Probing the momentum dependence of the symmetry potential by the free<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>n</mml:mi><mml:mo>/</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math>ratio of pre-equilibrium emission

Liu, He-Lei; Yong, Gao‐Chan; Wang, Dehua

doi:10.1103/physrevc.91.024604

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…In order to know in which density region the π − /π + ratio shows maximum sensitivity to the symmetry energy, one way is similar to the studies in [55,56], i.e. in the whole density region (0<ρ<ρ max ) one chooses a specific form of the density-dependent symmetry energy as the standard calculation.…”

Section: The Methodology and Resultsmentioning

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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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: The Methodology and Resultsmentioning

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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“…The impact of the symmetry potential on preequilibrium nucleon emission in heavy-ion collisions was studied in Ref. [52]. Also, experimental data for the nucleon optical potentials from nucleon-nucleus scattering experiments are available [53].…”

Section: E Comparison With Other Workmentioning

confidence: 99%

Nucleon self-energies for supernova equations of state

Hempel

2015

Phys. Rev. C

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Nucleon self-energies and interaction potentials in supernova (SN) matter, which are known to have an important effect on nucleosynthesis conditions in SN ejecta are investigated. Corresponding weak charged-current interaction rates with unbound nucleons that are consistent with existing SN equations of state (EOSs) are specified. The nucleon self-energies are made available online as electronic tables. The discussion is mostly restricted to relativistic mean-field models. In the first part of the article, the generic properties of this class of models at finite temperature and asymmetry are studied. It is found that the quadratic expansion of the EOS in terms of asymmetry works reasonably well at finite temperatures and deviations originate mostly from the kinetic part. The interaction part of the symmetry energy is found to be almost temperature independent. At low densities, the account of realistic nucleon masses requires the introduction of a linear term in the expansion. Finally, it is shown that the important neutron-to-proton potential difference is given approximately by the asymmetry of the system and the interaction part of the zero-temperature symmetry energy. The results of different interactions are then compared with constraints from nuclear experiments and thereby the possible range of the potential difference is limited. In the second part, for a certain class of SN EOS models, the formation of nuclei is considered. Only moderate modifications are found for the self-energies of unbound nucleons that enter the weak charged-current interaction rates. This is because in the present approach the binding energies of bound states do not contribute to the single-particle energies of unbound nucleons.

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Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies

Wang

2020

Front. Phys.

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Probing the momentum dependence of the symmetry potential by the freen/pratio of pre-equilibrium emission

Cited by 9 publications

References 30 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

Nucleon self-energies for supernova equations of state

Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies

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