First Experiment at the Super Heavy Element Factory: New Data from the 243Am + 48Ca Reaction
Kovrizhnykh N.D. Oganessian Y.T. Utyonkov V.K. Abdullin F.S. Dmitriev S.N. Dzhioev A.A. Ibadullayev D. Itkis M.G. Karpov A.V. 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. Shumeiko M.V. Solovyev D.I. Tsyganov Y.S. Voinov A.A. Subbotin V.G. Bodrov A.Y. Sabel’nikov A.V. Khalkin A.V.
August 2023Pleiades Publishing
Bulletin of the Russian Academy of Sciences: Physics
2023#87Issue 81098 - 1104 pp.
Abstract: We presented the results of the series of experiments on the synthesis of Mc isotopes in the 243Am + 48Ca reaction performed at the new separator DGFRS-2 and cyclotron DC280 of the SHE Factory at FLNR JINR. There were registered 110 new 288Mc decay chains, 10 289Mc chains, and 4 287Mc chains. Alpha decay of 268Db with an energy of 7.6–8.0 MeV, half-life (Formula Presented.) h and α-branch (Formula Presented.) % was registered for the first time together with a new spontaneously fissioning isotope 264Lr with a half-life of (Formula Presented.) h The measured cross section of the 243Am(48Ca, 3n)288Mc reaction was (Formula Presented.) pb, which is the largest for known superheavy nuclei. A new isotope 286Mc was synthesized with a half-life of 20 (Formula Presented.) ms and an α-particle energy of 10.71 ± 0.02 MeV. Spontaneous fission of 279Rg was first observed in one of the four new decay chains of 287Mc. The reaction excitation function was measured at six 48Ca energies in the range of 239–259 MeV, which led to the first observation of the 5n channel with a cross section of 0.5 (Formula Presented.) pb. The decay properties of 20 previously known isotopes have been determined with higher accuracy.
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Joint Institute for Nuclear Research, Moscow oblast, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Gumilyov Eurasian National University, Nur-Sultan, 010000, Kazakhstan
Faculty of Science, Palacky University Olomouc, Olomouc, 771 46, Czech Republic
Moscow State University, Department of Chemistry, Moscow, 119991, Russian Federation
Joint Institute for Nuclear Research
Institute of Nuclear Physics
Gumilyov Eurasian National University
Faculty of Science
Moscow State University
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