Search

A new direct technique using the CIME cyclotron as a high-resolution mass spectrometer is being developed in order to measure the masses of exotic nuclei. Tests have been performed to check the feasibility of the method with a mixed beam of stable ions extracted from the SPIRAL ion source and injected into the CIME cyclotron. Preliminary results obtained with this new technique are presented and discussed.

The masses of ten neutron-deficient nuclides near the N = Z line with A = 64–80 have been measured with the direct time-of-flight technique using the CSS2 cyclotron as a high-resolution spectrometer. All measured masses agree with the 2003 atomic mass evaluation and are compared to the predictions of the finite range droplet model. The atomic mass excesses obtained for 68Se and 80Y are −53.958(246) MeV and −60.971(180) MeV, respectively. The new results for 68Se and 80Y are compared to other recent experimental values.

In order to study direct reactions of exotic beams on light particles target, we have developed a new detector: MAYA. This detector is an active target, using the gas as target and as a detection material. With such a device, thick target can be used without resolution loss. Furthermore, excitation functions can be studied from the incident beam energy down to the detection threshold with the same setting. This detector uses a multiplexed read-out electronic for the pads of the segmented detection plan. Several experiments have already been performed, providing results about detector characteristics.