科研之友
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摘要
Photoabsorption cross sections of Nd and Smisotopes 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 using the Skyrme energy density functional. The gradual onset of deformation in the ground states as the neutron number increases leads to characteristic features of the shape phase transition. The calculations well reproduce the isotopic dependence of broadening and the 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 5 or more.
- 出版日期2011-2-18
