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In the period August October 2010, we investigated the even -even superheavy nucleus 270Ds, employing the reaction64Ni + 207Pb−→270Ds. In a first attempt, published in 2001, a total of eight decay chains of type evaporation residue (ER)α-α sf (270Ds−→266Hs262Sg) was observed. Now, in a period of≈ 40 days of beam on target, we accumulated 25 decay chains of 270Ds, for which we measured in addition to the decay pattern observed i n the first experiment, also ERα sf and (ER)-α-α-α-sf correlations. For eight of the collected decay chains we det cted spontaneous fission of266Hs. With this we could establish the sf branch of 266Hs. The resulting branching ratio is 0.24±0.09. More importantly, however, also the searched for K-is omer in 266Hs and the α-decay branch of 262Sg was found. For the latter we detected a total of two α-decays, resulting in a262Sg α-decay branching ratio of 0.06 ±0.04. The observation of this α-decay establishes the missing link to 254No for which a precise mass value employing the Penning trap system SHIPTRAP was measured recently. Using the experimen tal Qα -values we are now able to provide an experimental mass for the even-even nucleus 270Ds. This is an important parameter for theoretical models which are used to predict masses and bind ing energies for the heaviest nuclei.

270Ds and its decay products – K-isomers, α-sf competition and masses