Investigation of double-beta decay with the NEMO-3 detector

The double-beta-decay experiment NEMO-3 has been taking data since February 2003. The aim of this experiment is to search for neutrinoless (0 nu(II2)-I-2) decay and investigate two neutrino doublebeta decay in seven different isotopically enriched samples (Mo-100, Se-82, Ca-48, Zr-96, Cd-116, Te-130, and Nd-150). After analysis of the data corresponding to 3.75 yr, no evidence for 0 nu(II2)-I-2 decay in the 100Mo and 82Se samples was found. The half-life limits at the 90% C.L. are 1.1 x 10(24) and 3.6 x 10(23) yr, respectively. Additionally for 0 nu(II2)-I-2 decay the following limits at the 90% C.L. were obtained, > 1.3 x 10(22) yr for Ca-48, > 9.2 x 10(21) yr for Zr-96, and > 1.8 x 10(22) yr for 150Nd. The 2 nu(II2)-I-2 decay half-life values were precisely measured for all investigated isotopes.