Investigation of reactions with <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ti</mi><mprescripts></mprescripts><none></none><mn>50</mn></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Cr</mi><mprescripts></mprescripts><none></none><mn>54</mn></mmultiscripts></math> for the synthesis of new elements

Yu. Ts. Oganessian; V. K. Utyonkov; F. Sh. Abdullin; S. N. Dmitriev; D. Ibadullayev; M. G. Itkis; A. V. Karpov; N. D. Kovrizhnykh; D. A. Kuznetsov; O. V. Petrushkin; A. V. Podshibiakin; A. N. Polyakov; A. G. Popeko; R. N. Sagaidak; V. V. Saiko; L. Schlattauer; V. D. Shubin; M. V. Shumeiko; D. I. Solovyev; Yu. S. Tsyganov; A. A. Voinov; V. G. Subbotin; A. V. Sabelnikov; D. Abdusamadzoda; A. Yu. Bodrov; M. G. Voronyuk; G. A. Bozhikov; N. V. Aksenov; A. V. Khalkin; Z. G. Gan; Z. Y. Zhang; M. H. Huang; H. B. Yang; J. G. Wang; M. M. Zhang; X. Y. Huang

doi:10.1103/k2g4-5k7x

Investigation of reactions with ${}^{50}{Ti}$ and ${}^{54}{Cr}$ for the synthesis of new elements

Yu. Ts. Oganessian¹, V. K. Utyonkov ^1,*, F. Sh. Abdullin ¹, S. N. Dmitriev¹, D. Ibadullayev ^1,2, M. G. Itkis ¹, A. V. Karpov ¹, N. D. Kovrizhnykh ¹, D. A. Kuznetsov¹ et al.

O. V. Petrushkin¹, A. V. Podshibiakin¹, A. N. Polyakov¹, A. G. Popeko ¹, R. N. Sagaidak¹, V. V. Saiko ¹, L. Schlattauer ^1,3, V. D. Shubin¹, M. V. Shumeiko ¹, D. I. Solovyev ¹, Yu. S. Tsyganov¹, A. A. Voinov ¹, V. G. Subbotin¹, A. V. Sabelnikov ¹, D. Abdusamadzoda ¹, A. Yu. Bodrov¹, M. G. Voronyuk¹, G. A. Bozhikov¹, N. V. Aksenov ¹, A. V. Khalkin¹, Z. G. Gan⁴, Z. Y. Zhang ⁴, M. H. Huang ⁴, H. B. Yang ⁴, J. G. Wang ⁴, M. M. Zhang ^1,4, and X. Y. Huang^1,4,5

¹Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation
²L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan
³Palacky University Olomouc, Department of Experimental Physics, Faculty of Science, 771 46 Olomouc, Czech Republic
⁴Heavy Ion Science and Technology Key Laboratory, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
⁵School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

^*Contact author: utyonkov@jinr.ru

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Phys. Rev. C 112, 014603 – Published 1 July, 2025

DOI: https://doi.org/10.1103/k2g4-5k7x

Abstract

The ${}^{238}U ({}^{54}{Cr}, 4 n) {}^{288}{Lv}$ and ${}^{242}{Pu} ({}^{50}{Ti}, 3 n – 4 n) {}^{288, 289}{Lv}$ 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 ${}^{288}{Lv}$ with α-particle energy $E_{α} = 11.08$ MeV and half-life $T_{1 / 2} = 2.0$ ms, ${}^{289}{Lv}$ with $E_{α} = 10.90$ MeV, $T_{1 / 2} = 2.4$ ms, and granddaughter of ${}^{288}{Lv}$ , spontaneously fissioning ${}^{280}{Cn}$ with $T_{1 / 2} = 10 µ s$ , which was observed after the first registration of α decay of ${}^{284}{Fl}$ with $E_{α} = 10.57$ MeV. Besides, for the first time we reliably registered the pxn channel of the ${}^{242}{Pu} + {}^{50}{Ti}$ reaction which was not evidently observed in the ${}^{48}{Ca}$ -induced reactions in previous studies. The cross sections of the $3 n$ and $4 n$ channels of the ${}^{242}{Pu} + {}^{50}{Ti}$ reaction of ${0.32}_{- 0.18}^{+ 0.34}$ pb and ${0.22}_{- 0.15}^{+ 0.27}$ pb, respectively, were measured at excitation energy of the ${}^{292}{Lv}$ compound nucleus $E^{*} = 41$ MeV. The cross section of the $4 n$ -evaporation channel of the ${}^{238}U + {}^{54}{Cr}$ reaction, leading to the same compound nucleus, at $E^{*} = 42$ MeV of $32_{- 24}^{+ 46}$ fb turned out to be approximately 15 times lower than the total cross section of the ${}^{242}{Pu} + {}^{50}{Ti}$ 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 ${}^{50}{Ti}$ are, by an order of magnitude, preferable to reactions with ${}^{54}{Cr}$ for the synthesis of new elements 119 and 120.

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Investigation of reactions with ${}^{50}{Ti}$ and ${}^{54}{Cr}$ for the synthesis of new elements

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Investigation of reactions with Ti50 and Cr54 for the synthesis of new elements

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Investigation of reactions with ${}^{50}{Ti}$ and ${}^{54}{Cr}$ for the synthesis of new elements