THE PROPERTIES OF NIOBIUM SUPERCONDUCTING TUNNELING JUNCTIONS AS X-RAY-DETECTORS

被引：155

作者：

RANDO, N ^{[1
]}

PEACOCK, A ^{[1
]}

VANDORDRECHT, A ^{[1
]}

FODEN, C ^{[1
]}

ENGELHARDT, R ^{[1
]}

TAYLOR, BG ^{[1
]}

GARE, P ^{[1
]}

LUMLEY, J ^{[1
]}

PEREIRA, C ^{[1
]}

机构：

[1] CRYOGEN CONSULTANTS LTD,CAMBRIDGE,ENGLAND

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1992年 / 313卷 / 1-2期

关键词：

D O I：

10.1016/0168-9002(92)90095-L

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The properties of superconducting tunnel junctions based on niobium are investigated. The limiting resolution of such junctions should be congruent-to keV X-rays. Currently only between 2 to 25% of the theoretical charge is detected. The principal loss mechanisms, which not only reduce charge but seriously degrade resolution, are found to be phonon loss to the substrate, and recombination of the excess quasi-particle population in both films. The phonon loss is probably due to relaxation phonons from quasi-particles relaxing towards the bandgap. The quasi-particle self recombination is a direct result of the very large excursion from equilibrium produced during the X-ray photoabsorption process. Finally 6 keV X-rays have been detected directly in sapphire crystals by using the niobium junction only as a detector of beamed ballistic phonons. The use of a suitable crystal as the X-ray absorber and phonon source opens up interesting possibilities for position sensitive spectrometers based on high quality niobium junctions.

引用

页码：173 / 195

页数：23

共 78 条

[1] CONDUCTANCE STUDIES ON DIFFERENT TYPES OF NB/AL,AIOX(/AL)/NB JOSEPHSON TUNNEL-JUNCTIONS [J].