Speaker
Description
At FLNR JINR experiments are carried out to investigate the radioactive decay properties (α, β, γ spectroscopy) and the cross section measurements of transfermium elements synthesised in the fusion-evaporation reaction of an accelerated heavy ion beam with target nuclei using the kinematic separator SHELS [1,2] at the cyclotron U-400 and the gas-filled separator GRAND, located at the Factory of Superheavy Elements. A number of experiments have been devoted to the study of the radioactive decay properties of No and Rf and their daughter nuclei. No and Rf isotopes are produced as a result of the evaporation of one to four neutrons from compound nuclei in the reactions of $^{204}$Pb($^{48}$Ca,(1–3)$\textit{n}$)$^{251,250,249}$No [3,4], $^{238}$U($^{22}$Ne,4$\textit{n}$)$^{256}$No [5], $^{204}$Pb($^{50}$Ti,1$\textit{n}$)$^{253}$Rf [6], $^{207}$Pb($^{50}$Ti,2$\textit{n}$)$^{255}$Rf [7], $^{208}$Pb($^{50}$Ti, 1$\textit{n}$)$^{257}$Rf [8], respectively. These transfermium isotopes have sufficiently high production cross sections to allow us to collect good statistics for the study of decay properties by methods of α, β, and γ spectroscopy. No and Rf isotopes are interesting because of the possibility to study changes in radioactive decay properties around the neutron subshell N=152, which could provide data necessary to understand how the properties of heavy element isotopes behave in the region of the neutron subshell N=162.
References
1. Yeremin A. et al. First experimental tests of the kinematic separator SHELS (Separator for Heavy ELement Spectroscopy). // EPJ Web Conf. 2015. Vol. 86. P. 4–6.
2. Yeremin A. V. et al. Experimental tests of the modernized VASSILISSA separator (SHELS) with the use of accelerated 50Ti ions // Phys. Part. Nucl. Lett. 2015. Vol. 12, № 1. P. 43–47.
3. Svirikhin A.I. et al. The New 249No Isotope // Phys. Part. Nucl. Lett. 2021. Vol. 18, № 4. P. 445–448.
4. Tezekbayeva M.S. et al. Study of the production and decay properties of neutron-deficient nobelium isotopes // Eur. Phys. J. A. Springer Berlin Heidelberg, 2022. Vol. 58, № 3.
5. Kessaci K. et al. Evidence of high-K isomerism in 256No // Phys. Rev. C. 2021. Vol. 104, № 4. P. 044609:1-6.
6. Lopez-Martens A. et al. Fission properties of Rf 253 and the stability of neutron-deficient Rf isotopes // Phys. Rev. C. 2022. Vol. 105, № 2. P. 1–5.
7. Chakma R. et al. Investigation of isomeric states in Rf 255 // Phys. Rev. C. 2023. Vol. 107, № 1. P. 1–11.
8. Hauschild K. et al. Alpha-decay spectroscopy of 257 Rf // Eur. Phys. J. A. Springer Berlin Heidelberg, 2022. Vol. 58, № 1. P. 1–7.
| Section | Nuclear structure: theory and experiment |
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