Compton Scattering on the Proton and Light Nuclei in the Δ-Resonance Region

O. Scholten, S. Kondratyuk

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Microscopic calculations of Compton scattering on the free proton and light nuclei are presented. For the description of Compton scattering on the proton the conventional K-matrix approach and the ``Dressed K-Matrix'' model are introduced. The latter approach can be used to calculate polarizabilities as well as Compton scattering for photon energies upto 1 GeV since it obeys the symmetry properties which are appropriate in the different energy regions. In particular, crossing symmetry, gauge invariance and unitarity are satisfied. The extent of violation of analyticity (causality) is used as an expansion parameter. Coherent Compton scattering on light nuclei at 200--300 MeV is studied in the impulse approximation and is shown to be a sensitive probe of the in-medium properties of the Δ -resonance. Modifications of the properties of the Δ-resonance due to the nuclear medium are accounted for through the self-energy operator of the Δ. The dominant medium effects such as the Pauli blocking effects in the decay width, effective nucleon mass and particle--hole excitations in the pion propagator are consistently included in nuclear matter.
Original languageEnglish
Title of host publicationProceedings of the International Symposium
Subtitle of host publicationElectromagnetic Interactions in Nuclear and Hadron Physics
EditorsMamoru Fujiwara, Tatsushi Shima
PublisherWorld Scientific Publishing
Number of pages12
ISBN (Print)9789812777218
Publication statusPublished - Jun-2002
EventInternational Symposium on Electromagnetic Interactions in Nuclear and Hadron Physics - , Japan
Duration: 4-Dec-20017-Dec-2001


OtherInternational Symposium on Electromagnetic Interactions in Nuclear and Hadron Physics

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