Absolute gamma intensities in theA=98transitional nuclei and shape coexistence inY98

Absolute gamma intensities have been measured for the strong transitions in the decay chain ${}_{}{}^{98}{}_{}{}^{}\mathrm{Rb}$→ ${}_{}{}^{98}{}_{}{}^{}\mathrm{Sr}$→ ${}_{}{}^{98}{}_{}{}^{}\mathrm{Y}$→ ${}_{}{}^{98}{}_{}{}^{}\mathrm{Zr}$ and ${}_{}{}^{98}{}_{}{}^{}\mathrm{Nb}$→ ${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}$ and found approximately four times higher than those currently adopted. As a consequence, several contradictions in this critical chain of nuclei are resolved. Shape coexistance is established in ${}_{}{}^{98}{}_{}{}^{}\mathrm{Y}$ with a $J^{\pi }=1^{-}$ "spherical" ground state and with a previously reported deformed band with band head at 495.7 keV.