The study of the behavior of slow positrons in gases has recently become a very lively field. New fast counting techniques are making it possible to enlarge much further the base already established in earlier work, as well as bringing into practical possibility measurements that previously seemed unattainable. (Typical of the recent experimental systems is the apparatus shown in the photograph, figure 1, and diagrammatically in figure 2.) For collisions with helium atoms at energies below the positronium formation threshold the position appears very well established, and the prospect is now opened for interpreting, in more detail, positron collisions with more complex systems.
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