Abstract
Level structure of the 89-neutron nucleus153Gd has been investigated by studying theEC-decay of isotope-separated153Tb sources with several semiconductor detectors. In addition to singles gamma and electron spectra,γ-γ ande −-γ coincidences were investigated by using Ge(Li) and Si(Li) spectrometers and a high-capacity two-parameter recording system. In all, 191γ-rays are assigned to the decay of the 2.4d153Tb. The proposed level scheme of153Gd containing most of the observed transitions shows a very high density of low-spin states (45 states below 1.5MeV). Spin and/or parity assignments based mainly on coincidence data and measured transition multipolarities are proposed for a majority of these states. Nilsson model classifications of some levels are discussed. On the basis of logf t values the spin and parity of the ground state of153Tb are suggested to be 3/2+ or 5/2+.
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We wish to thank Armas Fontell for carrying out several careful mass separations.
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Tuurnala, T., Siivola, A., Jartti, P. et al. Low-spin states of153Gd observed in the decay of153Tb. Z. Physik 266, 103–116 (1974). https://doi.org/10.1007/BF01668708
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DOI: https://doi.org/10.1007/BF01668708