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Using a shell model which is capable of describing the spectra of upper$g_{9/2}$-shell nuclei close to the $N=Z$ line, we study the structure of twoisomeric states $7^{+}$ and $21^{+}$ in the odd-odd $N=Z$ nucleus $^{94}$Ag. Itis found that both isomeric states exhibit a large collectivity. The $7^{+}$state is oblately deformed, and is suggested to be a shape isomer in nature.The $21^{+}$ state becomes isomeric because of level inversion of the $19^{+}$and $21^{+}$ states due to core excitations across the $N=Z=50$ shell gap.Calculation of spectroscopic quadrupole moment indicates clearly an enhancementin these states due to the core excitations. However, the present shell modelcalculation that produces the $19^{+}$-$21^{+}$ level inversion cannot acceptthe large-deformation picture of Mukha {\it et al.} in Nature {\bf 439}, 298(2006).Comment: 10 pages, 14 figures, accepted for publication in Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

Structure of upper-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>g</mml:mi><mml:mrow><mml:mn>9</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-shell nuclei and shape effect in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ag</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>94</mml:mn></mml:mrow></mml:mmultiscripts…

Structure of upper-g9/2-shell nuclei and shape effect in theAg94