Studying Gamow-Teller transitions and the assignment of isomeric and ground states at N=50
Abstract
Direct mass measurements of neutron-deficient nuclides around the N=50 shell closure below 100Sn were performed at the FRS Ion Catcher (FRS-IC) at GSI, Germany. The nuclei were produced by projectile fragmentation of 124Xe, separated in the fragment separator FRS and delivered to the FRS-IC. The masses of 14 ground states and two isomers were measured with relative mass uncertainties down to 1× 10-7 using the multiple-reflection time-of-flight mass spectrometer of the FRS-IC, including the first direct mass measurements of 98Cd and 97Rh. A new QEC = 543767 keV was obtained for 98Cd, resulting in a summed Gamow-Teller (GT) strength for the five observed transitions (0+1+) as B(GT)=2.94+0.32-0.28. Investigation of this result in state-of-the-art shell model approaches sheds light into a better understanding of the GT transitions in even-even isotones at N=50. The excitation energy of the long-lived isomeric state in 94Rh was determined for the first time to be 293 21 keV. This, together with the shell model calculations, allows the level ordering in 94Rh to be understood.
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