Quasiparticle trapping in a superconductive detector system exhibiting high energy and position resolution

Abstract A new superconductive detector system employing quasiparticle trapping from a separate absorber into two superconducting tunnel junctions is investigated. The energy resolution for the 55 Mn-K α -energy (5.89 keV) is 60 eV (FWHM) and the position resolution was determined to be better than 5 μ over a sensitive length of 450 μm. A quasiparticle rejection efficiency of better than 99.6% was measured for a thick superconducting lead barrier between two superconducting tin absorbers.