Optimization of the recoil-direction-sensitive target for muon capture

The optimal thickness of layers composing nucleus-recoil-sensitive target that enables the measurement of a particular orientation parameter of the final nuclei 12Bgs(I = 1+) and 16Ngs(I = 2−) in the reactions μ− + 12C(0+) → vμ + 12Bgs(I = 1+) and μ− + 16O(0+) → vμ + 16Ngs(I = 2−) is estimated according to the current status of art of the slowing down of low energy (recoil energy of 12B is 376 keV and that of 16N is 300 keV) charged particles in matter. The choice of materials for orientation preserving (Ni, Ag, Rh) and for orientation-destroying (Al) layers which sandwich the production target layer C or BeO is based on the data obtained with polarized 12B and 13N radioactive nuclei beams at the Université Catholique de Louvain.