Separation of Pygmy Dipole and M1 Resonances in Zr90 by a High-Resolution Inelastic Proton Scattering Near 0°

C. Iwamoto, H. Utsunomiya, A. Tamii, H. Akimune, H. Nakada, T. Shima, T. Yamagata, T. Kawabata, Y. Fujita, H. Matsubara, Y. Shimbara, M. Nagashima, T. Suzuki, H. Fujita, M. Sakuda, T. Mori, T. Izumi, A. Okamoto, T. Kondo, B. Bilgier, H. C. Kozer, Y.-W. Lui, and K. Hatanaka
Phys. Rev. Lett. 108, 262501 – Published 27 June 2012

Abstract

A high-resolution measurement of inelastic proton scattering off Zr90 near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7–12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at EPDR=9.15±0.18MeV with ΓPDR=2.91±0.64MeV and at EM1=9.53±0.06MeV with ΓM1=2.70±0.17MeV in the Lorentzian function, respectively. The B(E1) value for pygmy dipole resonance over 7–11 MeV is 0.75±0.08e2fm2, which corresponds to 2.1±0.2% of the Thomas-Reiche-Kuhn sum rule.

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  • Received 28 April 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.262501

© 2012 American Physical Society

Authors & Affiliations

C. Iwamoto1, H. Utsunomiya1, A. Tamii2, H. Akimune1, H. Nakada3, T. Shima2, T. Yamagata1, T. Kawabata4, Y. Fujita5, H. Matsubara2, Y. Shimbara6, M. Nagashima6, T. Suzuki2, H. Fujita2, M. Sakuda7, T. Mori7, T. Izumi7, A. Okamoto1, T. Kondo1, B. Bilgier8, H. C. Kozer8, Y.-W. Lui9, and K. Hatanaka2

  • 1Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
  • 2Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 3Department of Physics, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage, Chiba 263-8522, Japan
  • 4Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 5Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
  • 6Department of Physics, Niigata University, Niigata 950-21-2, Japan
  • 7Department of Physics, Okayama University, Okayama 900-0082, Japan
  • 8Department of Physics, Istanbul University, Istanbul 34134, Turkey
  • 9Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA

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Vol. 108, Iss. 26 — 29 June 2012

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