Abstract. The fl+ decay of 86Mo has been firstly investigated by means of f17 spectroscopy. The 86Mo nuclei were produced by fusion-evaporation reactions of 54Fe (35C1, 1 p2n) and 58Ni (32S, 2p 2n) at beam energies of 103 and t20 MeV, respectively. Three 7 rays of 47.3, 49.8 and 187.0 keV were unambiguously identified to follow the fl+ decay of 86Mo by results of X7 and f17 coincidence and cross-bombardment. A half life and a maximum fl+-ray energy of 86Mo were determined to be 19.6_ 1.1 s and 3.9_+ 0.4 MeV, respectively. A decay scheme of 86Mo is proposed in this article. Furthermore, a decay of S6Nb has been studied using the same combinations of projectiles and targets, and a new fl-decaying isomer 86mNb was observed with a half life of 56.3 _+ 8.3 s.
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