Decay modes of highly excited nuclei

Zhang, Zhen-Fang; De-Qing, Fang; Ma, Yugang

doi:10.1007/s41365-018-0427-8

Cited by 23 publications

(17 citation statements)

References 43 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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“…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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“…The IQMD model is an extended version of the quantum molecular dynamics model, which uses a many-body theory to describe the dynamical behavior of heavy-ion collisions at intermediate energies [25,48,[50][51][52][53]. In the IQMD model, each nucleon is represented by a Gaussian wave packet, i.e.,…”

Section: Modelmentioning

confidence: 99%

Finite-size scaling phenomenon of nuclear liquid-gas phase transition probes

Liu

Fang

2019

Phys. Rev. C

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Based on the isospin-dependent quantum molecular dynamics model, finite-size scaling effects on nuclear liquid-gas phase transition probes are investigated by studying the de-excitation processes of six thermal sources of different sizes with the same initial density and similar N/Z. Using several probes including the total multiplicity derivative (dMtot/dT ), second moment parameter (M2), intermediate mass fragment (IMF) multiplicity (NIMF ), Fisher's power-law exponent (τ ), and Ma's nuclear Zipf's law exponent (ξ), the relationship between the phase transition temperature and the source size has been established. It is observed that the phase transition temperatures obtained from the IMF multiplicity, Fisher's exponent, and Ma's nuclear Zipf's law exponent have a strong correlation with the source size. Moreover, by employing the finite-size scaling law, the critical temperature Tc and the critical exponent ν have been obtained for infinite nuclear matter.

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Decay modes of highly excited nuclei

Cited by 23 publications

References 43 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

Short range correlations in the extended quantum molecular dynamics model

Finite-size scaling phenomenon of nuclear liquid-gas phase transition probes

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