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+/ɛβ+/2ɛ processes in 96Ru have been established on the level of 1020 yr, in particular for decays to the ground state of 96Mo: T1/22ν2β+≥1.4×1020 yr, T1/22νɛβ+≥8.0×1019 yr, and T1/20ν2K≥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 T1/20νKL≥2.0×1020 yr and T1/20ν2L≥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.

Belli, P., Bernabei, R., Cappella, F., Cerulli, R., Danevich, F.a., D'Angelo, S., et al. (2013). Search for 2β decays of 96Ru and 104Ru by ultra-low background HPGe spectrometry at LNGS: final results. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 87(3), 034607-1-034607-8 [10.1103/PhysRevC.87.034607].

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

BERNABEI, RITA;D'ANGELO, SILIO;
2013-03-06

Abstract

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+/ɛβ+/2ɛ processes in 96Ru have been established on the level of 1020 yr, in particular for decays to the ground state of 96Mo: T1/22ν2β+≥1.4×1020 yr, T1/22νɛβ+≥8.0×1019 yr, and T1/20ν2K≥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 T1/20νKL≥2.0×1020 yr and T1/20ν2L≥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.
6-mar-2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
http://link.aps.org/doi/10.1103/PhysRevC.87.034607
Belli, P., Bernabei, R., Cappella, F., Cerulli, R., Danevich, F.a., D'Angelo, S., et al. (2013). Search for 2β decays of 96Ru and 104Ru by ultra-low background HPGe spectrometry at LNGS: final results. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 87(3), 034607-1-034607-8 [10.1103/PhysRevC.87.034607].
Belli, P; Bernabei, R; Cappella, F; Cerulli, R; Danevich, Fa; D'Angelo, S; Incicchitti, A; Kovtun, G; Kovtun, N; Laubenstein, M; Poda, D; Polischuk, O...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/79961
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