Abstract
Using the reactor-produced lanthanum isotope 13757 La, the hyperfine structure (hfs) of the transition La I, 5d 2 6p z 4 G 2/011 −5d 2 6s a 4 F 9/2, λ=6250 Å and La I, 5d 2 6p z 2 H 2/011 − 5d 2 6s a 2G9/2, λ=6266 Å were measured by means of a Fabry-Pérot interferometer. The nuclear spin I (137La)=7/2, already theoretically estimated by earlier authors, was confirmed. The nuclear magnetic dipole moment μI(137La)=+ 2.690 (6) n.m. and the electric quadrupole momentQ(137La)=+ 0.26 (8) · 10−24 cm2 were determined from the ratios of the hfs interaction constantsA andB of137La and the natural139La.
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Partly reported at the “Frühjahrstagung der DPG”, Regensburg 1972.
Extract from the thesis of K. Mandrek, Marburg 1972.
The authors are very much indebted to Prof. E. Gerdau and Dr. H. Winkler, II. Physikalisches Staatsinstitut Hamburg, who placed some 100 μg of137La at their disposal and to Dr. H. Ihle, Kernforschungsanlage Jülich, for performing the mass spectrometric analysis and to Prof. W. Walcher for helpful discussions. The Deutsche Forschungsgemeinschaft provided a great part of the experimental apparatus.
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Fischer, W., Hühnermann, H. & Mandrek, K. Optical determination of the nuclear moments of137La. Z. Physik 254, 127–132 (1972). https://doi.org/10.1007/BF01380061
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DOI: https://doi.org/10.1007/BF01380061