The experimentally observed delta I = 1 doublet bands in some odd-odd nuclei are analyzed within the orthosymplectic extensiou of the interacting vector boson model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. It is illustrated by its application to three odd-oddnuclei from the A ~ 130 region, namely 126Pr, 134Pr, and 132La. The theoretical predictions for the energy levels of the doublet bands as well as E2 and M 1 transition probabilities between the states of the yrast band in the last two nuclei are compared with experiment and the results of other theoretical approaches. The obtained results reveal the applicability 01 the orthosymplectic extension of the IVBM.
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