The mass programme at GANIL using the CSS2 and CIME cyclotrons

The mass-measurement programme at GANIL aims to measure the masses of heavy nuclei close to the N=Z line which is the ideal region to study neutron-pr oton pairing. An original direct time-of-flight mass-measurement method was developed at GANIL which uses the CSS2 cyclotron as a high-resolution spec trometer. The masses of ions of A = 68, 76, 80 and 100 have been measured w ith a precision of a few 10(-6). Mass measurements will be performed with t he new CME cyclotron of SPIRAL using a similar method based on the measurem ent of the phase of the accelerated ions for different radio-frequencies. A recently approved experiment will help develop this new technique and aims to measure the mass of Ar-31 radioactive nuclei with a. precision of 10(-6 ) .