Developments in superconducting tunnel junction detectors

Abstract Superconducting tunnel junctions (STJs) have a large possibility of being utilized as radiation detectors of ultrahigh energy resolution. In fact, Sn/SnO x /Sn junctions as X-ray detectors have aready shown about three times higher energy resolution than Si detectors. Recently, in addition to Sn junctions, studies of new-type STJ detectors are in progress. Research into STJ detectors, including our recent studies on Nb/AlAlO x /Nb junctions witha single crystal Nb film and on series-connected STJ detectors, are briefly reviewed.

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