Giant dipole resonance in Sm isotopes within TDHF method

In this work, we have studied the isovector giant dipole resonance (IVGDR) in even-even Sm isotopes within time-dependent Hartree-Fock (TDHF) with four Skyrme forces SLy6, SVbas, SLy5 and UNEDF1. The approach we have followed is somewhat similar to the one we did in our previous work in the region of neodymium (Nd, Z = 60) [Physica Scripta (2020)]. We have calculated the dipole strength of Sm128-164 and compared with the available experimental data. An overall agreement between them is obtained. The dipole strength in neutron-deficient Sm128-142 and in neutron-rich Sm156-164 isotopes is predicted. Shape phase transition and shape 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/(E) over bar (m) of the giant dipole resonance spectra is studied. The results confirm that Delta E/(E) over bar (m) is proportional to quadrupole deformation beta(2).

Automated summary

This study investigated the IVGDR in even-even Sm isotopes using TDHF, comparing calculated dipole strength with experimental data for Sm128-164. Predictions were made for less neutron-rich Sm128-142 and neutron-rich Sm156-164 isotopes. The correlation between quadrupole deformation and giant dipole resonance spectra was also examined.