Pygmy Dipole Resonance and Dipole Polarizability in Zr-90

Iwamoto C., Tamii A., Utsunomiya H., Akimune H., Nakada H., Shima T., ...Daha Fazla

12th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG), Tsukuba, Japonya, 18 - 21 Kasım 2013, cilt.1594, ss.426-431 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 1594
  • Doi Numarası: 10.1063/1.4874105
  • Basıldığı Şehir: Tsukuba
  • Basıldığı Ülke: Japonya
  • Sayfa Sayıları: ss.426-431


Electric dipole (El) reduced transition probability B(El) of Zr-90 was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El Coulomb excitation, and the El strength of the pygmy dipole resonance was found in the vicinity of the neutron threshold in the low-energy tail of the giant dipole resonance. Using the data, we plan to determine the precise dipole polarizability alpha(D) which is defined as an inversely energy-weighted sum value of the elecrric dipole strength. The dipole polarizability is expected to constrain the symmetry energy term of the neutron matter equation of state. Thus systematical measurement of the dipole polarizability is important.