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

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Abstract

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.

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