Abstract
Based on an analysis of all available experimental data on photonuclear cross sections and properties of the ground and low-lying states of nuclei, the main factors that determine the width of the giant dipole resonance (GDR) are established for nuclei with the number of nucleons A ≥ 40. It is shown that for nuclei with A >120, the main reason for the increase in the GDR’s width in comparison to the magic value (4–5 MeV) is the the deviation of the nuclear shape from spherical (the Danos-Okamoto effect). The main factor behind the increase in the GDR’s width for nuclei with A from 40 to 120 relative to the magic value is dipole-quadrupole friction, i.e., the decay of the doorway dipole states into states of more complex nature, due to the coupling of the doorway states to quadrupole vibrations of the nuclear surface.
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Original Russian Text © I.M. Kapitonov, 2015, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2015, Vol. 79, No. 4, pp. 569–574.
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Kapitonov, I.M. Width of the giant dipole resonance in medium and heavy nuclei. Bull. Russ. Acad. Sci. Phys. 79, 526–531 (2015). https://doi.org/10.3103/S1062873815040188
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DOI: https://doi.org/10.3103/S1062873815040188