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

Abstract

The $\alpha$ (${}^4$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 $\alpha$-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 $\alpha$ + deuteron as well as the three-body structure with $\alpha$ + $n$ + $p$, and found that the major $\alpha$-clustering contribution on the GDR peak is located at around 31 MeV, while the resonance contributions between clusters, namely $\alpha$ 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 $\alpha$ + n + $\alpha$ configuration can somehow explain its GDR results.

8 pages, 5 figures

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Cited by in corpus (11)

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• System dependence of away-side broadening and $\alpha$-clustering light nuclei structure effect in dihadron azimuthal correlations
• Electromagnetic fields in ultra-peripheral relativistic heavy-ion collisions
• Short range correlations in the extended quantum molecular dynamics model
• Effect of initial-state geometric configurations on the nuclear liquid-gas phase transition
• Nuclear giant quadruple resonance within transport approach and its constraint on nucleon effective mass
• Signatures of an $\alpha$ + core structure in ${}^{44}$Ti + ${}^{44}$Ti collisions at $\sqrt{s_{NN}}=5.02$ TeV by a multiphase transport model
• Reactions induced by 30 MeV 3He beam on 9Be: Cluster transfer reactions
• Constraining neutron-proton effective mass splitting through nuclear giant dipole resonance within transport approach
• Isovector giant dipole resonance mode with an improved propagation approach in the framework of EQMD model
• Branching ratio and information entropy for the p+${}^{12}$C reaction in the extended-quantum-molecular-dynamics model