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Keywords:

Science & Technology, Physical Sciences, Physics, Nuclear, Physics, Particles & Fields, Physics, radioactive nuclei, shape coexistence, beta decay, gamma spectroscopy, NUCLEAR-DATA SHEETS, ODD BI ISOTOPES, ALPHA-DECAY, HG-184, BANDS, SPECTROSCOPY, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics, 5107 Particle and high energy physics

Abstract:

The ${\beta }^{+}$/EC decay of ${}^{\mathrm{182,184}}$Tl to excited states in the daughter nuclei ${}^{\mathrm{182,184}}$Hg has been investigated at the CERN on-line isotope mass separator facility. In both Tl nuclei two β-decaying states were observed. In the case of 184Tl, narrow-band laser spectroscopy could be used to disentangle the decay of both isomers. In 182Hg a precise energy of 335 (1) keV for the ${0}_{2}^{+}$ state was measured together with its feeding from a tentatively proposed ${2}_{3}^{+}$ state at 973 keV. Large conversion coefficients for the ${2}_{2}^{+}\to {2}_{1}^{+}$ transition in ${}^{\mathrm{182,184}}$Hg were measured to be 7.2 (13) and 14.2 (36), respectively, evidencing a strong E0 component.