Study of the Decay of Tm 168 to Levels in Er 168 Using …
1964; American Institute of Physics; Volume: 133; Issue: 3B Linguagem: Inglês
10.1103/physrev.133.b556
ISSN1536-6065
AutoresJ. J. Reidy, E.G. Funk, J. W. Mihelich,
Tópico(s)Radioactive contamination and transfer
ResumoThe levels in ${\mathrm{Er}}^{168}$ populated by electron capture of ${\mathrm{Tm}}^{168}$ have been studied using scintillation spectrometers, gamma-gamma and electron-gamma coincidence measurements, and directional correlation techniques. This work leads to the following conclusions: the spin and parity of the 1543-keV level are verified as 3-; the 1280-keV transition is $E1(<~0.08%M2)$; the 721-keV transition is $E1(<~0.05%M2)$; and the 743-keV transition is $E2(<~2.4%M1)$. The attenuation coefficient ${\overline{G}}_{2}$ for the 1280-80-keV correlation was determined to be 0.77\ifmmode\pm\else\textpm\fi{}0.19 for a source consisting of a dilute aqueous solution of Tm${\mathrm{Cl}}_{3}$. The analysis of the results of the ${\mathrm{Tm}}^{168}$ decay is compared with the predictions using various models. The ratios of reduced transition probabilities for transitions from the gamma vibrational band in ${\mathrm{Er}}^{168}$ are analyzed and a bandmixing parameter $z=0.055$ is found.
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