Tests of microscopic calculations of multiple band structures and large deformations in ${}^{68}{Ge}$ and ${}^{72}{Se}$

High-spin states in

{}^{68}{Ge}

and

{}^{72}{Se}

have been studied by in-beam, gamma-ray spectroscopy. In

{}^{68}{Ge}

the three known bands beginning at

8^{+}

are found to exhibit crossing transitions and other new positive-parity bands are discovered to feed into them. In

{}^{72}{Se}

only a single positive-parity yrast band is seen to high spin. Detailed, more realistic microscopic model calculations have been carried out for

{}^{68}{Ge}

and

{}^{72}{Se}

. There is striking agreement between the calculations and the new data for

{}^{68}{Ge}

, including a predicted new band with superdeformation, β∼0.42. The calculations for

{}^{72}{Se}

predict similar multiple band structures that are not seen experimentally.

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Tests of microscopic calculations of multiple band structures and large deformations inGe68andSe72