[en] Lifetime measurements were performed for transitions in the decoupled bands based on the h/sub 11/2/ band-head in /sup 119-123/Xe, /sup 121,123/Cs and ¹¹⁹I using the Recoil Distance Method to study the systematics of reduced transition probabilities (B(E2)'s) as a function of the proton number and the neutron number in the Z > 50 region and to test the validity of various theoretical models. Levels were populated using the /sup 104,106,108/Pd (¹⁹F,p3nγ), /sup 106, 108/Pd(¹⁹F,4nγ); ¹⁰⁴Pd(¹⁹F,2p2nγ); ¹¹⁵In(¹¹B,p3nγ), ¹⁰⁶Pd (¹⁶O,3nγ) and ¹⁰⁶Pd(¹⁶O,p2nγ) reactions on enriched, thin, self supporting, stretched targets. The stoppers were stretched gold foils of appropriate thickness. The systematics of the B(E2)'s obtained both as a function of proton number and the neutron number are presented and compared with the prediction of the Interacting Boson Fermion Model (IBFM) and the Particle plus Triaxial Rotor Model (PTRM) to ascertain the comparative suitability of these models in the this region. Both models appear to reproduce the systematic trends rather well, although distinct differences remain in their predictions for the individual nuclei