Abstract
Reactor produced131Cs (T 1/2=9.7 d) was used to investigate the isotope shift against the stable nuclide133Cs in the resonance lines of the Cs I spectrum. Special techniques to prepare the hollow cathode and a completely digitalized method of measuring and evaluation of the hyperfine structure made it possible to investigate short-lived isotopes with high accuracy. The following results were obtained:Δv IS(133−131; 6p 2 P 1/2−6s 2 S 1/2)=−0,39 (9) mKΔv IS(133−131; 6p 2 P 3/2−6s 2 S 1/2)=−0,28 (20) mK.
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For the radiochemical separation the authors are very much indebted to Prof.Seelmann-Eggebert, Dr.Grupe, and Dr.Wassilopulus. Thank is due to Dr.Fischer for many fruitful discussions and to Dipl.-Phys.Thielmann for his assistance with constructing and attanding the electronic instruments. The authors wish to thank Prof.Walcher for his permanent interest in their work and the Deutsche Forschungsgemeinschaft for providing the apparatus.
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Hühnermann, H., Wagner, H. Isotope shift in the resonance lines of131cesium. Z. Physik 216, 28–32 (1968). https://doi.org/10.1007/BF01380090
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DOI: https://doi.org/10.1007/BF01380090