Ponente
Descripción
DESPEC experiments aim at a detailed study of the decay mechanisms in the most exotic nuclear species at reach at GSI/FAIR, with the measurements of decay half-lives, competing decay modes, and isomeric state identification. For the DESPEC experimental program, ions will be stopped in an active implanter and their subsequent decays will be measured. The active implanter’s role is to stop the nuclides produced by the FRS/Super-FRS, provide their respective implantation times and positions, detect the times and positions of subsequent β or α decays, and provide rough energy information to distinguish the decay processes. Particularly for fast-timing experiments, an implantation detector is needed with a time resolution better than 1ns and the capability to detect and distinguish between ion implantations and subsequent decays. The fundamental idea of Fibre IMPlanter (FIMP) is to replace the DSSSD-s array with scintillating fibres. Such fibres made from polystyrene-based scintillation materials in thin PMMA cladding are available and can be read out by SiPMs. The FIMP consists of layers of orthogonally running fibre mats. The design is based on the assumption that β and α particles and the associated secondary electrons will hit at least one fibre in each of two consecutive layers so that complete position information is available. The first small-scale FIMP prototype with custom front-end readout electronics and a mechanical construction paradigm suitable for scaling up to the planned full size has been constructed and recently tested in beam in GSI. The preliminary results as well as future plans and outlook will be presented.
