The enhancement of giant-dipole strength and its consequences for the effective mass of the nucleon and the electromagnetic polarizabilities and quadrupole sum-rule of the nucleus - INSPIRE

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The enhancement of giant-dipole strength and its consequences for the effective mass of the nucleon and the electromagnetic polarizabilities and quadrupole sum-rule of the nucleus

Martin Schumacher

1994

22 pages

Published in:

Nucl.Phys.A 576 (1994) 603-625

DOI:

10.1016/0375-9474(94)90746-3

View in:

Nuclear Science References

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Abstract: (Elsevier)

Using recent experimental results on Compton scattering by 208 Pb at energies below pion threshold we explore the effects of enhancement due to mesonic currents and isovector vibrations on the giant resonances of nuclei. Quantitative information is given for the enhancements of the electric polarizability, the diamagnetic susceptibility and the energy-weighted quadrupole sum rule. It is shown that the average of results available from different laboratories on the “nonretarded” enhancement constant K GDR in the A = 197–209 mass range favours an effective nucleon mass of m ∗ m = 3 4 . Some new results for the amplitude of Compton scattering by the giant resonances of nuclei are presented which allow a treatment of the retardation problem in a zero-order approximation.

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