We have developed the KEK Isotope Separation System (KISS) [1] at RIKEN to study the nuclear structure of the nuclei in the vicinity of neutron magic number N = 126 and 152 from the astrophysical interest. These neutron-rich nuclei have been produced by using multinucleon transfer reactions [2] with the combinations of the low-energy 136Xe/238U beams and the production targets of W, Ir, and Pt. At the KISS facility, these radioisotopes are ionized by applying in-gas-cell resonant laser ionization technique. In the ionization process, we can perform laser ionization spectroscopy of the refractory elements with the atomic number Z = 72-78. Ionized unstable nuclei are transported to beta-gamma decay station [3] for half-life measurements or MRTOF-MS [4] for precise mass measurements.
In the talk, we will introduce the KISS facility, report the recent experimental results, and the perspective of future plan at KISS.

References
[1] Y. Hirayama et al., Nucl. Inst. Meth. B353, 4 (2015), and B412, 11 (2017).
[2] Y.X. Watanabe et al., Phys. Rev. Lett. 172503, 1 (2015).
[3] M. Mukai et al., Nucl. Inst. Meth. A884, 1 (2018), Y. Hirayama et al., NIMA997, 165152 (2021).
[4] P. Schury et al., Nucl. Inst. Meth. B317, 537 (2013).