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

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• Shape evolution of giant resonances in Nd and Sm isotopes
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• Feasibility of the finite amplitude method in covariant density functional theory
• Finite amplitude method applied to giant dipole resonance in heavy rare-earth nuclei
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• Microscopic derivation of the Bohr-Mottelson collective Hamiltonian and its application to quadrupole shape dynamics
• Fragmentation of electric dipole strength in N=82 isotones
• Collective excitations of $\Lambda$ hypernuclei
• Non-iterative finite amplitude methods for E1 and M1 giant resonances
• Self-consistent description of nuclear photoabsorption cross sections
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• Giant dipole resonance and shape evolution in Nd isotopes within TDHF method
• $\beta$-decay half-lives as an indicator of shape-phase transition in neutron-rich Zr isotopes with particle-vibration coupling effect
• QRPA calculations for M1 transitions with the noniterative finite amplitude method and the application to neutron radiative capture cross sections
• Pairing and nonaxial-shape correlations in $N=150$ isotones
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• Charge-exchange dipole excitations in deformed nuclei
• Multipole responses in fissioning nuclei and their uncertainties
• Comparative study of the requantization of the time-dependent mean field for the dynamics of nuclear pairing
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• Real-time calculations of many-body dynamics in quantum systems