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

Direct mass measurements of neutron-deficient nuclides around the N=50 shell closure below 100Sn were performed at FRS Ion Catcher (FRS-IC) GSI, Germany. The nuclei produced by projectile fragmentation 124Xe, separated in fragment separator and delivered to FRS-IC. masses 14 ground states two isomers measured with relative uncertainties down 1×10−7 using multiple-reflection time-of-flight spectrometer FRS-IC, including first direct 98Cd 97Rh. A new QEC=5437±67 keV was obtained for 98Cd, resulting a summed Gamow-Teller (GT) strength five observed transitions (0+⟶1+) as B(GT)=2.94−0.28+0.32. Investigation this result state-of-the-art model approaches accounting time experimentally spectrum GT points perfect agreement isotones. excitation energy long-lived isomeric state 94Rh determined be 293±21 keV. This, together calculations, allows level ordering understood.