On the Lorentz structure of the symmetry energy

Gaitanos, T.; Toro, M. Di; Typel, S.; Baran, V.; Fuchs, Christian; Greco, V.; Wolter, H.H.

doi:10.1016/j.nuclphysa.2003.12.001

Cited by 232 publications

(300 citation statements)

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“…of mesons should be considered explicitly [5,6,31]. Thus, in this paper, we also investigate the contribution of the Coulomb potentials between mesons and baryons.…”

Section: F15>f05>fa3 F05 Is Larger Than Fa3 For All Densities This mentioning

confidence: 99%

“…More recently, a new value of S 0 ≃ 31 MeV was obtained, based on the consistent folding analysis of the p( 6 He, 6 He)p elastic scattering and p( 6 He, 6 Li * )n charge exchange reaction data measured at E Lab = 41.6 MeV [26], while S 0 = 34 MeV was obtained in a calculation made within the relativistic Brueckner framework, using the Bonn A potential [27]. Thus, it is necessary to further investigate the uncertainty of the S 0 value [28].…”

Section: Introductionmentioning

confidence: 99%

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Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

Li¹,

Li²,

Soff³

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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Based on the ultrarelativistic quantum molecular dynamics (UrQMD) model, the effects of the density-dependent symmetry potential for baryons and of the Coulomb potential for produced mesons are investigated for neutron-rich heavy ion collisions at intermediate energies. The calculated results of the ∆ − /∆ ++ and π − /π + production ratios show a clear beam-energy dependence on the density-dependent symmetry potential, which is stronger for the π − /π + ratio close to the pion production threshold. The Coulomb potential of the mesons changes the transverse momentum distribution of the π − /π + ratio significantly, though it alters only slightly the π − and π + total yields. The π − yields, especially at midrapidity or at low transverse momenta and the π − /π + ratios at low transverse momenta, are shown to be sensitive probes of the density-dependent symmetry potential in dense nuclear matter. The effect of the density-dependent symmetry potential on the production of both, K 0 and K + mesons, is also investigated. † DFG Mercator Guest Professor.

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“…of mesons should be considered explicitly [5,6,31]. Thus, in this paper, we also investigate the contribution of the Coulomb potentials between mesons and baryons.…”

Section: F15>f05>fa3 F05 Is Larger Than Fa3 For All Densities This mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

Li¹,

Li²,

Soff³

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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“…We will use three Lagrangians with constant nucleon-meson couplings (NL... type, see before) and one with density dependent couplings (DDF , see [ 7]), recently suggested for better nucleonic properties of neutron stars [ 17]. In the DDF model the f ρ is exponentially decreasing with density, resulting in a rather "soft" symmetry term at high density.…”

Section: Isospin Effects On Sub-threshold Kaon Production At Intermedmentioning

confidence: 99%

“…Within a covariant picture of the nuclear mean field, for the description of the symmetry energy at saturation (a 4 parameter of the Weizsäecker mass formula) (a) only the Lorentz vector ρ mesonic field, and (b) both, the vector ρ (repulsive) and scalar δ (attractive) effective fields [ 6,7] can be included. In the latter case the competition between scalar and vector fields leads to a stiffer symmetry term at high density [ 6,2].…”

Section: Introductionmentioning

confidence: 99%

Heavy Ion Collisions at Relativistic Energies: Testing a Nuclear Matter at High Baryon and Isospin Density

et al. 2007

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We show that the phenomenology of isospin effects on heavy ion reactions at intermediate energies (few AGeV range) is extremely rich and can allow a "direct" study of the covariant structure of the isovector interaction in the hadron medium. We work within a relativistic transport frame, beyond a cascade picture, consistently derived from effective Lagrangians, where isospin effects are accounted for in the mean field and collision terms. Rather sensitive observables are proposed from collective flows ("differential" flows) and from pion/kaon production (π − /π + , K 0 /K + yields). For the latter point relevant nonequilibrium effects are stressed. The possibility of the transition to a mixed hadron-quark phase, at high baryon and isospin density, is finally suggested. Some signatures could come from an expected "neutron trapping" effect.

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“…Sub-threshold mesons, such as pions and kaons, especially the ratios of different charge states, are good candidates and have been studied extensively. Transport model calculations have shown consistently that near their respective production threshold, the π − /π + [59][60][61][62][63] and K + /K 0 [64] ratios are indeed sensitive to the highdensity symmetry energy although comparisons with limited data available are still inconclusive so far. Generally speaking, more massive mesons probe the E sym (ρ) at higher densities if effects of the final state interactions do not wash out the signal.…”

Section: Introductionmentioning

confidence: 99%

Effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions

Yong

2013

Physics Letters B

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Using a relativistic transport model ART1.0, we explore effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions from 0.2 to 10 GeV/nucleon available at several current and future facilities. The yield of η mesons at sub-threshold energies is found to be very sensitive to the density dependence of nuclear symmetry energy. Above a beam energy of about 5 GeV/nucleon in Au+Au reactions, the sensitivity to symmetry energy disappears. Using the branching ratio of the rare η decay (η → γU ) available in the literature, we estimate the maximum cross section for the U-boson production in the energy range considered, providing a useful reference for future U-boson search using heavy-ion reactions.PACS numbers: 21.65.Mn, 21.65.Ef, 95.35.+d

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On the Lorentz structure of the symmetry energy

Cited by 232 publications

References 50 publications

Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

Probing the density dependence of the symmetry potential in intermediate-energy heavy ion collisions

Heavy Ion Collisions at Relativistic Energies: Testing a Nuclear Matter at High Baryon and Isospin Density

Effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions

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