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Experimental evidence of an incomplete thermalization of the energyin an x-ray microcalorimeter with a Ta ∕ Au absorber
Ist Teil von
Review of scientific instruments, 2008-05, Vol.79 (5), p.053905-053905-4
Ort / Verlag
American Institute of Physics
Erscheinungsjahr
2008
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We have conducted an experimental test at our XACT facility using an x-ray microcalorimeter with
Ta
∕
Au
absorber and neutron transmutation doped germanium thermal sensor. The test was aimed at measuring the percentage of energy effectively thermalized after absorption of x-ray photons in superconducting tantalum. Moreover, in general, possible formation of long living quasiparticles implies that by using a superconducting absorber, a fraction of the deposited energy could not be thermalized on the useful time scale of the thermal sensor. To investigate this scenario, we exploited an absorber made of gold, where no energy trapping is expected, with a small piece of superconducting tantalum attached on top. We obtained evidence that the thermalization of photons absorbed in tantalum is delayed by energy trapping from quasiparticles. We compare the experimental results with numerical simulations and derive a value for the intrinsic lifetime of quasiparticles.