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

Marco Barbera, Pigot, Silver, Varisco, Perinati, Jeffery Beeman

Risultato della ricerca: Articlepeer review

6 Citazioni (Scopus)

Abstract

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.
Lingua originaleEnglish
pagine (da-a)053905-1-053905-4
Numero di pagine4
RivistaReview of Scientific Instruments
Volume79
Stato di pubblicazionePublished - 2008

All Science Journal Classification (ASJC) codes

  • Instrumentation

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