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Elementary nuclear excitations studied with electromagnetic and Hadronic probes

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Response of the Nuclear System to External Forces

Part of the book series: Lecture Notes in Physics ((LNP,volume 441))

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Abstract

In three lectures recent developments in the field of elementary electric and magnetic nuclear excitations are discussed by using electromagnetic probes of different selectivity. The first lecture, after a brief reminder of the features of electron and photon scattering at low energy, deals with two selected examples of electric transitions studied in inclusive and exclusive electron and proton scattering in 12C and 40Ca respectively, i.e. the features of an isospin forbidden electric dipole transition in (e,e′) and the structure of electric giant resonances in (e,e′ x) and (p,p′x) reactions are studied. In the second lecture the nature of the orbital and spin magnetic dipole strength with particular emphasis on the physics of the so-called scissors mode and the spin magnetic dipole giant resonance in heavy deformed nuclei are discussed. The third lecture is concerned with three examples, illuminating how subnuclear effects might be detected in the nuclear electromagnetic response at low energy. For this, the prime case for quenching of magnetic dipole spin-flip strength in 48Ca and the evidence for meson exchange current enhancement of isovector magnetic dipole strength in 24Mg are revisited, and finally as an interesting outlook of the field the role of Δ-isobars in the nuclear wave function is illustrated by looking at the idea and at first results from a recent electroproduction experiment of positively and negatively charged pions on 3He at medium energies.

Work supported by the German Federal Minister for Research and Technology (BMFT) under contract number 06DA641I.

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  1. Institut für Kernphysik, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany

    A. Richter

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Jose Miguel Arias María Isabel Gallardo Manuel Lozano

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Richter, A. (1995). Elementary nuclear excitations studied with electromagnetic and Hadronic probes. In: Arias, J., Gallardo, M., Lozano, M. (eds) Response of the Nuclear System to External Forces. Lecture Notes in Physics, vol 441. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-59007-2_2

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  • DOI: https://doi.org/10.1007/3-540-59007-2_2

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