Abstract
Photon scattering experiments on the odd, deformed nuclei {sup 161,163}Dy and {sup 157}Gd provided detailed information on the excitation energies and transition probabilities of low-lying dipole excitations. In the case of the even-even nuclei {sup 162,164}Dy in addition spins and parities of the excited states could be determined model independently by measuring the angular distributions and the linear polarization of the scattered photons using a Compton polarimeter. The results are compared with the systematics obtained for the neighboring even-even isotopes {sup 160}Dy and {sup 156,158,160}Gd in previous photon scattering experiments. Whereas in the odd Dy isotopes a concentration of dipole strength is observed, which fits nicely into the systematics of the orbital {ital M}1 mode, the dipole strength in {sup 157}Gd is completely fragmented into about 90 transitions.
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