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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Friedrich, H. Pohl, H.-J. Riemann, H. Becker, P. |
| Copyright Year | 2002 |
| Description | Author affiliation: Phys.-Technische Bundesanstalt Braunschweig, Germany (Friedrich, H.) |
| Abstract | Progress in the experiments for the redefinition of the unit of mass by the X-ray crystal density method is hampered mainly by the insufficient accuracy of silicon molar mass. This paper reports on considerations to calibrate prompt (n,/spl gamma/) spectrometry against data obtained by mass spectrometry. When natural silicon, where df/spl ap/10/sup -6/ is known from mass spectroscopy, is compared with isotopically enriched silicon, two difficulties are overcome: (a) the cross sections etc. cancel out, and (b) the gain in isotopic enrichment is roughly valid for df, too. So, from df=10/sup -6/ we end up with df=6.3/spl times/10/sup -8/ for f/spl ges/0.9995. This material then is used for the fabrication of the 1 kg sphere on which the density and the lattice constant are determined. |
| Starting Page | 302 |
| Ending Page | 303 |
| File Size | 119206 |
| Page Count | 2 |
| File Format | |
| ISBN | 0780372425 |
| DOI | 10.1109/CPEM.2002.1034841 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-06-16 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Silicon Mass spectroscopy Neutrons Equations Crystals Crystalline materials Calibration Fabrication Lattices Energy capture |
| Content Type | Text |
| Resource Type | Article |
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