Abstract.
Using the internal conversion electron spectroscopy, the energy of the 15.1 keV \( M1+E2\) nuclear transition in 227Th populated in the \( \beta^{-}\) decay of 227Ac was determined to be \( 15098.6 \pm 1.0\) eV. This value is more accurate than the present accepted one by a factor of 200. The present uncertainty in the transition multipolarity was removed and it was found to be \( M1+E2\) with the admixture \( \vert\delta (E2/M1)\vert = 0.035 \pm 0.006\).
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Communicated by M.J. Garcia Borge
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Kovalík, A., Inoyatov, A.K., Perevoshchikov, L.L. et al. An experimental investigation of the 15.1 keV M1 + E2 nuclear transition in 227Th from the \(\beta^{-}\) decay of 227Ac. Eur. Phys. J. A 55, 131 (2019). https://doi.org/10.1140/epja/i2019-12812-5
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DOI: https://doi.org/10.1140/epja/i2019-12812-5