First experiment at the Super Heavy Element Factory: High cross section of Mc<mml:mprescripts/><mml:none/>288 in the Am<mml:mprescripts/><mml:none/>243+Ca<mml:mprescripts/><mml:none/>48 reaction and identification of the new isotope Lr<mml:mprescripts/><mml:none/>264

2022/09/29 by Yu. Ts. Oganessian, V. K. Utyonkov, N. D. Kovrizhnykh +31 · 2 citations
Physics and Astronomy · #Nuclear physics research studies #Astronomical and nuclear sciences #Atomic and Molecular Physics

paper · doi:10.1103/physrevc.106.l031301

openalex publication_date 2022/09/29 · openalex created_date 2022/10/01 · openalex updated_date 2026/08/03

Abstract

Here, we present results of the first experiment aimed at the synthesis of Mc isotopes in the ²⁴³Am+⁴⁸Ca 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 ²⁸⁸Mc and six chains assigned to ²⁸⁹Mc were detected. The α decay of ²⁶⁸Db with an energy of 7.6–8.0 MeV, half-life of 16⁺⁶_-4h, and a branch of 55⁺²⁰_-15% was registered for the first time, and a new spontaneously fissioning isotope ²⁶⁴Lr with a half-life of 4.9^+2.1_-1.3h was identified. The cross section for the ²⁴³Am(⁴⁸Ca,3n)²⁸⁸Mc reaction was measured to be 17.1^+6.3_-4.7 pb, which is the largest value for the known superheavy nuclei at the island of stability.

Citations

• Heaviest nuclei from48Ca-induced reactions
• The AME2016 atomic mass evaluation (II). Tables, graphs and references

Cited by

• Dubnium [wikipedia]
• Island of stability [wikipedia]