Application of crystal absorbers coupled to superconducting tunnel junctions for the measurement of X rays

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The possibility of using superconducting tunnelling junctions (STJ) coupled to a crystal absorber for x-ray spectroscopy has been investigated in the range 1 to 22 keV. Photo- electrons created as a result of the x-ray photo-absorption in a suitable crystal will give rise to phonon production in the crystal-absorber. A matrix of STJs mounted on this absorber can be used essentially as microphones to detect these phonons. The total energy detected by the matrix provides a measure of the absorbed photon's energy while the distribution through the matrix provides the spatial resolution. The use of a suitable crystal absorber should significantly improve the efficiency at higher energies. This is a serious limitation which faces STJs, when used to directly absorb the radiation above a few keV.

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