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Title: Pygmy dipole resonance and dipole polarizability in {sup 90}Zr

Electric dipole (E1) reduced transition probability B(E1) of {sup 90}Zr 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 E1 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 α{sub 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.
Authors:
; ; ; ; ; ;  [1] ; ; ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [7] ; ;  [8] more »; « less
  1. Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047 (Japan)
  2. Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501 (Japan)
  3. Department of Physics, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage, Chiba 263-8522 (Japan)
  4. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)
  5. Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043 (Japan)
  6. RIKEN Nishina Center, Wako, Saitama 351-0198 (Japan)
  7. Department of Physics, Niigata University, Niigata 950-21-2 (Japan)
  8. Department of Physics, Okayama University, Okayama 900-0082 (Japan)
Publication Date:
OSTI Identifier:
22280497
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR DISTRIBUTION; COULOMB EXCITATION; DWBA; E1-TRANSITIONS; ELECTRIC DIPOLES; EQUATIONS OF STATE; HARTREE-FOCK METHOD; MEV RANGE; NEUTRONS; NUCLEAR MATTER; POLARIZABILITY; PROTON BEAMS; PROTON REACTIONS; PROTONS; RANDOM PHASE APPROXIMATION; RESONANCE; SCATTERING; ZIRCONIUM 90; ZIRCONIUM 90 TARGET