Orateur
Description
The REPARE ANR project aims at developping a high power targetry to optimize the production of the promising alpha emitter $^{211}$At in the $^{4}$He($^{209}$Bi,2n)$^{211}$At fusion-evaporation reaction. For this, a first task is the precise measurements of several cross-sections to control the production of potential contaminants and to optimize the synthesis of $^{211}$At. Several measurements have been performed and will be presented separately at this colloque. A second task is the design of high power target systems. Two options have been investigated : a solid state $^{209}$Bi target and a liquid target.
For the first option, the goal is to design, build and use a target station able to sustain 10 kW of beam power. In July 2023, the functionalities of the target station (cooling, current measurements, beam synchronization,…) will tested using a $^{20}$Ne beam and a dummy target. If the tests are satisfactory, the REPARE irradiation station will be installed in the NFS converter room in September 2023 for a first $^{211}$At synthesis run.
For the second option, a milestone is a design study to evaluate the feasibility of a liquid target. Several designs have been evaluated using either pure Bi of a Lead Bismuth Eutectic mixture.
Finally an indirect production route is also under investigation. It consists in the production of $^{211}$Rn which beta decays to $^{211}$At. This so-called generator technique has several advantages compared to the direct production one.
In this talk the status of these developments will be discussed and presented in a more general perspective.
