Elastic and inelastic photon scattering on 12C and 16O in the Δ-resonance region

doi:10.1016/0375-9474(87)90461-1

Nuclear Physics A

Volume 466, Issues 3–4, 11–18 May 1987, Pages 652-666

https://doi.org/10.1016/0375-9474(87)90461-1 Get rights and content

Abstract

Elastic and inelastic photon scattering on ¹²C and ¹⁶O in the Δ resonance region have been studied within an extended isobar doorway approach, which includes open shell configurations both in ground and excited states. Medium effects to Δ-propagation are found to be important for elastic scattering. The structure functions for scattering of linearly polarized photons have also been calculated. Medium effects show up more markedly in the cross sections for polarized photons. Inelastic scattering has been studied for the excitation of the 2⁺(4.44 MeV) state in ¹²C using various nuclear models. The cross section at forward angles is found to be particularly model-dependent.

References (12)

J.H. Koch et al.
Ann. of Phys.
(1984)
M. Hirata et al.
Ann. of Phys.
(1977)
M. Hirata et al.
Ann. of Phys.
(1979)
W. Weise
Nucl. Phys.
(1977)
K. Klingenbeck et al.
Phys. Rev. Lett.
(1978)
E. Hayward et al.
Nucl. Phys.
(1984)
H. Arenhövel et al.
Phys. Lett.
(1985)
N. Ohtsuka, in...
Y. Horikawa et al.
Nucl. Phys.
(1980)

There are more references available in the full text version of this article.

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The elastic and inelastic photon scattering from ¹²C was investigated in the energy range of the Δ-resonance (E_γ = 200–500 MeV) at a scattering angle of 40°. The experiment was performed with the tagged photon facility at the cw electron accelerator MAMI (E_e− = 855 MeV). By using a large NaI(Tl) detector having an energy resolution of 1.5%, the elastic scattering could be separated from the inelastic process to the first excited state (E_x = 4.44 MeV of ¹²C. The differential cross section for the coherent scattering is compared with a simple static ansatz, that uses the known charge form factor, and with a recent Δ-hole calculation.
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1993, Nuclear Physics, Section A
Nuclear photon scattering
1993, Radiation Physics and Chemistry

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Elastic and inelastic photon scattering on 12C and 16O in the Δ-resonance region☆

Abstract

Ann. of Phys.

Ann. of Phys.

Ann. of Phys.

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Phys. Rev. Lett.

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Elastic and inelastic photon scattering on ¹²C and ¹⁶O in the Δ-resonance region☆