Abstract

We developed KEK Isotope Separation System (KISS) in RIKEN Nishina center to produce neutron-rich isotopes around N = 126 for the study of β-decay properties from astrophysical interests. The KISS is an argon-gas-cell-based on laser ion source with ISOL, and, therefore, allows us to extract heavy refractory elements and investigate neutron-rich isotopes around N = 126. We extracted the laser-ionized unstable nuclei in the vicinity of 198Pt, and performed β-γ spectroscopy and in-gas-cell laser ionization spectroscopy successfully.

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