Abstract
The 100\% polarized photon beam at the high intensity gamma ray source
(HI gamma S) at Duke University has been used to determine the parity of
six dipole excitations between 2.9 and 3.6 MeV in the deformed nuclei
Yb-172,Yb-174 in photon scattering ((gamma) over right arrowy')
experiments. The measured parities are compared with previous
assignments based on the K quantum number that had been assigned in
nuclear resonance fluorescence (NRF) experiments by using the Alaga
rules. A systematic survey of the relation between gamma-decay branching
ratios and parity quantum numbers is given for the rare earth nuclei.
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