We describe the production of francium beams from the fusion-evaporation reaction 197 Au(18O; kn) 215-k Fr generated by a ~100 MeV 18O6+ beam on a thick gold target. The physics of the production process is discussed, together with estimates of expected production rates. The production target is heated to ~1200 K and kept at a potential of +3 kV to enhance Fr diffusion and surface desorption, and to accelerate surface-ionized ions. Details are given on its design and construction. The performance of the target is measured as a function of primary beam energy and flux, target temperature and extraction voltage. Average production rates are 0.7 x 10^6 ions/s for 210 Fr with a primary beam flux of 10^12 particles/s, with peaks of 2 x 10^6 ions/s. From these measurements, information on the efficiency of the release processes is inferred.

Production of radioactive beams of francium

ATOUTOV, Serguei;CALABRESE, Roberto;TOMASSETTI, Luca
2006

Abstract

We describe the production of francium beams from the fusion-evaporation reaction 197 Au(18O; kn) 215-k Fr generated by a ~100 MeV 18O6+ beam on a thick gold target. The physics of the production process is discussed, together with estimates of expected production rates. The production target is heated to ~1200 K and kept at a potential of +3 kV to enhance Fr diffusion and surface desorption, and to accelerate surface-ionized ions. Details are given on its design and construction. The performance of the target is measured as a function of primary beam energy and flux, target temperature and extraction voltage. Average production rates are 0.7 x 10^6 ions/s for 210 Fr with a primary beam flux of 10^12 particles/s, with peaks of 2 x 10^6 ions/s. From these measurements, information on the efficiency of the release processes is inferred.
2006
Stancari, G.; Veronesi, S.; Corradi, L.; Atoutov, Serguei; Calabrese, Roberto; Dainelli, A.; Mariotti, E.; Moi, L.; Sanguinetti, S.; Tomassetti, Luca
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516589
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