Isovector dipole resonance and shear viscosity in low energy heavy-ion collisions

Guo, Chong-Qiang; Ma, Yugang; He, W.; Cao, X. G.; Fang, DQ; Deng, Xian-Gai; Zhou, C. L.

doi:10.1103/physrevc.95.054622

Cited by 16 publications

(7 citation statements)

References 58 publications

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“…However, they did not validate that their model was accurately predicting viscosity-related observables by comparing to experimental data; therefore, their result is helpful for gaining a qualitative understanding of a theoretical relationship, but it is less reliable for learning about absolute bulk properties. Finally, the relaxation-time approaches [18,19] are suitable for order-of-magnitude estimates, but not for quantitative assessments.…”

Section: Shear Viscositymentioning

confidence: 99%

Shear viscosity from nuclear stopping

Barker

Danielewicz

2019

Phys. Rev. C

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Within a Boltzmann transport model, we demonstrate correlation between stopping observables and shear viscosity in central nuclear collisions at intermediate energies (on the order of 10-1000MeV/nucleon). The correlation allows us to assess the viscosity of nuclear matter, by tuning the in-medium nucleon-nucleon cross section in our transport model to agree with nuclear stopping data. We also calculate the ratio of shear viscosity to entropy density to determine how close the system is to the universal quantum lower limit proposed in the context of ultrarelativistic heavy ion collisions. * bbarker@roosevelt.edu 1 arXiv:1612.04874v3 [nucl-th]

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Section: Shear Viscositymentioning

confidence: 99%

Shear viscosity from nuclear stopping

Barker

Danielewicz

2019

Phys. Rev. C

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“…On the other hand, the α-clustering phenomenon as a novel nuclear structure has received great attention in recent years. 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.…”

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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“…[34,58,59]. The isovector giant dipole moment in coordinator space D R (t) and in momentum space D K (t) can be written as follows, respectively [60][61][62][63][64][65][66][67]…”

Section: B Gdr Algorithmmentioning

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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Isovector dipole resonance and shear viscosity in low energy heavy-ion collisions

Cited by 16 publications

References 58 publications

Shear viscosity from nuclear stopping

Shear viscosity from nuclear stopping

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

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