First experiment at the Super Heavy Element Factory: High cross section of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Mc</mi><mprescripts></mprescripts><none></none><mn>288</mn></mmultiscripts></math> in the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi>Am</mi><mprescripts></mprescripts><none></none><mn>243</mn></mmultiscripts><mo>+</mo><mmultiscripts><mi>Ca</mi><mprescripts></mprescripts><none></none><mn>48</mn></mmultiscripts></mrow></math> reaction and identification of the new isotope <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Lr</mi><mprescripts></mprescripts><none></none><mn>264</mn></mmultiscripts></math>

Yu. Ts. Oganessian; V. K. Utyonkov; N. D. Kovrizhnykh; F. Sh. Abdullin; S. N. Dmitriev; D. Ibadullayev; M. G. Itkis; D. A. Kuznetsov; O. V. Petrushkin; A. V. Podshibiakin; A. N. Polyakov; A. G. Popeko; R. N. Sagaidak; L. Schlattauer; I. V. Shirokovski; V. D. Shubin; M. V. Shumeiko; D. I. Solovyev; Yu. S. Tsyganov; A. A. Voinov; V. G. Subbotin; A. Yu. Bodrov; A. V. Sabel'nikov; A. V. Khalkin; V. B. Zlokazov; K. P. Rykaczewski; T. T. King; J. B. Roberto; N. T. Brewer; R. K. Grzywacz; Z. G. Gan; Z. Y. Zhang; M. H. Huang; H. B. Yang

doi:10.1103/PhysRevC.106.L031301

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First experiment at the Super Heavy Element Factory: High cross section of ${}^{288}{Mc}$ in the ${}^{243}{Am} + {}^{48}{Ca}$ reaction and identification of the new isotope ${}^{264}{Lr}$

Yu. Ts. Oganessian¹, V. K. Utyonkov ^1,*, N. D. Kovrizhnykh¹, F. Sh. Abdullin¹, S. N. Dmitriev¹, D. Ibadullayev^1,2, M. G. Itkis¹, D. A. Kuznetsov¹, O. V. Petrushkin¹ et al.

A. V. Podshibiakin¹, A. N. Polyakov¹, A. G. Popeko¹, R. N. Sagaidak¹, L. Schlattauer^1,3, I. V. Shirokovski^1,†, V. D. Shubin¹, M. V. Shumeiko¹, D. I. Solovyev¹, Yu. S. Tsyganov¹, A. A. Voinov¹, V. G. Subbotin¹, A. Yu. Bodrov¹, A. V. Sabel'nikov¹, A. V. Khalkin¹, V. B. Zlokazov¹, K. P. Rykaczewski⁴, T. T. King⁴, J. B. Roberto⁴, N. T. Brewer^4,‡, R. K. Grzywacz^4,5, Z. G. Gan⁶, Z. Y. Zhang⁶, M. H. Huang⁶, and H. B. Yang^1,6

¹Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation
²L.N. Gumilyov Eurasian National University, 010000 Nur-Sultan, Kazakhstan
³Palacky University Olomouc, Department of Experimental Physics, Faculty of Science, 771 46 Olomouc, Czech Republic
⁴Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁵Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁶Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

^*utyonkov@jinr.ru
^†Deceased.
^‡Current address: Premise Health, Brentwood, Tennessee 37027, USA.

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Phys. Rev. C 106, L031301 – Published 29 September, 2022

DOI: https://doi.org/10.1103/PhysRevC.106.L031301

Abstract

We present results of the first experiment aimed at the synthesis of Mc isotopes in the ${}^{243}{Am} + {}^{48}{Ca}$ reaction performed at the new gas-filled separator DGFRS-2 online to the new cyclotron DC280 at the Super Heavy Element Factory at JINR. Fifty-five new decay chains of ${}^{288}{Mc}$ and six chains assigned to ${}^{289}{Mc}$ were detected. The $α$ decay of ${}^{268}{Db}$ with an energy of 7.6–8.0 MeV, half-life of $16_{- 4}^{+ 6} h$ , and a branch of $55_{- 15}^{+ 20} %$ was registered for the first time, and a new spontaneously fissioning isotope ${}^{264}{Lr}$ with a half-life of $4 . 9_{- 1.3}^{+ 2.1} h$ was identified. The cross section for the ${}^{243}{Am} ({}^{48}{Ca}, 3 n) {}^{288}{Mc}$ reaction was measured to be $17 . 1_{- 4.7}^{+ 6.3}$ pb, which is the largest value for the known superheavy nuclei at the island of stability.

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Super Heavy Element Factory Releases First Results

Published 29 September, 2022

Initial findings of the Super Heavy Element Factory—an atom smasher in Russia—reveal details about some of the heaviest known elements.

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First experiment at the Super Heavy Element Factory: High cross section of ${}^{288}{Mc}$ in the ${}^{243}{Am} + {}^{48}{Ca}$ reaction and identification of the new isotope ${}^{264}{Lr}$

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First experiment at the Super Heavy Element Factory: High cross section of Mc288 in the Am243+Ca48 reaction and identification of the new isotope Lr264

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First experiment at the Super Heavy Element Factory: High cross section of ${}^{288}{Mc}$ in the ${}^{243}{Am} + {}^{48}{Ca}$ reaction and identification of the new isotope ${}^{264}{Lr}$