New isotope 276Ds and its decay products 272Hs and 268Sg from the 232Th+48Ca reaction

The 232Th+48Ca reaction has been studied at the gas-filled separator DGFRS-2 online to the cyclotron DC280 at the SHE Factory at JINR. Three new nuclides were synthesized for the first time: a spontaneously fissioning (SF) 268Sg with the half-life TSF = 13+17 -4 s; an alpha decaying 272Hs with T alpha = 0.16+0.19-0.06 s and E alpha = 9.63 +/- 0.02 MeV; and 276Ds with T1/2 = 0.15+0.10 -0.04 ms, E alpha = 10.75 +/- 0.03 MeV, and an SF branch of 57%. The decay properties of these nuclei are in agreement with the systematics of experimental partial half-lives and alpha-decay energies of heavy known nuclei, as well as spontaneous-fission half-lives. The cross sections of the 4n-evaporation channel of 0.07+0.17 -0.06 pb, 0.7+1.1 -0.5 pb, and 0.11+0.46 -0.09 pb were measured at 231, 238, and 251 MeV, respectively.