Investigation of reactions with 50Ti and 54Cr for the synthesis of new elements
Oganessian Y.T. Utyonkov V.K. Abdullin F.S. Dmitriev S.N. Ibadullayev D. Itkis M.G. Karpov A.V. Kovrizhnykh N.D. Kuznetsov D.A. Petrushkin O.V. Podshibiakin A.V. Polyakov A.N. Popeko A.G. Sagaidak R.N. Saiko V.V. Schlattauer L. Shubin V.D. Shumeiko M.V. Solovyev D.I. Tsyganov Y.S. Voinov A.A. Subbotin V.G. Sabelnikov A.V. Abdusamadzoda D. Bodrov A.Y. Voronyuk M.G. Bozhikov G.A. Aksenov N.V. Khalkin A.V. Gan Z.G. Zhang Z.Y. Huang M.H. Yang H.B. Wang J.G. Zhang M.M. Huang X.Y.
July 2025American Physical Society
Physical Review C
2025#112Issue 1
The 238U(54Cr, 4n) 288Lv and 242Pu(50Ti, 3n–4n) 288,289Lv reactions have been studied at the gas-filled separator DGFRS-2 at the SHE Factory at Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research. Three new isotopes were discovered: two α-decaying nuclei 288Lv with α-particle energy Eα = 11.08 MeV and half-life T1/2 = 2.0 ms, 289Lv with Eα = 10.90 MeV, T1/2 = 2.4 ms, and granddaughter of 288Lv, spontaneously fissioning 280Cn with T1/2 = 10 µs, which was observed after the first registration of α decay of 284Fl with Eα = 10.57 MeV. Besides, for the first time we reliably registered the pxn channel of the 242Pu + 50Ti reaction which was not evidently observed in the 48Ca-induced reactions in previous studies. The cross sections of the 3n and 4n channels of the 242Pu + 50Ti reaction of (Formula presented.) pb and (Formula presented.) pb, respectively, were measured at excitation energy of the 292Lv compound nucleus E∗ = 41 MeV. The cross section of the 4n-evaporation channel of the 238U + 54Cr reaction, leading to the same compound nucleus, at E∗ = 42 MeV of (Formula presented.) fb turned out to be approximately 15 times lower than the total cross section of the 242Pu + 50Ti reaction at close excitation energy. Thus, for the first time, it was convincingly proved in an experiment that the reactions of isotopes of actinide elements with 50Ti are, by an order of magnitude, preferable to reactions with 54Cr for the synthesis of new elements 119 and 120.
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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
Heavy Ion Science and Technology Key Laboratory, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
Joint Institute for Nuclear Research
L.N. Gumilyov Eurasian National University
Palacky University Olomouc
Heavy Ion Science and Technology Key Laboratory
School of Nuclear Science and Technology
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