Search for 2β decay of cadmium and tungsten isotopes: Final results of the Solotvina experiment

Final results of the double β decay experiment, performed with the help of low background ¹¹⁶CdWO₄ crystal scintillators in the Solotvina Underground Laboratory, are presented. In particular, the revised half-life value of the two-neutrino 2β decay of ¹¹⁶Cd has been measured as T_1/2^2ν=2.9_-0.3^+0.4×10¹⁹yr, and the new half-life limit on the neutrinoless 2β decay of ¹¹⁶Cd has been established as T_1/2^0ν>~1.7(2.6)×10²³yr at 90% (68%) C.L. The latter corresponds to a restriction on the neutrino mass: m_ν<~1.7(1.4)eV at 90% (68%) C.L. Besides, new T_1/2 bounds (at the level of 10¹⁷–10²¹yr) were set for various 2β processes in ¹⁰⁶Cd, ¹⁰⁸Cd, ¹¹⁴Cd, ¹⁸⁰W, and ¹⁸⁶W nuclei.