Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP Kaleja, O. Gutiérrez, M. J. Rodríguez Rubiales, Daniel Direct mass measurements in the region of the heaviest elements were performed with the Penning-trap mass spectrometer SHIPTRAP at GSI Darmstadt. Utilizing the phase-imaging ion-cyclotron-resonance massspectrometry technique, the atomic masses of 251No (Z = 102), 254Lr (Z = 103), and 257Rf (Z = 104) available at rates down to one detected ion per day were determined directly for the first time. The ground-state masses of 254No and 255,256Lr were improved by more than one order of magnitude. Relative statistical uncertainties as low as δm/m ≈ 10−9 were achieved. Mass resolving powers of 11 000 000 allowed resolving long-lived low-lying isomeric states from their respective ground states in 251,254No and 254,255Lr. This provided an unambiguous determination of the binding energies for odd-A and odd-odd nuclides previously determined only indirectly from decay spectroscopy. 2023-01-18T07:52:06Z 2023-01-18T07:52:06Z 2022-11-29 journal article Kaleja, O... [et al.] (2022). Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP. Physical Review C, 106(5), 054325. DOI: [10.1103/PhysRevC.106.054325] https://hdl.handle.net/10481/79072 10.1103/PhysRevC.106.054325 eng info:eu-repo/grantAgreement/EC/FP7/819957 http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI