Instrumentation for the McGill collinear laser system

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Laser spectroscopic techniques are among the most precise for measuring the sizes, shapes and nuclear moments of atomic nuclei. Collinear laser spectroscopy is one of the most sensitive and versatile of the methods used for measurements of radioactive nuclei produced in reactions at particle accelerator facilities. In this technique, a fast beam of ions is superimposed with a laser's light beam, so the traveling ion beam itself is effectively the target in the experiment. Tuning the laser beam's light frequency, or varying the speed of the ions sweeps the beam through atomic resonances which produce observable fluorescence in an interaction region; analysis of these resonances permits us to deduce the radius and shape changes of the nuclei involved. We have constructed such a facility at TRIUMF to take advantage of the very intense beams available at the ISAC mass separator, and in a collaboration with TRIUMF, Texas A & M, UWO and Calgary we have carried out the first measurements with this system.