A comparative measurement of the transition quadrupole moments of the yrast superdeformed bands in ~(80-88)Sr, ~(83)Y, ~(84)Zr has been performed using the Doppler-shift attenuation method. Thus, we have accurately measured the relative deformations of these structures, establishing for the first time, clear trends in the deformations of these bands. The yrast SD bands in the ~(80-83)Sr isotopes are shown to possess similar transition quadrupole moments, while significantly larger values are obtained for the ~(83)Y and ~(84)Zr cases. These results provide a stringent evaluation of the intruder orbital assignments of these structures, suggesting new assignments in some of these cases.
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