Verzweigungsverhältnisse und Konversionskoeffizienten von angeregten Zuständen des208Tl |
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Authors: | Karl Ilgen |
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Institution: | 1. Institut für Strahlenphysik der Technischen Hochschule Stuttgart, Deutschland
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Abstract: | The branching ratios of theγ rays of the second and fourth excited states of208Tl have been investigated by coincidence measurements between the α rays of212Bi and subsequent 40keVγ ray. The detectors employed were a silicon surface barrier counter for α particles, and a 1.5 in ×2 mm NaJ (Tl) crystal forγ rays. It has been found that (75.6±3.7)% of all transitions of the 328 keV state and (94±7)% of all transitions of the (492 keV+473 keV) states populate the first excited state of208Tl. The 40 keV state is excited to (3.4±0.3)% by transitions of higher excited states relative to the direct excitation by α particles. The number of α particles with energyE α = 6.047 MeV and the number of subsequent 40keVγ rays resulted in a conversion coefficient α(40keV)=22.55± 0.46. Similarly coincidence measurements between Tl-x rays and α particles have been used to determine theK- conversion coefficients αK(328 keV)=0.31±0.03 and αK(492 keV+ 473keV)=0.100±0.015. The experimental results are in good agreement with the theoretical values ofSliv. |
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