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In this work, we have studied the isovector giant dipole resonance (IVGDR) ineven-even Sm isotopes within time-dependent Hartree-Fock (TDHF) with fourSkyrme forces SLy6, SVbas, SLy5 and UNEDF1. The approach we have followed issomewhat similar to the one we did in our previous work in the region ofNeodymium (Nd, Z=60)[\href{https://iopscience.iop.org/article/10.1088/1402-4896/ab73d8}{PhysicaScripta (2020)}]. We have calculated the dipole strength of $^{128-164}\text{Sm}$, and compared with the available experimental data. Anoverall agreement between them is obtained. The dipole strength inneutron-deficient $ ^{128-142}\text{Sm}$ and in neutron-rich$^{156-164}\text{Sm}$ isotopes are predicted. Shape phase transition as well asshape coexistence in Sm isotopes are also investigated in the light of IVGDR.In addition, the correlation between the quadrupole deformation parameter$\beta_{2}$ and the splitting $\Delta E/ \bar{E}_{m}$ of the giant dipoleresonance (GDR) spectra is studied. The results confirm that $\Delta E/\bar{E}_{m}$ is proportional to quadrupole deformation $\beta_{2}$

Giant dipole resonance in Sm isotopes within TDHF method