Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables

Zhang, Fang; Yong, Gao‐Chan

doi:10.1140/epja/i2016-16350-4

Cited by 12 publications

(5 citation statements)

References 56 publications

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“…In the transport model, the in medium thresholds [66,67], the short range correlations of nucleons, especially the high-momentum tail of nucleon momentum distribution in nuclei [68][69][70][71], pion potential and s/p-wave effects [34,72,73], scattering and re-absorption [74][75][76][77], etc. affect pion production in heavy-ion collisions.…”

Section: Conclusion and Discussionmentioning

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: Conclusion and Discussionmentioning

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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“…Since there are no effects of the symmetry energy on the produced energetic nucleons and resonances, the threshold effect on energetic pion production can be also neglected [38]. Of course, there are also some others theoretical uncertainties which affect the value of energetic charged pion ratio, such as initialization of nucleon distribution in coordinates and momentum space in projectile and target nuclei, dynamical self-energies due to nucleon-nucleon short-range correlations and core polarization [39], off-shell pion transport [40], etc. However, all the above effects on energetic charged pion ratio are negligible [39,40].…”

Section: Resultsmentioning

confidence: 99%

A possible probe of the new fifth force

Yong

2018

Preprint

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The proposed protophobic fifth force in Phys. Rev. Lett. 117 , 071803 (2016) recently attracts much attention. To confirm or refute the existence of this new interaction, here I propose a method to probe the protophobic fifth force in dense matter that formed in nucleus-nucleus collisions. As expected, the protophobic fifth force has negligible effects on the usual observables in nucleusnucleus collisions. While the protophobic fifth force evidently affects the value of final positively and negatively charged pions ratio at very high kinetic energies. The signal thus could be used to probe the protophobic fifth force in dense matter by nucleus-nucleus collisions' experiments at current experimental equipments worldwide.

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“…Phenomenological approaches have been proposed to study the above two SRC effects. One is to modify the phase-space distributions of nucleons in the incident nuclei by adding by hand a high-momentum tail [113] to study initial-state effects from first-chance collisions [101,114,115]. A second is to reduce the kinetic symmetry energy by a phenomenological factor, with the remaining kinetic correlation energy added to the potential symmetry energy [116], to study the energetic effects of SRCs during the collision.…”

Section: Discussion and Outlookmentioning

confidence: 99%

“…Γ N π ∆ is the partial decay width into the channel N and π, Γ N π ∆ =0. 115 GeV, and l is the decay angular momentum of the exit channel (l=1).…”

Section: Historymentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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Transport models are the main method to obtain physics information on the nuclear equation of state and in-medium properties of particles from low to relativistic-energy heavy-ion collisions. The Transport Model Evaluation Project (TMEP) has been pursued to test the robustness of transport model predictions in reaching consistent conclusions from the same type of physical model. To this end, calculations under controlled conditions of physical input and set-up were performed with various participating codes. These included both calculations of nuclear matter in a box with periodic boundary conditions, which test separately selected ingredients of a transport code, and more realistic calculations of heavy-ion collisions. Over the years, five studies have been performed within this project. In this intermediate review, we summarize and discuss the present status of the project. We also provide condensed descriptions of the 26 participating codes, which contributed to some part of the project. These include the major codes in use today. After a compact description of the underlying transport approaches, we review the main results of the studies completed so far. They show, that in box calculations the differences between the codes can be well understood and a convergence of the results can be reached. These studies also highlight the systematic differences between the two families of transport codes, known under the names of Boltzmann-Uehling-Uhlenbeck (BUU) and Quantum Molecular Dynamics (QMD) type codes. However, when the codes were compared in full heavy-ion collisions using different physical models, as recently for pion production, they still yielded substantially different results. This calls for further comparisons of heavy-ion collisions with controlled models and of box comparisons of important ingredients, like momentum-dependent fields, which are currently underway. Our evaluation studies often indicate improved strategies in performing transport simulations and thus can provide guidance to code developers. Results of transport simulations of heavy-ion collisions from a given code will have more significance if the code can be validated against benchmark calculations such as the ones summarized in this review.

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Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables

Cited by 12 publications

References 56 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

A possible probe of the new fifth force

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

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