SCISSORS STATES WITH AND WITHOUT G-BOSONS IN THE INTERACTING BOSON FERMION MODEL FOR EVEN ODD NUCLEI IN THE N = 82-126 SHELL

The M1 excited scissors states for even-odd nuclei in the N = 82-126 shell are studied, with W-185 as the example, in the SU(3) limit of the proton-neutron interacting boson-fermion model with sd- and sgd-bosons. The sd-results are recovered as a special case of the sdg-model; the latter model admits two different (SU(3) x U(2) and U(15) x U(2)) coupling schemes and the M1-operator in this limit has two pieces (that behave as (11) and (33) SU(3) tensors), unlike one each in the sd-case. The scissors M1-states in the SU(3) x U(2) and U(15) x U(2) limits are classified and the location of these states and the corresponding B(M1) values are predicted for the SU(3) x U(2) limit. The results given for W-185 are directly applicable for the nuclei Os-187, Os-189. Results for other even-odd nuclei in the N = 82-126 shell are also given.