Precision hyperfine structure spectroscopy of Be isotopes at SLOWRI prototype and prospects of SLOWRI at RIKEN

Precision atomic spectroscopy experiments for Be isotopes have been carried out at the prototype universal slow RI‐beam (SLOWRI) setup at RIKEN. Radioactive Be ions produced at 1 GeV were decelerated and thermlized in an RF‐carpet ion guide. The thermalized ions were transferred to an ion trap where laser cooling was used to reduce the ion energy to the order of $\text{1\hspace{0.17em}μ}\mathrm{eV}.$ Laser microwave double resonance spectroscopy was performed for the hyperfine structure measurements of trapped and laser cooled ${}^7{\mathrm{Be}}^{+}$ and ${}^{11}{\mathrm{Be}}^{+}$ ions. Measurements of the $S_{\text{1/2}}{\mathrm{\to P}}_{\text{1/2}}{\mathrm{,P}}_{\text{3/2}}$ transition frequencies of ${}^{\text{7,9,10,11}}{\mathrm{Be}}^{+}$ ions are also in progress. These results are briefly discussed. Future prospects for expanding the capability of SLOWRI is also discussed.