Abstract
Conversion electron spectra, gamma rays, and e-γ and γ-γ coincidences in the decay of155Tb were investigated. The conversion electron spectra were measured with a toroidal six-gap beta spectrometer and a two-fold double-focusing π √2 beta spectrometer. The gamma rays were measured by means of Ge(Li) detectors. The e-γ-coincidence spectra were investigated by means of the six-gap beta spectrometer and a NaI(Tl)-gamma spectrometer. The γ-γ-coincidences were studied by the method of two-dimensional analysis with the use of two coaxial Ge(Li) detectors.
A number of transitions was found in155Tb decay which were not observed up to now. A more complete scheme of the decay155Tb →155Gd is proposed.
Conclusions were reached on the multipolarity of most transitions and possible spin and parity values were determined for the155Gd levels.
The populations of the excited levels in155Gd ware determined and the lgft values were calculated.
A comparison of the results obtained with the calculations by Solovev et al. based on the superfluid model of the nucleus enables one to assign the structure to the 592·6 keV state as follows: [521]↑−0·7%, [521]↑+Q 1(20)−99% and to interpret the 559·9 keV level as a mixed state of the type [521]↺−42%, [521]↑+Q 1(22)−37%, [523]↺+Q 1(22)−16%.
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In conclusion the author express their gratitude to T. Galanova, T. Parneanova and L. černá for help in handling the experimental data.
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Galan, P., Kuznetsov, V.V., Kuznetsova, M.Y. et al. 155Gd levels excited in the decay of155Tb. Czech J Phys 19, 1153–1177 (1969). https://doi.org/10.1007/BF01691762
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DOI: https://doi.org/10.1007/BF01691762