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Treatment of the Δ current in electromagnetic two-nucleon knockout reactions

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

The contribution of the Δ(1232) isobar to the electromagnetic current of the two-nucleon system and its role in (γ,NN) processes is investigated. The difference between the genuine Δ-excitation current and that part of the current connected to the deexcitation of a preformed Δ in the target nucleus is stressed. The latter cannot lead to a resonant behaviour of matrix elements for energies in the Δ region. The reaction 16O(γ, pp)14C, where the Δ contribution is dominant at intermediate energies, is considered. The large variations found in the cross sections for different treatments stress the need for a proper treatment of the Δ current for a clear understanding of the reaction mechanism of two-nucleon emission processes.

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Authors and Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099, Mainz, Germany

    P. Wilhelm & H. Arenhövel

  2. Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy

    C. Giusti & F. D. Pacati

  3. Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy

    C. Giusti & F. D. Pacati

Authors
  1. P. Wilhelm
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  2. H. Arenhövel
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  3. C. Giusti
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  4. F. D. Pacati
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Wilhelm, P., Arenhövel, H., Giusti, C. et al. Treatment of the Δ current in electromagnetic two-nucleon knockout reactions. Z Phys A - Particles and Fields 359, 467–470 (1997). https://doi.org/10.1007/s002180050428

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  • DOI: https://doi.org/10.1007/s002180050428

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