Abstract
High-precision measurements ofK Auger electron andK x-ray intensities have been made for several transuranium elements and these have been used to determineK-shell fluorescence yields (ω K ). The electron spectra were measured with a cooled Si(Li) spectrometer and the photon spectra were taken with Ge(Li) diodes. Very thin mass-separated samples of nuclides, which decay predominantly by electron capture, were used in the present experiments. From our present measurements the following values ofK- shell fluorescence yield have been obtained: Np, 97.2±0.3%; Pu, 97.2±0.4%; Cm, 97.1 ±0.6%; Bk, 97.1±0.4%; Cf, 97.3±0.4%; and Es, 97.2±0.5%. These numbers indicate that theK-fluorescence yield for elements in theZ=93 toZ=99 region remains constant within the experimental error. The weighted average of these numbers is 97.19% with external error of 0.03% and internal error of 0.17%. This value is in excellent agreement with known theoretical calculations.
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Work performed under the auspices of the Division of Basic Energy Sciences of the Department of Energy
The author wishes to thank the cyclotron crew for many irradiations, R.K. Sjoblom and J. Hines for chemical purifications and J. Lerner for the isotope separator preparation of sources.
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Ahmad, I. Precision measurement ofK-shell fluorescence yields in actinide elements. Z Physik A 290, 1–5 (1979). https://doi.org/10.1007/BF01408472
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DOI: https://doi.org/10.1007/BF01408472