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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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Journal ArticleDOI
TL;DR: The polarization contributions to second order in the low-momentum interaction V(low k) are computed and it is found that the medium-induced spin-orbit interaction leads to a reduction of the 3P2 pairing gap for neutrons in the interior of neutron stars.
Abstract: We calculate the modification of the effective interaction of particles on the Fermi surface due to polarization contributions, with particular attention to spin-dependent forces. In addition to the standard spin-spin, tensor, and spin-orbit forces, spin nonconserving effective interactions are induced by screening in the particle-hole channels. Furthermore, a novel long-wavelength tensor force is generated. We compute the polarization contributions to second order in the low-momentum interaction V l o w k and find that the medium-induced spin-orbit interaction leads to a reduction of the 3 P 2 pairing gap for neutrons in the interior of neutron stars.

130 citations

Journal ArticleDOI
TL;DR: In this paper, a set of equation of state (EOS) of nuclear matter including hyperons using an SUf(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature and charge fraction for numerical simulations of core-collapse supernovae is presented.
Abstract: We present sets of equation of state (EOS) of nuclear matter including hyperons using an SUf(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature and charge fraction for numerical simulations of core-collapse supernovae. Coupling constants of ? and ? hyperons with the ? meson are determined to fit the hyperon potential depths in nuclear matter, U?(?0) +30 MeV and U?(?0) ?15 MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al, in which the formation of finite nuclei is included in the Thomas?Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17 M? (Ne?) to 1.63 M? (NYe?) when hyperons are included. In a spherical, adiabatic collapse of a 15 M? star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40 MeV or ?B > 0.4 fm?3).

130 citations

Journal ArticleDOI
TL;DR: In this article, the authors explore the impact of nuclear matter saturation on the properties and systematics of finite nuclei across the nuclear chart using the ab initio in-medium similarity renormalization group (IM-SRG).
Abstract: We explore the impact of nuclear matter saturation on the properties and systematics of finite nuclei across the nuclear chart. By using the ab initio in-medium similarity renormalization group (IM-SRG), we study ground-state energies and charge radii of closed-shell nuclei from $^{4}\mathrm{He}$ to $^{78}\mathrm{Ni}$ based on a set of low-resolution two- and three-nucleon interactions that predict realistic saturation properties. We first investigate in detail the convergence properties of these Hamiltonians with respect to model-space truncations for both two- and three-body interactions. We find one particular interaction that reproduces well the ground-state energies of all closed-shell nuclei studied. As expected from their saturation points relative to this interaction, the other Hamiltonians underbind nuclei but lead to a remarkably similar systematics of ground-state energies. Extending our calculations to complete isotopic chains in the $sd$ and $pf$ shells with the valence-space IM-SRG, the same interaction reproduces not only experimental ground states but two-neutron-separation energies and first-excited ${2}^{+}$ states. We also extend the valence-space IM-SRG to calculate radii. Since this particular interaction saturates at too high density, charge radii are still too small compared with experiment. Except for this underprediction, the radius systematics is, however, well reproduced. Our results highlight the renewed importance of nuclear matter as a theoretical benchmark for the development of next-generation chiral interactions.

130 citations

Journal ArticleDOI
TL;DR: In this article, the authors discuss the scientific opportunities for an upgraded RHIC facility, RHIC II, in conjunction with improved capabilities of the two large RHIC detectors, PHENIX and STAR.

130 citations

Journal ArticleDOI
TL;DR: In this article, the effects of meson exchange on the three-body force were investigated up to high baryonic density and it was found that the major role is played by the competition between the strongly repulsive (σ,ω)-exchange term with virtual nucleon-antinucleon excitation and the large attractive contribution due to N ∗ (1440) resonance excitation.

129 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023132
2022299
2021252
2020268
2019256
2018240