Speaker
Dr
Tsunenori Inakura
(RIKEN)
Description
We have carried out systematic calculations of the electric dipole modes up to mass A=110 region using Skyrme-Hartree-Fock plus RPA approach in fully self-consistent manner. We solved the RPA equation in 3D coordinate space for both spherical and deformed nuclei. We found that the low-angular momentum orbit in neutron-rich nuclei is a key ingredient for emergence of low-lying dipole mode, which is often called pygmy dipole resonance (PDR). The PDRs in light nuclei consist of the single-particle excitations to continuum states. On going to heavier nuclei, the PDRs obtain the collectivity, namely, are made of superposition of the single-particle excitations to loosely bound orbit. We also found that the photoabsorption cross sections cumulated up to 10 MeV has a strong correlation with the neutron skin thickness in all isotope when the PDR grows up. This means that the cross section can be a good indicator to measure the neutron skin thickness.
Primary author
Dr
Tsunenori Inakura
(RIKEN)
Co-authors
Kazuhiro Yabana
(Univ. of Tsukuba)
Takashi Nakatsukasa
(RIKEN)
