Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP

Kaleja, O.; Andelic, B.; Bezrodnova, O.; Blaum, K.; Block, M.; Chenmarev, S.; Chhetri, P.; Droese, C.; Duellmann, Ch E.; Eibach, M.; Eliseev, S.; Even, J.; Filianin, P.; Giacoppo, F.; Goetz, S.; Gusev, Yu; Gutierrez, M. J.; Hessberger, F. P.; Kalantar-Nayestanaki, N.; Laar, J. J. W. van de; Laatiaoui, M.; Lohse, S.; Martynova, N.; Ramirez, E. Minaya; Mistry, A. K.; Murboeck, T.; Novikov, Yu; Raeder, S.; Rodriguez, D.; Schneider, F.; Schweikhard, L.; Thirolf, P. G. and Yakushev, A. (2022): Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP. In: Physical Review C, Vol. 106, No. 5, 54325

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 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 delta m/m approximate to 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.

• Item Type: Journal article
• Faculties: Physics
• Subjects: 500 Science > 530 Physics
• ISSN: 2469-9985
• Language: English