https://doi.org/10.1140/epja/s10050-024-01414-3
Regular Article - Experimental Physics
Masses of transuranium nuclides measured with the PI-ICR technique at TRIGA-Trap
1
Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117, Heidelberg, Germany
2
Helmholtz-Institut Mainz, Staudingerweg 18, 55128, Mainz, Germany
3
Department Chemie - Standort TRIGA, Johannes Gutenberg-Universität Mainz, Fritz-Strassmann-Weg 2, 55128, Mainz, Germany
4
GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291, Darmstadt, Germany
5
Department of Physics, Istanbul University, 34134, Istanbul, Turkey
6
Universität Greifswald, 17487, Greifswald, Germany
Received:
14
May
2024
Accepted:
2
September
2024
Published online:
10
October
2024
We have revisited the region of the actinides in the vicinity of the neutron number N=152 and conducted high-precision mass measurements using the newly implemented Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique. The masses of 
Pu and 
Cf were found to deviate by 5.4 and 2.9 combined sigmas, respectively, from our previous results published in 2014. This indicates the presence of systematic errors in the earlier measurements. Consequently, we decided to remeasure all the nuclides from our 2014 study, along with 
Cm, to ensure accuracy and reliability. With our greatly improved apparatus, we have measured the masses of Pu, 
Am, 
Am, Cm, and Cf, using 
Pb and 
U as mass references. The masses of these reference ions were recently determined with ultra-high precision at Pentatrap. Our results were implemented in the latest Atomic Mass Evaluation (AME), showing good consistency. The region related to the masses measured in this study, especially for isotopes near the N=152 deformed shell gap, is discussed in terms of two-neutron separation energies, first excited 2
energy levels and their differentials, as well as 
values, the average proton-neutron interaction of the most loosely bound two nucleons.
© The Author(s) 2024
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