Absolute Assay and Study of Short-Lived Radionuclides by a Recoil Technique

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Abstract
A new type of accelerator target has been used to determine the yield of He6 from high‐energy nuclear reactions. In this target the nuclear recoil of the product isotope separates it from the target material and carries it into a ``catcher'' gas which is then swept into a counter. Because of the design principle employed in this target, the data can be translated directly into absolute cross sections without explicit knowledge of the recoil properties of the product. This type of system may also prove useful in the determination of (1) the relative stopping powers of gases, (2) the rate of thermal diffusion of product species through the target material, and (3) the chemical properties of short‐lived species of large kinetic energy.