Elsevier

Nuclear Physics A

Volume 486, Issues 3–4, 19–26 September 1988, Pages 526-540
Nuclear Physics A

Branching of π+ in 12 C(γ, π+) reaction

https://doi.org/10.1016/0375-9474(88)90161-3Get rights and content

Abstract

The photon difference method is applied to the study of pion emission branches in the 12C(γ,π+) reaction. The π+ spectra at emission angles of 30°, 70°, 110° and 150° have been measured with 200 MeV and 205 MeV electron energy. The difference π+ spectra are analyzed for the known discrete states and highly excited region. The branch cross sections and angular distributions are compared with the results by the Fermi-gas model for quasi-free production and by the shell model. The π+ yields are found to be dominated by the branch to the individual discrete states and giant resonance states in the residual nucleus. The contribution of the quasi-free production seems small.

References (24)

  • M.K. Singham et al.

    Ann. of Phys.

    (1981)
  • W.C. Haxton

    Nucl. Phys.

    (1978)
  • K. Shoda et al.

    Phys. Rev.

    (1986)
  • F. Borkowski et al.

    Phys. Rev. Lett.

    (1977)
  • J. Arends et al.

    Z. Phys.

    (1982)
  • K. Shoda et al.

    Nucl. Phys.

    (1988)
  • F.A. Brieva et al.

    Nucl. Phys.

    (1977)
  • W.C. Haxton

    Phys. Lett.

    (1980)
  • M. Gmitro
  • M. Lax et al.

    Phys. Rev.

    (1951)
  • W.M. MacDonald et al.

    Phys. Rev.

    (1979)
  • K. Shoda et al.

    Phys. Rev. Lett.

    (1977)

    Nucl. Phys.

    (1980)
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    1

    Present address: National Laboratory for High-Energy Physics, Ibaraki 305, Japan.

    2

    Present address: Institute for Nuclear Study, University of Tokyo, Tanashi 188, Japan.

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