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Direct mass measurements of neutron-deficient nuclides around the $N=50$shell closure below $^{100}$Sn were performed at the FRS Ion Catcher (FRS-IC)at GSI, Germany. The nuclei were produced by projectile fragmentation of$^{124}$Xe, separated in the fragment separator FRS and delivered to theFRS-IC. The masses of 14 ground states and two isomers were measured withrelative mass uncertainties down to $1\times 10^{-7}$ using themultiple-reflection time-of-flight mass spectrometer of the FRS-IC, includingthe first direct mass measurements of $^{98}$Cd and $^{97}$Rh. A new$Q_\mathrm{EC} = 5437\pm67$ keV was obtained for $^{98}$Cd, resulting in asummed Gamow-Teller (GT) strength for the five observed transitions($0^+\longrightarrow1^+$) as $B(\text{GT})=2.94^{+0.32}_{-0.28}$. Investigationof this result in state-of-the-art shell model approaches sheds light into abetter understanding of the GT transitions in even-even isotones at $N=50$. Theexcitation energy of the long-lived isomeric state in $^{94}$Rh was determinedfor the first time to be $293\pm 21$ keV. This, together with the shell modelcalculations, allows the level ordering in $^{94}$Rh to be understood.

Studying Gamow-Teller transitions and the assignment of isomeric and ground states at $N=50$