Investigation of giant dipole resonance in heavy deformed nuclei with the EQMD model

Abstract

The deformation evolution of giant dipole resonance (GDR), in the chains of Sm and Nd isotopes, are investigated in the framework of an extended quantum molecular dynamics (EQMD) model. The mass number dependence of resonance peak position $(E_m)$ in the major and minor axis directions of deformed nuclei as well as the difference $\Delta E_m$ between them are described in detail. The correlation between the splitting ($\Delta E_m/{\bar{E}}_m$) of the GDR spectra and the deformation(${\beta }_2$) is further studied. The results confirm that $\Delta E_m/{\bar{E}}_m$ is proportional to ${\beta }_2$. By comparing the calculation with the experimental data on photon absorption cross section ${\sigma }_{\gamma }$, it shows that the EQMD model can quite well reproduce the shape of GDR spectra from spherical to prolate shape. The GDR shapes in ${}^{134}$Sm, ${}^{136}$Sm, ${}^{138}$Sm, ${}^{130}$Nd, ${}^{132}$Nd and ${}^{134}$Nd are also predicted. In addition, the symmetry energy coefficient $(E_{sym})$ dependence of GDR spectra of ${}^{150}$Nd is also discussed. It is found that the calculated GDR spectrum in the EQMD model is perfectly consistent with the experimental results when $E_{sym}$ equals to 32 MeV.

arXiv comment6 figures, 8 pages; Physical Review C (in press)

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Cited by in corpus (5)

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• Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model
• Giant dipole resonance and shape evolution in Nd isotopes within TDHF method
• Giant dipole resonance in Sm isotopes within TDHF method
• Isovector giant dipole resonance mode with an improved propagation approach in the framework of EQMD model