High 
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 squeezed-out 
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 ratio as a probe of 
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 of the symmetry energy

Guo, Youming; Yong, Gao‐Chan

doi:10.1103/physrevc.100.014617

Cited by 9 publications

(6 citation statements)

References 78 publications

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“…Similarly, we can also study the density region of the symmetry energy probed by the π − /π + ratio through the Taylor expanded symmetry energy method [62] From this expression, it is seen that the slope L is relevant to the symmetry energy around saturation density, but the curvature K sym is more related to the symmetry energy far from saturation point. Whether an observable probes the high-density symmetry energy or not, the simple way is to see if that observable is sensitive to the K sym .…”

Section: ( )mentioning

confidence: 99%

“…If the effects of the K sym on the observable is larger than that of the slope L, then the observable can be a potential probe of the high-density symmetry energy. In the simulations, different from the RMF effective field [63,64], a Hartree-Fock calculation using the Gogny effective interaction single nucleon potential is used [62,65]. Figure 5 shows, respectively, the density-dependent symmetry energies with the slope L= 40 MeV, curvatures K sym =0 and −400 MeV and the case L=80 MeV, K sym =0 MeV.…”

Section: ( )mentioning

confidence: 99%

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Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio

Yong¹,

Gao²,

Wei³

et al. 2019

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

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The nuclear symmetry energy around or below saturation density has been extensively studied and roughly pinned down, while its behavior at suprasaturation densities is rather uncertain. Related experimental studies are being carried out or planned at facilities that offer radioactive beams worldwide. Towards the physical goal of probing the nuclear symmetry energy at high densities, π measurements in the medium nuclei 132Sn + 124Sn collisions at 300 or 200 MeV/nucleon incident beam energies are ongoing at the Radioactive Isotope Beam Facility at RIKEN in Japan. However, our studies show that the observable π−/π+ ratio in the 132Sn + 124Sn reactions at 300 or 200 MeV/nucleon incident beam energies mainly probes the symmetry energy around the saturation density. Only the π−/π+ ratio in the heavy reaction system and at relatively high incident beam energies may mainly probe the symmetry energy at suprasaturation densities.

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Section: ( )mentioning

confidence: 99%

Section: ( )mentioning

confidence: 99%

Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio

Yong¹,

Gao²,

Wei³

et al. 2019

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

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“…2, it is seen that the effects of the in-medium baryon-baryon inelastic scattering cross section on the energetic n/p ratio reach about measurable 15%. It is known that the squeezed-out energetic neutron to proton ratio n/p is very sensitive to the symmetry energy [46,47]. To see whether the present analyzed energetic n/p ratio is sensitive to the symmetry energy or not, for the in-medium cases in Fig.…”

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confidence: 77%

Probing in-medium nucleon-nucleon inelastic scattering cross section by using energetic n/p ratio

Zhang,

Guo,

Yong

2020

Preprint

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The frequently mentioned meson in heavy-ion collisions at intermediate energies is π, which is the lightest meson produced via nucleon-nucleon inelastic scatterings. Nowadays consensus has been reached on free nucleon-nucleon inelastic scatterings while its in-medium form is still in arguments and rarely constrained. Based on the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, the in-medium nucleon-nucleon inelastic scattering is explored. It is found that the in-medium modification of nucleon-nucleon inelastic scatterings evidently reduces the neutron to proton ratio n/p at higher kinetic energies. Though the in-medium modification of nucleonnucleon inelastic scatterings, as expected, affects the value of π − /π + ratio, considering a series of undetermined properties of delta resonance and π in medium, the energetic neutron to proton ratio n/p is more suitable to be used to probe the in-medium correction of nucleon-nucleon inelastic scatterings.

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“…Based on large acceptance apparatus FOPI, the yield and ratio of pions of 40 Ca + 40 Ca, 96 Ru + 96 Ru and 96 Zr + 96 Zr reactions at 0.4-1.93 GeV/nucleon [10] are also measured. They could provide information about the equation of state (EOS) [11][12][13][14], short-range correlations [15] and medium effects in scattering cross sections [16,17]. Both theoretical and experimental studies have pointed out that the π meson is one of the most promising probes to study the nuclear structure and reaction aspects of HIC [12,13,17,18].…”

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confidence: 99%

Initialization effects of nucleon profile on the π yields in heavy-ion collisions at medium energies

Yang¹,

Michel²,

Fan³

et al. 2021

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

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We study the problem of π production in heavy-ion collisions in the context of the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model. We generated nucleon densities using two different models, the Skyrme-Hartree-Fock (SHF) model and the configuration interaction shell model (SM). Indeed, inter-nucleon correlations are explicitly taken into account in SM, while they are averaged in the SHF model. As an application of our theoretical frameworks, we calculated the π − and π + yields in collisions of nuclei with A = 30-40 nucleons. We used different harmonic oscillator lengths b HO to generate the harmonic oscillator basis for SM in order to study both theoretical and experimental cases. It is found that the SM framework with b HO = 2.5 fm and SHF can be distinguished by the yield of π mesons, in this case the density distribution calculated by the SM produces more π in the collision. In comparison, SM with b HO = 2.0 fm is distinguished from SHF by the double π − /π + ratios with different large impact parameters, from which one can find that the double π − /π + ratios of SM change smoother and are less than those of SHF.

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High pt squeezed-out n/p ratio as a probe of Ksym of the symmetry energy

Cited by 9 publications

References 78 publications

Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio

Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio

Probing in-medium nucleon-nucleon inelastic scattering cross section by using energetic n/p ratio

Initialization effects of nucleon profile on the π yields in heavy-ion collisions at medium energies

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