Instrumentation for the McGill collinear laser system

激光光谱技术是测量原子核大小、形状和核矩最精确的技术之一。共线激光光谱学是用于测量粒子加速器设施中反应产生的放射性核的最灵敏和最通用的方法之一。在这项技术中，快速离子束与激光光束叠加，因此行进的离子束本身就是实验中的有效目标。调整激光束的光频率，或改变离子的速度，使激光束通过原子共振，在相互作用区域产生可观察到的荧光；对这些共振的分析使我们能够推断出所涉及的原子核的半径和形状变化。我们在TRIUMF建造了这样一个设施，以利用ISAC质量分离器提供的非常强的光束，并与TRIUMF，德克萨斯州a&m， UWO和卡尔加里合作，我们使用该系统进行了第一次测量。

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.