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arXiv · 1110.3690

Search for double beta decay processes in 106Cd with the help of 106CdWO4 crystal scintillator

P. Belli·R. Bernabei·R. S. Boiko·V. B. Brudanin·F. Cappella·V. Caracciolo·R. Cerulli·D. M. Chernyak·F. A. Danevich·S. d'Angelo·E. N. Galashov·A. Incicchitti·V. V. Kobychev·M. Laubenstein·V. M. Mokina·D. V. Poda·R. B. Podviyanuk·O. G. Polischuk·V. N. Shlegel·Yu. G. Stenin·J. Suhonen·V. I. Tretyak·Ya. V. Vasiliev
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Abstract

A search for the double beta processes in 106Cd was carried out at the Gran Sasso National Laboratories of the INFN (Italy) with the help of a 106CdWO4 crystal scintillator (215 g) enriched in 106Cd up to 66%. After 6590 h of data taking, new improved half-life limits on the double beta processes in 106Cd were established at the level of 10^{19}-10^{21} yr; in particular, T_{1/2}(2νεβ^+) > 2.1 10^{20} yr, T_{1/2}(2ν2β^+) > 4.3 10^{20} yr, and T_{1/2}(0ν2ε) > 1.0 10^{21} yr. The resonant neutrinoless double electron captures to the 2718 keV, 2741 keV and 2748 keV excited states of 106Pd are restricted to T_{1/2}(0ν2K) > 4.3 10^{20} yr, T_{1/2}(0νKL1) > 9.5 10^{20} yr and T_{1/2}(0νKL3) > 4.3 10^{20} yr, respectively (all limits at 90% C.L.). A possible resonant enhancement of the 0ν2εprocesses is estimated in the framework of the QRPA approach. The radioactive contamination of the 106CdWO4 crystal scintillator is reported.

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P. Belli, R. Bernabei, R. S. Boiko, V. B. Brudanin, F. Cappella, V. Caracciolo, R. Cerulli, D. M. Chernyak, F. A. Danevich, S. d'Angelo, E. N. Galashov, A. Incicchitti, V. V. Kobychev, M. Laubenstein, V. M. Mokina, D. V. Poda, R. B. Podviyanuk, O. G. Polischuk, V. N. Shlegel, Yu. G. Stenin, J. Suhonen, V. I. Tretyak, Ya. V. Vasiliev. 2012-03-31. Search for double beta decay processes in 106Cd with the help of 106CdWO4 crystal scintillator. https://doi.org/10.1103/physrevc.85.044610

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