Investigation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ca</mml:mi><mml:mprescripts/><mml:none/><mml:mn>48</mml:mn></mml:mmultiscripts></mml:math>-induced reactions with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts/><mml:none/><mml:mn>242</mml:mn></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts/><mml:none/><mml:mn>238</mml:mn></mml:mmultiscripts></mml:math> targets at the JINR Superheavy Element Factory
Yu. Ts. Oganessian, V. K. Utyonkov, D. Ibadullayev, F. Sh. Abdullin, S. N. Dmitriev, М. Г. Иткис, А. В. Карпов, N. D. Kovrizhnykh, D. A. Kuznetsov, O. V. Petrushkin, A. V. Podshibiakin, А. N. Polyakov, A. G. Popeko, R. N. Sagaidak, L. Schlattauer, V. D. Shubin, M. V. Shumeiko, D. I. Solovyev, Yu. S. Tsyganov, A. A. Voinov, V. G. Subbotin, A. Yu. Bodrov, A. V. Sabelnikov, Antonin Lindner, K. P. Rykaczewski, T. King, J. B. Roberto, N. T. Brewer, R. Grzywacz, Z. G. Gan, Z. Y. Zhang, M. H. Huang, H. B. Yang
Abstract
Experiments using a <sup>48</sup>Ca beam on <sup>238</sup>U and <sup>242</sup>Pu targets to produce superheavy nuclei were performed at the gas-filled separator DGFRS-2 online to the new cyclotron DC280 at the SHE Factory at JINR. The decay properties of <sup>286</sup>Fl and <sup>287</sup>Fl, as well as their α-decay products, were refined after the detection of 25 and 69 new decay chains, respectively. In addition, 16 decay chains of <sup>283</sup>Cn were observed in the <sup>238</sup>U+<sup>48</sup>Ca reaction. The possibility of existing of isomeric states in the<sup> 287</sup>Fl consecutive α decays is discussed. A new α line with an energy of 100–200 keV lower than the main one at 10.19 MeV was observed for the first time for even-even <sup>286</sup>Fl decay. A maximum cross section of $10.4^{+3.5}_{-2.1}$pb was measured for the <sup>242</sup>Pu(<sup>48</sup>Ca,3n) <sup>287</sup>Fl reaction.