Abstract.
The \( \beta^{{+}}_{}\) /EC decay of 185Tl was studied at the ISOLDE facility, the \( \gamma\) -rays belonging to 185Hg have been identified and a partial low-spin level scheme of 185Hg has been built. The decay of 185m+gHg was studied at the ISOCELE facility. Conversion electron lines of very low-energy transitions were observed for the first time. Electron data have been obtained for four transitions in 185Au and two transitions in 185Hg . From the analysis performed using an internal energy calibration procedure the energy location of the 185mHg has been determined to be \( E_{IS}= 103.7(4)\) keV. This \( E_{IS}\) value is consistent with that determined independently, \( E_{IS}=94(13)\) keV, using 185m+gHg \( \alpha\) -decay data from literature. New \( \alpha\) particles emitted from 189m+gPb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility. \( \alpha\) -\( \gamma\) coincidence results have served to locate the \( 13/2^{+}\) isomeric state of 189Pb at \( E_{IS}=40(4)\) keV. This latter \( E_{IS}\) value added to \( \alpha\) -decay data from literature have allowed the energy location of the \( 13/2^{+}\) isomeric states of 193Po and 197Rn at 95(7)keV and 194(12)keV, respectively. The nuclear structure of the isomeric and ground states in the nuclei of the three \( \alpha\) -emitter chains starting with 195m+g, 197m+g, 199m+gRn are discussed.
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Sauvage, J., Roussière, B., Genevey, J. et al. Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn . Eur. Phys. J. A 49, 109 (2013). https://doi.org/10.1140/epja/i2013-13109-5
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DOI: https://doi.org/10.1140/epja/i2013-13109-5