| Autor: |
Hansen, H. H., Lowenthal, G., Spernol, A., van der Eijk, W., Vaninbroukx, R. |
| Zdroj: |
Zeitschrift für Physik A Hadrons and Nuclei; February 1969, Vol. 218 Issue: 1 p25-36, 12p |
| Abstrakt: |
The decay of137Cs has been reinvestigated using several precision counting methods. The emission rate ofß-particles plus internal conversion electrons was measured by the 4p-proportional counter method using vacuum evaporated sources free of self-absorption and checked by the liquid scintillation method. TheK-conversion coefficient was determined by the electron X-ray coincidence method using a magnetic spectrometer and a high resolution Si(Li) detector. TheK/(L+M+...) conversion ratio and a second less accurate value for the ß-branching ratio were obtained from the recorded electron spectra. The?-ray emission rate of all sources was determined to within ±0.14%, on the average, with a calibrated NaI(Tl) crystal detector. As results the intensity of theß-decay to the ground state of137Ba could be determined to (5.4±0.3)% of the137Cs decays, theK-conversion coefficient to 0.0916±0.0004, and theK/(L+M+...) conversion ratio to 4.41±0.04. From these values the ?-ray emission intensity is (85.1±0.4)% of the137Cs decays and theK X-ray emission intensity is (8.13±0.10)% of the emitted?-rays. All errors are discussed in detail. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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