An Electron Pair Spectrometer of Lens Type for Hard Gamma-Radiation

Abstract
A new type of pair spectrometer is described. The rotation of the image in a short magnetic lens is used to separate negatrons and positrons by putting the pair converter a little aside from the optical axis of the lens. It is then possible to obtain coincidence ``lines.'' The apparatus has been tried on the 2.62‐Mev γ‐ray of ThC″ and the 2.76‐Mev γ‐ray of Na24.

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