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

Oganessian Y.T. Utyonkov V.K. Shumeiko M.V. Abdullin F.S. Dmitriev S.N. Ibadullayev D. Itkis M.G. Kovrizhnykh N.D. Kuznetsov D.A. Petrushkin O.V. Podshibiakin A.V. Polyakov A.N. Popeko A.G. Rogov I.S. Sagaidak R.N. Schlattauer L. Shubin V.D. Solovyev D.I. Tsyganov Y.S. Voinov A.A. Subbotin V.G. Bublikova N.S. Voronyuk M.G. Sabelnikov A.V. Bodrov A.Y. Gan Z.G. Zhang Z.Y. Huang M.H. Yang H.B.
August 2023 American Physical Society

Physical Review C
2023 #108 Issue 2

The Th232+Ca48 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) Sg268 with the half-life TSF=13+17-4 s; an α decaying Hs272 with Tα=0.16+0.19-0.06 s and Eα=9.63±0.02MeV; and Ds276 with T1/2=0.15+0.10-0.04 ms, Eα=10.75±0.03MeV, and an SF branch of 57%. The decay properties of these nuclei are in agreement with the systematics of experimental partial half-lives and α-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.

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Joint Institute for Nuclear Research, Dubna, RU-141980, Russian Federation
L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
Palacky University Olomouc, Department of Experimental Physics, Faculty of Science, Olomouc, 771 46, Czech Republic
Lomonosov Moscow State University, Department of Chemistry, Radiochemistry Division, Moscow, RU-119991, Russian Federation
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

Joint Institute for Nuclear Research
L.N. Gumilyov Eurasian National University
Palacky University Olomouc
Lomonosov Moscow State University
Institute of Modern Physics

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