Spin-isospin flip giant resonances and shell dependence in 7Li and 9Be by π+ photoproduction

K. Shoda, S. Tôyama, K. Takeshita, T. Kobayashi, and H. Tsubota
Phys. Rev. C 59, 3196 – Published 1 June 1999
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Abstract

The giant resonances of spin-isospin flip mode are studied by measuring the energy and angular distributions of π+ electroproduced from 7Li and 9Be nuclei. Several strong π+ groups are found and angular distributions of these groups are analyzed by distorted-wave impulse approximation calculations using the single particle shell model. The experimental cross section of the groups corresponds to an order of the charge exchange single particle transition strength, establishing them as spin-isospin flip giant resonances. The shell model nature of (γ,π+) results for 1p3/2 shell nuclei are summarized and presented together with previously published data. The obtained results are compared to previously published data for (π,γ), (n,p), (e,ep), and (p,2p) reactions. Strong transitions consistent with the giant resonance excitations from the 1s1/2 shell in the core and from the 1p3/2 valence shell are observed.

  • Received 1 December 1997

DOI:https://doi.org/10.1103/PhysRevC.59.3196

©1999 American Physical Society

Authors & Affiliations

K. Shoda, S. Tôyama*, K. Takeshita, and T. Kobayashi

  • Laboratory of Nuclear Science, Tohoku University, Sendai 989-0826, Japan

H. Tsubota

  • Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan

  • *Present address: Tokai Works, Power Reactor and Nuclear Fuel Development Corporation, Tokaimura, Ibaraki 311-1393, Japan.
  • Present address: Spring-8 ring A, Japan Synchrotron Radiation Research Institute, Hyogo 678-12, Japan.
  • Present address: College of Radiology, Teikyo University, Hachioji, Tokyo 173-8605, Japan.

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Vol. 59, Iss. 6 — June 1999

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