Experimental limits on the branching ratio of double electron capture in 196Hg
Zdesenko Yu. G., Kuts V. N.
An experiment lasting 1478 h has shown that the half-life for the decay of 196Hg through neutrinoless double electron capture is, with a confidence level of 68%, longer.than 1.3 χ 1017 yr. The experiment was carried out in an underground laboratory with a low-background semiconductor spectrometer.