Experimental evidence of an incomplete thermalization of the energy in an x-ray microcalorimeter with a Ta ∕ Au absorber

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 supercondu...

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Bibliographic Details
Published in:Review of scientific instruments 2008-05, Vol.79 (5)
Main Authors: Perinati, E., Barbera, M., Varisco, S., Silver, E., Beeman, J., Pigot, C.
Format: Article
Language:English
Subjects:
ABSORPTION
CALORIMETERS
COMPARATIVE EVALUATIONS
DOPED MATERIALS
GERMANIUM
GOLD
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NEUTRONS
PHOTONS
QUASI PARTICLES
SEMICONDUCTOR MATERIALS
SENSORS
TANTALUM
THERMALIZATION
TYPE-I SUPERCONDUCTORS
X RADIATION
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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2924211