Abstract
The photon-decay modes of the giant dipole resonance (gdr) in the nuclei $^{142,146,148,150}\mathrm{Nd}$ were investigated via elastic and inelastic photon scattering. Considerable inelastic scattering was seen into the first excited state of each nucleus. In $^{148}\mathrm{Nd}$ and $^{150}\mathrm{Nd}$, scattering into several higher levels was also resolved and found to be quite weak. The data are interpreted in the context of both the dynamic collective model and interacting boson model. In these models, the photon decays of the gdr to excited states are a consequence of the coupling between the giant resonance and collective surface degrees of freedom, such as rotations and vibrations. The present data provide the first experimental test of the photon-decay predictions of these models across an entire transitional chain. Both models give an excellent account of the data.
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