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From data accumulated over 6140 h with 172 g of enriched molybdenum (1.18 molyr of loOMo) with the NEMO 2 detector in the Frbjus Underground Laboratory, a clear ,B,B21/ signal (1433 events) is observed, leading to a half-life, TIj2 = 0.95 i 0.04(stat) i O.O9(syst) 10'' yr. The experimental two-electron energy spectrum and the two-electron angular distribution are in agreement with the expected ones. Limits for PPOv decays to the ground state, excited states (2: and 0:), and also with Majoron emission are given. PACS number(s): 23.40.Bw, 14.60.Pq-

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