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Title: Non-equilibrium superconductivity in niobium and its application to particle detection
Author: Gaitskell, Richard J.
ISNI:       0000 0001 3486 5537
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1993
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The propagation of non-equilibrium phonon and quasiparticle signals in bulk single crystal superconducting niobium has been investigated using superconducting tunnel junctions. Excitations generated by pulsed laser light and particle interactions were studied in 2-12 g crystals. At temperatures below 2 K the lifetimes of non-equilibrium phonons were found to be very much shorter that the theoretical bulk anharmonic decay times. Quasiparticle propagation was observed limited by impurity scattering. The proximity effect in Al thin films on Nb single crystal surface was studied. Particle interactions were detected in Nb with both position and energy resolution. The possibilities for using a detector based on superconducting single crystal niobium for a dark matter search are discussed.
Supervisor: Salmon, Graeme L. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Superconductivity ; Niobium ; Nuclear counters