Details

Autor(en) / Beteiligte

• Perinati, E
• Barbera, M
• Varisco, S
• Silver, E
• Beeman, J
• Pigot, C

Titel

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

Ist Teil von

• Review of scientific instruments, 2008-05, Vol.79 (5), p.053905-053905

Ort / Verlag

United States

Erscheinungsjahr

2008

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We have conducted an experimental test at our XACT facility using an x-ray microcalorimeter with TaAu 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.