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The deformation evolution of giant dipole resonance (GDR), in the chains ofSm and Nd isotopes, are investigated in the framework of an extended quantummolecular dynamics (EQMD) model. The mass number dependence of resonance peakposition $(E_{m})$ in the major and minor axis directions of deformed nuclei aswell as the difference $\Delta E_{m}$ between them are described in detail. Thecorrelation between the splitting ($\Delta E_{m} /\bar{E}_m $) of the GDRspectra and the deformation($ \beta_{2}$) is further studied. The resultsconfirm that $\Delta E_{m} /\bar{E}_m $ is proportional to $ \beta_{2}$. Bycomparing the calculation with the experimental data on photon absorption crosssection $\sigma_{\gamma}$, it shows that the EQMD model can quite wellreproduce the shape of GDR spectra from spherical to prolate shape. The GDRshapes 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 isfound that the calculated GDR spectrum in the EQMD model is perfectlyconsistent with the experimental results when $E_{sym}$ equals to 32 MeV.

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