Secondary decay effects of the isospin fractionation in the projectile fragmentation at GeV/nucleon

Guo, Chenchen; Su, Jun; Zhu, Long

doi:10.1007/s41365-020-00832-4

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…Quantum Molecular Dynamics (QMD) model is a molecular dynamics model, from which we can get the information on both the collision dynamics and the phase space information [32][33][34][35][36]. The IQMD model is based on the traditional QMD model, by including the isospin degree of freedom of nucleons [37].…”

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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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 canonical evolution equation of the system is obtained by variational method. After the introduction of coalescence method or coupling with statistical decay model, it has a good description of the nuclear fragmentation process [26][27][28][29][30]. The traditional QMD model is more suitable for the description of medium heavy nuclei, and can give rich physical information for intermediate energy nuclear reactions.…”

Section: A Eqmd Modelmentioning

confidence: 99%

Short range correlations in the extended quantum molecular dynamics model

Shen,

Huang,

2021

Preprint

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Short-range potential has been added into an extended quantum molecular dynamics (EQMD) model. The RMS radius, binding energy and momentum distribution of 12 C with different initial structures and short-range potential parameters have been checked. The separation energy of 12 C(p,2p) 11 B reaction is calculated and compared with the experimental data, it indicates that our modified EQMD model can be taken as a reliable tool for studying proton pair knock-out reaction. Furthermore, the short range correlation effects on emission time and momentum spectrum of two protons are discussed. Finally, the momentum correlation function of the emitted proton pair is calculated by the Lednicky and Lyuboshitz's analytical method. The result explains that short-range repulsion causes high momentum tail and weakens the momentum correlation function.

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“…Nuclear symmetry energy, which describes the energy difference between pure neutron matter and isospin symmetric (with equal numbers of protons and neutrons) nuclear matter, is one of the crucial quantities for studying the structures and the properties of nuclei and neutron stars, the dynamics of heavy-ion collision, supernovae explosions, as well as neutron star mergers [1][2][3][4][5][6][7][8][9][10][11][12][13]. Exploring nuclear symmetry energy at various densities is one of the important scientific goals for intermediate-energy heavy-ion collision (HIC) studies in terrestrial laboratories [14][15][16][17][18][19][20][21][22][23]. Quite a few observables have been found or predicted to be sensitive to the nuclear symmetry energy as, e.g., neutron and proton yields and flow ratios, double ratios, or differences, 3 H/ 3 He yield ratio, π − /π + and K 0 /K + meson production ratios, the Σ − /Σ + ratio [24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Effect of Initial Fluctuations on Isospin-Sensitive Observables from Heavy-Ion Collisions at Intermediate Energies

Wang

Gao

2021

Symmetry

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Initial fluctuation is one of the ingredients that washes fingerprints of the nuclear symmetry energy on observables in heavy-ion collisions. By artificially using the same initial nuclei in all collision events, the effect of the initial fluctuation on isospin-sensitive observables, e.g., the yield ratio of free neutrons with respect to protons Nn/Np, 3H/3He yield ratio, the yield ratio between charged pions π−/π+, and the elliptic flow ratio or difference between free neutrons and protons v2n/v2p (v2n-v2p), are studied within the ultrarelativistic quantum molecular dynamics (UrQMD) model. In practice, Au + Au collisions with impact parameter b = 5 fm and beam energy Elab = 400 MeV/nucleon are calculated. It is found that the effect of the initialization on the yields of free protons and neutrons is small, while for the yield of pions, the directed and elliptic flows are found to be apparently influenced by the choice of initialization because of the strong memory effects. Regarding the isospin-sensitive observables, the effect of the initialization on Nn/Np and 3H/3He is negligible, while π−/π+ and v2n/v2p (v2n-v2p) display a distinct difference among different initializations. The fingerprints of symmetry energy on π−/π+ and v2n/v2p can be either enhanced or reduced when different initializations are utilized.

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Secondary decay effects of the isospin fractionation in the projectile fragmentation at GeV/nucleon

Cited by 10 publications

References 34 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

Short range correlations in the extended quantum molecular dynamics model

Quantifying the Effect of Initial Fluctuations on Isospin-Sensitive Observables from Heavy-Ion Collisions at Intermediate Energies

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