Positron sources for atomic physics experiments

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Abstract
The authors have demonstrated the possibility of producing strong and point-like positron sources by collection of the ion beams from an on-line mass separator. At ISOLDE beta + emission rates of 3.7*109 Bq were obtained from 81Rb sources collected on an area smaller than 4.5 mm2. When the activity is deposited on a transmission moderator, low-energy positron beams with high brightness can be produced. With a 6 mu m thick polycrystalline tungsten transmission moderator a brightness per energy of better than 800 s-1 mm-2 rad-2 eV-1 was achieved. This value could still be considerably increased by optimisation of the ion beam parameters and by means of a more efficient moderator.

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