Present and future of the Rare-RI Ring Facility at RIBF*

Abstract An overview of the storage ring facility called Rare-RI Ring (R3) at the RI Beam Factory (RIBF), RIKEN is provided herein. The primary objective is obtaining precision atomic masses to understand astrophysical nucleosynthesis. The R3 is located downstream of the fragment separator BigRIPS in the OEDO-SHARAQ branch. Randomly produced radioactive ions are individually identified using auxiliary detectors at BigRIPS. Only a single ion of interest is injected into the R3 using the dedicated fast kicker system and ejected after thousands of revolutions in an event-by-event scheme. Revolution times under the isochronous ion-optical condition provide the mass-to-charge ratios of stored ions. Several commissioning campaigns, physics programs, and technical upgrades are summarized. In addition to mass measurements of exotic nuclei, future perspectives of new experimental opportunities are addressed.