An ion trap for nuclear laser spectroscopy at Tohoku ISOL

Abstract An on-line ion trap directly connected to the Tohoku ISOL has been constructed. The trap is aimed at the study of nuclear magnetic properties through precision measurements of ionic ground-state hyperfine structures of unstable nuclei. As a first step to a systematic study, the hyperfine splitting of the ground state of 87 Sr + ions was measured by laser microwave double-resonance spectroscopy.