Follow-Ups on Great Achievements: New MRTOF-MS Projects at RIKEN-RIBF

The exotic isotopes of 249-253Md [1] and many other rare species like 210-214Ac/Ra [2] and intermediate-mass nuclei [3] and about 70 other isotopes have successfully been measured using a multi-reflection time-of-flight spectrograph (MRTOF-MS) at the super-heavy element (SHE)-mass facility of RIKEN-KEK [4]. After successful completion of the first SHE-Mass campaign, the setup has been redesigned for higher efficiencies. It has been relocated (with GARIS-II) to be behind the RRC accelerator with the new aim to measure the masses of 284Nh and 288Mc. Further MRTOF-MS devices are being developed to perform mass measurements of the most exotic species produced at RIKEN and will be placed in various locations as behind RIKEN's zero-degree spectrometer for symbiotic operation with other experiments. In this contribution, an overview of the future plans for low-energy precision mass measurements will be provided.

[1] Y. Ito et al., Phys. Rev. Lett. 120, 102501 (2018)
[2] M. Rosenbusch et al., Phys. Rev. C 97, 064306 (2018)

[3] S. Kimura et al., IJMS 430, 134 (2018)
[4] P. Schury et al., Nucl. Instr. Meth. B 335, 39 (2014)