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An experiment to search for double beta decay processes in 96Ru and 104Ru,which are accompanied by gamma rays, has been realized in the underground GranSasso National Laboratories of the I.N.F.N. (Italy). Ruthenium samples withmasses of about (0.5-0.7) kg were measured with the help of ultra-lowbackground high purity Ge gamma ray spectrometry. After 2162 h of data takingthe samples were deeply purified to reduce the internal contamination of 40K.The last part of the data has been accumulated over 5479 h. New improved halflife limits on 2\beta+/\epsilon \beta+/2\epsilon\ processes in 96Ru have beenestablished on the level of 10^{20} yr, in particular for decays to the groundstate of 96Mo: T1/2(2\nu 2\beta+) > 1.4 10^{20} yr, T1/2(2\nu \epsilon\beta+) >8.0 10^{19} yr and T1/2(0\nu 2K) > 1.0 10^{21} yr (all limits are at 90% C.L.).The resonant neutrinoless double electron captures to the 2700.2 keV and 2712.7keV excited states of 96Mo are restricted as: T1/2(0\nu KL) > 2.0 10^{20} yrand T1/2(0\nu 2L) > 3.6 10^{20} yr, respectively. Various two neutrino andneutrinoless 2\beta\ half lives of 96Ru have been estimated in the framework ofthe QRPA approach. In addition, the T1/2 limit for 0\nu 2\beta- transitions of104Ru to the first excited state of 104Pd has been set as > 6.5 10^{20} yr.

Search for 2\beta\ decays of 96Ru and 104Ru by ultra-low background HPGe gamma spectrometry at LNGS: final results