High-spin structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>139</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>
Annotatsiya
The $_{\mathrm{}63}^{139}\mathrm{Eu}_{76}$ nucleus has been investigated by \ensuremath{\gamma}-\ensuremath{\gamma} coincidence measurements employing the $^{92}\mathrm{Mo}$${(}^{50}$Cr,3p) reaction at 220 MeV with both backed and thin self-supporting targets. The high-spin properties have been followed up to a spin of 47/2. The \ensuremath{\pi}${\mathit{h}}_{11/2}$ yrast band and its unfavored signature partner both exhibit backbends due to ${\mathit{h}}_{11/2}$ proton alignment. The two signatures of a \ensuremath{\pi}${\mathit{g}}_{7/2}$(${\mathit{d}}_{5/2}$) band above the ${\mathit{h}}_{11/2}$ proton alignment were also identified. Interpretations of other structures are discussed.
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