Nuclear dynamics and particle production near threshold energies in heavy-ion collisions

Zhu, Feng

doi:10.1007/s41365-018-0379-z

Cited by 65 publications

(20 citation statements)

References 144 publications

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“…An extended quantum molecular dynamics model [21], as one of a few microscopic transport models which can give α-clusters with a nice computation performance, has succeeded in describing multifragmentation [22], giant dipole resonance [23][24][25][26], photonuclear reactions [27] as well as collective flow and shear viscosity etc [28,29] at Fermi energy. In comparison with the traditional QMD-type model and its many applications [30][31][32][33][34][35][36][37][38][39][40][41], the EQMD model has been improved in some aspects. For example, a phenomenological Pauli potential was added, the dynamical degree of wave packets was considered, and a friction cooling method for the initialization of nuclei was used.…”

Section: Introductionmentioning

confidence: 99%

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

Shi

Cao

et al. 2020

Phys. Rev. C

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Direct photon produced from first proton-neutron (p-n) collision during the early stage of heavy ion reaction is a sensitive probe to reflect energy and momentum distribution of nucleons. In this work, we embedded the hard photon production channel in an extended quantum molecular dynamics (EQMD) model, and took the direct photon as a possible probe to improve namely the Fermi motion in the EQMD model. A possible scheme is offered to handle the dynamical wave packet width within incoherent bremsstrahlung process. Direct photons calculated by our modified EQMD were compared with data of 14 N + 12 C at beam energies E/A = 20, 30 and 40 MeV, and it is found that the yield, inverse slope and angular distribution of direct photons could be reasonably reproduced. In addition, asymmetric reaction systems of 4 He + C and 4 He + Zn at E/A = 53 MeV are also simulated in this work. It is found that the symmetric angular distribution in the nucleon-nucleon (N-N) center-of-mass (c.m.) frame and the velocity of theγ-emission source can be reasonably obtained from our method although there is some quantitative differences.

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Section: Introductionmentioning

confidence: 99%

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

Shi

Cao

et al. 2020

Phys. Rev. C

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“…Quantum molecular dynamics (QMD) type models [46,47] have been extensively applied for describing reaction dynamics and fragment formation in heavy ion collisions at intermediate energy [48][49][50][51][52]. EQMD model [53] is one of extension versions of QMD model, in which the description of the ground state of the nuclear system has been significantly improved by obtaining the lowest point of energy of the nuclei through the cooling process which cancels the zero-point energy caused by the wave packet broadening in the standard QMD.…”

Section: A Eqmd Model Introductionmentioning

confidence: 99%

Dipole excitation of $^6$Li and $^9$Be studied with an extended quantum molecular dynamics model

Huang,

2021

Preprint

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The α ( 4 He) -clustering structure is a common phenomenon in light nuclei due to the decreasing contribution of mean field in few-body system. In this work we presented calculations of giant dipole resonance (GDR) excitations for two non α-conjugate light nuclei, namely 6 Li and 9 Be, within a framework of an extended quantum molecular dynamics model. For 6 Li, we investigated the GDR spectra from the two-body clustering structure with α + deuteron as well as the threebody structure with α + n + p, and found that the major α-clustering contribution on the GDR peak is located at around 31 MeV, while the resonance contributions between clusters, namely α and deuteron or (n + p), are located on the lower energy side, which can be regarded as pygmy dipole resonance (PDR). For 9 Be, a mixture configuration contribution for the Chain-like structure and Borromean-like structure of the α + n + α configuration can somehow explain its GDR results.

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“…Simulations with transport model in combination with observables in heavy-ion collisions is one of the important way to constrain the high density behavior of E sym (ρ). Several sensitive observables have been presented, but it is still difficult to get a tight and consistent constraint on E sym (ρ) at high densities [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Finding signatures of the nuclear symmetry energy in heavy-ion collisions with deep learning

Wang,

Li,

et al. 2021

Preprint

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Nuclear dynamics and particle production near threshold energies in heavy-ion collisions

Cited by 65 publications

References 144 publications

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

Dipole excitation of $^6$Li and $^9$Be studied with an extended quantum molecular dynamics model

Finding signatures of the nuclear symmetry energy in heavy-ion collisions with deep learning

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