Elsevier

Nuclear Physics A

Volume 579, Issues 3–4, 24 October 1994, Pages 453-471
Nuclear Physics A

Suppression of nucleon resonances in the total photoabsorption on nuclei

https://doi.org/10.1016/0375-9474(94)90918-0Get rights and content

Abstract

We analyze the recent nuclear-photoabsorption data which have shown the disappearance on nuclei of the resonances higher than the Δ. We discuss how the Fermi motion, the collision broadening, and the Pauli blocking might distort the shape of nucleon resonances in the nuclear medium, and show that the Fermi motion and the collision broadening play the major role. From a fit to the photoabsorption data on uranium we have estimated the total cross sections for scattering of the resonances P33(1232), D13(1520), F15(1680), and D33(1700) on nucleons. The estimate for the P33-resonance cross section is in fair agreement with the value derived from the NN → ΔN cross sections, while those for the other resonances are high although do not violate the unitary limits.

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    Permanent address: Institute of Theoretical and Experimental Physics, Moscow 117 Russia.

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