Identification of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">T</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>0</mml:mn><mml:mn/></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">T</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1</mml:mn><mml:mn/></mml:math>Bands in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">N</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mi mathvariant="italic">Z</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>37</mml:mn><mml:mn/></mml:math>Nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>74</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Rb

The $\ensuremath{\gamma}$ decay of excited states in the $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}Z$ odd-odd nucleus ${}^{74}\mathrm{Rb}$ has been observed for the first time. The reaction ${}^{40}\mathrm{Ca}{(}^{40}\mathrm{Ca},\ensuremath{\alpha}\mathrm{pn}{)}^{74}\mathrm{Rb}$ at 128 MeV beam energy was used. The ground state rotational band can be interpreted as being formed from the $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ isobaric analog states of ${}^{74}\mathrm{Kr}$ with pairing correlations based on $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$, ${M}_{T}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ neutron-proton pairs. At higher rotational frequency, a $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ rotational band becomes energetically favored over the $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ ground state band, in agreement with the predictions of cranked shell model calculations which explicitly include $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ and $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ pairs.