The ion-guide isotope separator on-line at the Tohoku University Cyclotron

The status of the ion-guide isotope separator on-line at the Tohoku University Cyclotron is reported. The optimum ion-guide parameters were determined from test experiments using atomic and molecular ions ionized with an electric discharge inside the target chamber as well as using /sup 64/Ga(T/sub 1/2/ = 2.6 M) ions produced by the /sup 64/Zn(p,n) reaction. Using the present system together with a ΔE - E plastic counter telescope and a germanium detector they identified 16 short-lived nuclei including the first mass-separated nuclei /sup 57/Cu and /sup 45/V. The efficiency of mass separation for /sup 64/Ga was ε -- 1%, where ε is defined as the number of atoms collected at the end of the separator divided by that recoiling from the target. Application of IGISOL to nuclear physics is being performed for nuclei in the f/sub 7/2-rho3/2/ shell regions and medium-mass neutron-rich unclei produced by the proton-induced fission reaction with a uranium target