M1 transitions between superdeformed states in ^{194, 195}Tl: The fingerprint of the i_13/2 proton intruder orbital

Recent data from the EUROGAM array have revealed dipole transitions linking signature partner superdeformed bands in Tl-194 and Tl-195 nuclei. Measurements of the decay branching ratios, taken together with the average quadrupole moment of the neighboring superdeformed nuclei, enable the absolute M1 strengths to be determined. From these data and using the strong coupling model, we find that two SD bands in Tl-195 are due to the 81st proton being in the [642]5/2(+) orbital and four from the six SD bands in Tl-194 correspond to a configuration where the intrinsic spins of the single proton and single neutron are aligned.