Probing neutron–proton effective mass splitting using nuclear stopping and isospin mix in heavy-ion collisions in GeV energy region

Zhang, Fan; Su, Jun

doi:10.1007/s41365-020-00787-6

Cited by 23 publications

(7 citation statements)

References 52 publications

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“…The nucleon-nucleon collision cross section in the medium (σ med N N ) can be expressed as taken in Refs. [40][41][42]…”

Section: A the Iqmd Modelmentioning

confidence: 99%

Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam} = 1.23$$A$ GeV by the IQMD model

Fang,

Ma,

Zhang

2022

Preprint

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We used an Isospin dependent Quantum Molecular Dynamics (IQMD) model to simulate Au + Au collisions at beam energy E beam = 1.23A GeV, which corresponds to center of mass energy √ sNN = 2.4 GeV. Firstly, we obtained reasonable rapidity and transverse mass spectra of π − and π + as well as "apparent" temperature parameters in comparison with the HADES data. Then by calculating three-dimensional Hanbury Brown and Twiss (HBT) radius of same charged pion-pairs, we obtained the square difference of outward radius and sideward radius, i.e. R 2 out − R 2 side , as well as the freeze-out volume (V f o ), which were basically consistent with the trend of HADES experimental results. The azimuthal dependence of the HBT radii was also calculated by a matrix method, and corrected by the rotation matrix. In addition, the eccentricities of the xy-and zy-planes of pion-pair emissions were also extracted for different pair transverse momentum and collision centrality, which show that the xy-eccentricity increases with pair transverse momentum as well as centrality but not for zy-eccentricity, indicating a more asymmetric transverse emission of particle-pairs with higher transverse momentum in off-central collisions.

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“…The nucleon-nucleon collision cross section in the medium (σ med N N ) can be expressed as taken in Refs. [40][41][42]…”

Section: A the Iqmd Modelmentioning

confidence: 99%

Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam} = 1.23$$A$ GeV by the IQMD model

Fang,

Ma,

Zhang

2022

Preprint

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“…The final-state products are naturally various kinds of particles. Indeed, understanding the characteristics of particle productions is particularly necessary for researchers to study the evolution of collision system and interactions among various particles [78][79][80][81][82][83][84][85]. By studying the particle spectra, this paper has extracted some quantities.…”

Section: B Tendencies Of Parametersmentioning

confidence: 99%

Thermal freeze-out parameters and pseudo-entropy from charged hadron spectra in high energy collisions

Zhang,

Gao,

Liu

et al. 2021

Preprint

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We collected the transverse momentum (mass) spectra of charged hadrons (π − , π + , K − , K + , p, and p) produced in collisions over a center-of-mass energy range from 2.70 to 200 GeV (per nucleon pair). The modified Tsallis-Pareto-type function (the TP-like function) with average transverse flow velocity is used to describe the contribution of participant or constituent quarks to transverse momentum of considered hadron. The experimental spectra of π ∓ and K ∓ (or p and p) are fitted by the convolution of two (or three) TP-like functions due to the fact that two (or three) constituent quarks are regarded as two (or three) energy resources in the formation of considered hadron. From the reasonable fits to the spectra, the thermal freeze-out parameters are extracted, and the pseudo-entropy is newly defined and extracted. Some parameters quickly change in the energy range of less than 7.7 GeV, and slowly change in the energy range of greater than 7.7 GeV, indicating the variation of collision mechanism at around 7.7 GeV.

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“…Generally there are two types of transport models, i.e. Boltzmann-Uehling-Uhlenbeck type and quantum molecular dynamics type for describing heavy-ion collisions at low and intermediate energies [41][42][43][44][45][46][47] and had numerous applications [48][49][50][51][52][53][54][55][56][57][58][59]. In this work, an improved quantum molecular dynamics (ImQMD) model is utilized [60].…”

Section: A Imqmd Modelmentioning

confidence: 99%

Green-Kubo formula for Boltzmann and Fermi-Dirac statistics

Deng,

Ma,

Zhang

2021

Preprint

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Shear viscosity of nuclear matter is extracted via the Green-Kubo formula and the Gaussian thermostated SLLOD algorithm (the shear rate method) in a periodic box by using an improved quantum molecular dynamic (ImQMD) model without mean field, also it is calculated by a Boltzmann-type equation. Here a new form of the Green-Kubo formula is put forward in the present work. For classical limit at nuclear matter densities of 0.4ρ0 and 1.0ρ0, shear viscosity by the traditional and new form of the Green-Kubo formula as well as the SLLOD algorithm are coincident with each other. However, for non-classical limit, shear viscosity by the traditional form of the Green-Kubo formula is higher than those obtained by the new form of the Green-Kubo formula as well as the SLLOD algorithm especially in low temperature region. In addition, shear viscosity from the Boltzmanntype equation is found to be less than that by the Green-Kubo method or the SLLOD algorithm for both classical and non-classical limits.

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Probing neutron–proton effective mass splitting using nuclear stopping and isospin mix in heavy-ion collisions in GeV energy region

Cited by 23 publications

References 52 publications

Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam} = 1.23$$A$ GeV by the IQMD model

Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam} = 1.23$$A$ GeV by the IQMD model

Thermal freeze-out parameters and pseudo-entropy from charged hadron spectra in high energy collisions

Green-Kubo formula for Boltzmann and Fermi-Dirac statistics

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