Dipole responses in Nd and Sm isotopes with shape transitions

Abstract

Photoabsorption cross sections of Nd and Sm isotopes from spherical to deformed even nuclei are systematically investigated by means of the quasiparticle-random-phase approximation based on the Hartree-Fock-Bogoliubov ground states (HFB+QRPA) using the Skyrme energy density functional. The gradual onset of deformation in the ground states as increasing the neutron number leads to characteristic features of the shape phase transition. The calculation well reproduce the isotopic dependence of broadening and emergence of a double-peak structure in the cross sections without any adjustable parameter. We also find that the deformation plays a significant role for low-energy dipole strengths. The $E1$ strengths are fragmented and considerably lowered in energy. The summed $E1$ strength up to 10 MeV is enhanced by a factor of five or more.

5 pages including 6 figures

References in corpus (8)

• Exotic modes of excitation in atomic nuclei far from stability
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• Broyden's Method in Nuclear Structure Calculations
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Cited by in corpus (3)

• Finite amplitude method for the quasi-particle-random-phase approximation
• Shape changes and large-amplitude collective dynamics in neutron-rich Cr isotopes
• Self-consistent description of nuclear photoabsorption cross sections