First results of the experiment to search for 2β decay of 106Cd with the help of 106CdWO4 crystal scintillators

• Main Authors: P. Bell, R. Bernabei, R. S. Boiko, V. B. Brudanin, F. Cappella, V. Caracciolo, R. Cerulli, D. M. Chernyak, F. A. Danevich, S. d'Angelo, A. E. Dossovitskiy, E. N. Galashov, A. Incicchitti, V. V. Kobychev, S. S. Nagorny, F. Nozzoli, B. N. Kropivyansky, V. M. Kudovbenko, A. L. Mikhlin, A. S. Nikolaiko, D. V. Poda, O. G. Polischuk, D. Prosperi, V. N. Shlegel, Yu. G. Stenin, J. Suhonen, V. I. Tretyak, Ya. V. Vasiliev, R. B. Podviyanuk
• Format: Article
• Language: English
• Published: Institute for Nuclear Research, National Academy of Sciences of Ukraine 2011-06-01
• Series: Âderna Fìzika ta Energetika
• Subjects: double beta decay; 106Cd; CdWO4 crystal scintillator.
• Online Access: http://jnpae.kinr.kiev.ua/12.2/Articles_PDF/jnpae-2011-12-0124-Belli.pdf

An experiment to search for 2β processes in 106Cd with the help of 106CdWO4 crystal scintillator (mass of 215 g), enriched in 106Cd up to 66 %, is in progress at the Gran Sasso National Laboratories of the INFN (Italy). After 1320 h of data taking, limits on double beta processes in 106Cd have been established on the level of 1019 − 1020 yr, in particular (all the results at 90 % C.L.): T1/2(0ν2ε) > 3.6 · 1020 yr, T1/2(2νεβ+) > 7.2 · 1019 yr, and T1/2(2ν2β+) > 2.5 · 1020 yr. Resonant 0ν2ε processes have been restricted as T1/2(0ν2K) > 1.4 · 1020 yr and T1/2(0νLK) > 3.2 · 1020 yr. A possible resonant enhancement of the 0ν2ε processes is estimated in the framework of the QRPA approach.