Search for 2-beta decays of 96^Ru and 104^Ru by ultralow-background HPGe gamma spectrometry at LNGS: Final Results
Belli, P., Bernabei, R., Cappella, F., Cerulli, R., Danevich, F.A., D'Angelo, S., Incicchitti, A., Kovtun, G.P., Laubenstein, M., Poda, D.V., Polishuk, O.G., Shcherban, A.P., Solopikhin, D.A., Suhonen, J., & Tretyak, V.I. (2013). Search for 2-beta decays of 96^Ru and 104^Ru by ultralow-background HPGe gamma spectrometry at LNGS: Final Results. Physical Review C, 87(3), Article 034607. https://doi.org/10.1103/PhysRevC.87.034607
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Date
2013Copyright
© 2013 American Physical Society. Published in this repository with the kind permission of the publisher.
An experiment to search for double-β decay processes in 96Ru and 104Ru, which are accompanied by γ
rays, has been realized in the underground Gran Sasso National Laboratories of the I.N.F.N. (Italy). Ruthenium
samples with masses of ≈0.5–0.7 kg were measured with the help of ultralow-background high-purity Ge γ -ray
spectrometry. After 2162 h of data taking the 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 half-life limits on 2β+/εβ+/2ε
processes in 96Ru have been established on the level of 1020 yr, in particular for decays to the ground state of 96Mo:
T 2ν2β+
1/2 1.4 × 1020 yr, T 2νεβ+
1/2 8.0 × 1019 yr, and T 0ν2K 1/2 1.0 × 1021 yr (all limits are at 90% C.L.). The
resonant neutrinoless double-electron captures to the 2700.2 and 2712.7 keV excited states of 96Mo are restricted
as T 0νKL
1/2 2.0 × 1020 yr and T 0ν2L 1/2 3.6 × 1020 yr, respectively. Various two-neutrino and neutrinoless 2β
half-lives of 96Ru have been estimated in the framework of the quasiparticle random-phase approximation
approach. In addition, the T1/2 limit for 0ν2β− transitions of 104Ru to the first excited state of 104Pd has been set
as 6.5 × 1020 yr.
...
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