X-RAY-DETECTION WITH NB ALOX/NB SUPERCONDUCTING TUNNEL-JUNCTIONS AND ENERGY DIFFUSION EFFECT ON ENERGY RESOLUTION/

Authors
MATSUMURA A TAKAHASHI T KURAKADO M
Citation
A. Matsumura et al., X-RAY-DETECTION WITH NB ALOX/NB SUPERCONDUCTING TUNNEL-JUNCTIONS AND ENERGY DIFFUSION EFFECT ON ENERGY RESOLUTION/, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 329(1-2), 1993, pp. 227-237
Citations number
26
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
329
Issue
1-2
Year of publication
1993
Pages
227 - 237
Database
ISI
SICI code
0168-9002(1993)329:1-2<227:XWNAST>2.0.ZU;2-N
Abstract
Nb/AlOx/Nb superconducting tunnel junctions with low leakage current w ere fabricated. The ultra low leakage current was maintained after 100 thermal cycles. X-rays were detected with three sizes of junctions on several wafers. The pulse height spectra show the improvement of ener gy resolution with the increase in junction area. Using the diffusion length of excited electrons in the superconductor, the effect of dispe rsion of excited electron from the junction area to the electric lead and trap of excited electrons at the film edge (energy diffusion effec t) was evaluated. Calculated results explain the characteristics of th e experimental results. It is concluded that a large junction area is desirable to reduce the energy diffusion effect on the energy resoluti on.