Aurora experiment: Final results of studies of 116Cd 2β decay with enriched 116CdWO4 crystal scintillators
- Tretyak V I
- Barabash A S
- Belli P
- Bernabei R
- Cappella F
- Caracciolo V
- Cerulli R
- Chernyak D M
- Danevich F A
- d’Angelo S
- Incicchitti A
- Kasperovych D V
- Kobychev V V
- Konovalov S I
- Laubenstein M
- Poda D V
- Polischuk O G
- Shlegel V N
- Umatov V I
- Vasiliev Ya V
DOIAbstract
Final results of studies of 116Cd 2β decay with CdWO4 crystal scintillators, enriched in 116Cd to 82%, are presented. After few years (2011 – 2017) of measurements with radiopure 116CdWO4 scintillators (mass of 1.162 kg) at the Gran Sasso underground laboratory (Italy), the half-life of 116Cd relatively to 2ν2β decay to the ground state of 116Sn was measured with the highest up-to-date accuracy as T1/2=(2.63+0.11−0.12)×10^19 yr. A new limit on 0ν2β decay of 116Cd was set as T1/2≥2.2×10^23 yr at 90% C.L., which is the most stringent to-date restriction for this isotope. Limits for 0ν2β decay with majoron(s) emission, Lorentz-violating 2ν2β decay and 2β transitions to excited states of 116Sn were set at the level of T1/2≥10^20−10^22 yr
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