Decay of ¹⁸⁵Tl, ^185m+gHg, ^189m+gPb and energy location of the 13/2⁺ isomeric states in ¹⁸⁵Hg, ¹⁸⁹Pb, ¹⁹³Po and ¹⁹⁷Rn

The β+/EC decay of 185Tl was studied at the ISOLDE facility, the γ-rays belonging to 185Hg have been identified and a partial low-spin level scheme of 185Hg has been built. The decay of 185m+g Hg 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 EIS = 103.7(4) keV. This EIS value is consistent with that determined independently, EIS = 94(13) keV, using 185m+g Hg α-decay data from literature. New α particles emitted from 189m+gPb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility. α-γ coincidence results have served to locate the 13/2+ isomeric state of 189Pb at EIS = 40(4) keV. This latter EIS value added to α-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 α-emitter chains starting with 195m+g,197m+g,199m+g Rn are discussed. © The Author(s) 2013.