Abstract
A focussing atomic-beam magnetic resonance (ABMR) apparatus has been constructed. The apparatus utilizes a sixpole A-magnet and a fourpole B-magnet, a construction which combines a high transmission with a small collector area. Being intended mainly for work on elements difficult to deflect, i.e. those with high evaporation temperature or small atomic g-value, the ratio of length to radius has been chosen relatively large. An oven construction particularly suitable for high-temperature work is described. The atomic-beam apparatus is equipped with internal detectors for “on-line” detection of short-lived activities. This system has been used in spin-measurements of nuclei with half- lives as short as two minutes.
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