Microsecond mass separation of heavy compound nucleus residues using the Daresbury recoil separator

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Abstract

The recoil separator at the Daresbury Laboratory is described. An efficient charged particle beam transport system is combined with Wien filters to select heavy ions within a small velocity range at angles around 0° which have been produced by heavy ion induced reactions. The system separates and refocusses particles with a given mass to charge (AQ) ratio. Resolution in AQ is 1 in 300. The time taken to determine the atomic mass A and atomic number Z of an individual nucleus passing through the recoil separator is about 10−6 s. This is fast enough for phenomena associated with the compound nucleus decay to be electronically tagged according to the nuclear species produced. An example using γ-ray detectors around the compound nucleus formation target is given.

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