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Pygmy dipole resonance and dipole polarizability in 90Zr

Year: 2014
Type: conference-paper
Abstract: Electric dipole (E1) reduced transition probability B(E1) of 90Zr 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 αD 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.
DOI: 10.1063/1.4874105
Authors: C. Iwamoto, A. Tamii, H. Utsunomiya, H. Akimune, H. Nakada, T. Shima, T. Hashimoto, T. Yamagata, T. Kawabata, Y. Fujita, H. Matsubara, T. Suzuki, H. Fujita, Y. Shimbara, M. Nagashima, M. Sakuda, T. Mori, T. Izumi, A. Okamoto, T. Kondo, T.-W. Lui, B. Bilgier, H. C. Kozer, K. Hatanaka
Institutions: Research Center for Nuclear Physics, The University of Osaka, The University of Osaka, Konan University, Chiba University, Kyoto University, RIKEN, RIKEN Nishina Center, Niigata University, Okayama University, Texas A&M University, Istanbul University
Language: English
Open Access status: bronze
OpenAlex ID: W2036060495
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