at a wide range of densities. The QMC energy density functionals QMC-I and QMCπ-I have been successfully applied to calculate ground state observables of finite nuclei in the Hartree-Fock + BCS approximation, as well as to predict properties of dense nuclear matter and cold non-rotating neutron stars. Here we report the latest development of the model, QMCπ-II, extended to include higher order self-interaction of the σ meson. A derivative-free optimization algorithm has been employed to determine a new set of the model parameters and their statistics, including errors and correlations. QMCπ-II predictions for a wide range of properties of even-even nuclei across the nuclear chart, with fewer adjustable parameters, are comparable with other models. Predictions of ground state binding energies of even-even isotopes of superheavy elements with Z>96 are particularly encouraging.

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“…The effective QMC EDF has a different density dependence than the frequently used Skyrme or Gogny EDF [41,47] but is used in the same Hartree-Fock + BCS approximation technique. As compared to the more traditional EDF, the QMC EDF has fewer parameters which are well constrained within physically justified limits [41].…”

Section: Discussionmentioning

confidence: 99%

“…The results presented here include binding energies E b , deformation parameters β 2 , twoneutron separation energies S 2n , Q α values, empirical shell gap parameter δ 2n and singleparticle spectra, calculated in the self-consistent, mean-field Hartree-Fock (HF) approximation with a BCS pairing model. A full description of the model can be found in [41] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Physics of even-even superheavy nuclei with 96<Z<110 in the quark-meson-coupling model

et al. 2019

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The Quark-Meson-Coupling (QMC) model has been applied to the study of the properties of even-even superheavy nuclei with 96 ≤ Z ≤ 110, over a wide range of neutron numbers. The aim is to identify the deformed shell gaps at N=152 and N=162 predicted in macroscopic-microscopic (macro-micro) models, in a model based on the mean-field Hartree-Fock+BCS approximation.The predictive power of the model has been tested on proton and neutron spherical shell gaps in light doubly closed (sub)shell nuclei 40 Ca, 48 Ca, 56 Ni, 56 Ni , 78 Ni , 90 Zr, 100 Sn , 132 Sn, 146 Gd and 208 Pb, with results in a full agreement with experiment.In the superheavy region, the ground state binding energies of 98 ≤ Z ≤ 110 and 146 ≤ N ≤ 160 differ, in the majority of cases, from the measured values by less than ±2.5 MeV, with the deviation decreasing with increasing Z and N. The axial quadrupole deformation parameter, β 2 , calculated over the range of neutron numbers 138 ≤ N ≤ 184, revealed a prolate-oblate coexistence and shape transition around N=168, followed by an oblate-spherical transition towards the expected N=184 shell closure in Cm, Cf, Fm and No. The closure is not predicted in Rf, Sg, Hs and Ds as another shape transition to a highly deformed (β 2 ∼ 0.4) shape in Sg, Hs and Ds for N> 178 appears, while 288 Rf (N=184) remains oblate. The bulk properties predicted by QMC, such as ground state binding energy, two-neutron separation energy, the empirical shell-gap parameter δ 2n and Q α values, are found to have a limited sensitivity to the deformed shell gaps at N=152 and 162. However, the evolution of the neutron single-particle spectra with 0 ≤ β 2 ≤ 0.55 of 244 Cm, 248 Cf, 252 Fm, 256 No, 260 Rf, 264 Sg, 268 Hs and 272 Ds, as representative examples, gives a (model dependent) evidence for the location and size of the N=152 and 162 gaps as a function of Z and N. In addition, the neutron number dependence of neutron pairing energies provides supporting indication for existence of the energy gaps.Based on these results, the mean-field QMC and macro-micro models and their predictions of deformed shell structure of superheavy nuclei are compared. Clearly the QMC model does not give results as close to the experiment as the macro-micro models. However, considering that it has only four global variable parameters (plus two parameters of the pairing potential), with no local adjustments, the results are promising.

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Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Cited by 75 publications

References 149 publications

Isovector Effects in Neutron Stars, Radii, and the GW170817 Constraint

Isovector Effects in Neutron Stars, Radii, and the GW170817 Constraint

Parameter optimization for the latest quark-meson coupling energy-density functional

Physics of even-even superheavy nuclei with 96<Z<110 in the quark-meson-coupling model

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