LOW-LYING E1 AND M1 STRENGTHS IN THE DEFORMED NUCLEUS GD-160

Measurements of the linear polarization of resonantly scattered photons have been used for model-independent parity determinations in nuclear resonance fluorescence experiments. The experiments have been performed at the bremsstrahlung facility of the Stuttgart Dynamitron accelerator. The use of two different Compton polarimeters, a five Ge-detector arrangement and a sectored single-crystal Ge-polarimeter enabled the parity assignments. Positive parities were established for a cluster of states near 3.3 MeV (M1 transitions) to be ascribed to the so-called scissors mode. In addition an enhanced electric dipole excitation near 2.5 MeV (2471 keV, B(E1)up arrow = 3.0+/-0.4 x 10(-3) e(2)fm(2)) has been observed as in the neighbouring isotopes Dy-162 and Nd-150. These 1(-) states systematically exhibit an uncommon decay branching hinting at K-mixing.