Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP
Abstract
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 mass-spectrometry 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 Lr,256255 were improved by more than one order of magnitude. Relative statistical uncertainties as low as δ m /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 No,254251 and Lr,255254. This provided an unambiguous determination of the binding energies for odd-A and odd-odd nuclides previously determined only indirectly from decay spectroscopy.
- Publication:
-
Physical Review C
- Pub Date:
- November 2022
- DOI:
- 10.1103/PhysRevC.106.054325
- Bibcode:
- 2022PhRvC.106e4325K