Abstract
The data from numerous high resolution photon scattering experiments
allow an extensive survey of the lowest electric dipole excitations in
the A similar or equal to 130-200 mass region. In this mass region one
can find spherical as well as transitional and strongly quadrupole
deformed nuclei. The measured absolute EI strengths are typically of the
order of several milli Weisskopf units and exhibit in general a smooth
variation with mass number.
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