Preparation of cooled and bunched ion beams at ISOLDE-CERN

At ISOLDE a new RadioFrequency Quadrupole ion Cooler and Buncher (RFQCB) is being constructed to improve ion optical properties of low-energy RIBs. The new features of the mechanical design and the status of the test bench, which will serve to test the device, will be presented in this contribution

The PS on-line mass spectrometer dedicated to the study of the exotic light nuclei

The experiments performed with the PS on-line mass spectrometer: atomic hyperfine structure determinations and nuclear spectroscopy of Li, Na and K isotopes require high efficiency and as low as possible radioactive background in the area of the detectors. A view of the lay-out will be given concerning in particular the very thick iron and concrete shielding and the mass separated ion beam line going through the shielding from the mass spectrometer to the detector room. This device is an L-shaped pipe with electrostatic focusing elements. The background correlated with the proton beam pulse is lower than the sensitivity of the γ detector and the neutron flux is less than 1 n/cm2s. Slow rate events, corresponding to nuclei far from the stability, such as 34Na, are recorded with a good signal-to-noise ratio

Mistral: a new program for precise atomic mass determinations of nuclides far from stability

The MISTRAL project (Mass measurements at ISolde using a Transmission RAdiofrequency spectrometer on-Line) is scheduled to begin experiments towards the end of 1996. With high resolution (105), potentially high accuracy (5×10–7) and excellent sensitivity (10 s–1), the MISTRAL spectrometer promises to provide needed mass measurements in regions of very-short lived nuclei. The spectrometer operation principles are described and a discussion concerning the interest in using highly charged ions is presented