Abstract
The proton and deuteron pickup reactions \({}^{2}\textrm{H}({}^{10}\textrm{Be},{}^{3}\textrm{He}){}^{9}\textrm{Li}\) and \({}^{2}\textrm{H}({}^{10}\textrm{Be},{}^{4}\textrm{He}){}^{8}\textrm{Li}\) were studied with the \({}^{10}\textrm{Be}\) radioactive beam produced by the new fragment separator ACCULINNA-2 at FLNR, JINR. These measurements were initially motivated as the test reactions intended for the elucidation of results obtained in the study of the extremely neutron-rich \({}^{7}\)H and \({}^{6}\)H systems created in the \({}^{2}\textrm{H}({}^{8}\textrm{He},{}^{3}\textrm{He}){}^{7}\textrm{H}\) and \({}^{2}\textrm{H}({}^{8}\textrm{He},{}^{4}\textrm{He}){}^{6}\textrm{H}\) reactions with the use of the same setup. In the \({}^{2}\textrm{H}({}^{10}\textrm{Be},{}^{3}\textrm{He}){}^{9}\textrm{Li}\) reaction the \({}^{9}\)Li ground-state (\(3/2^{-}\)) and its first excited state (2.69 MeV, \(1/2^{-}\)) were identified in the low-energy region of its excitation spectrum. The differential cross sections for the \({}^{9}\textrm{Li}_{\text{g.s.}}\) population were extracted at the forward center-of-mass angles (\(3^{\circ}{-}13^{\circ}\)) and compared with the FRESCO calculations. Spectroscopic factor of \({\sim}1.7\), derived by a model suggesting the \({}^{10}\textrm{Be}=p+{}^{9}\textrm{Li}_{\text{g.s.}}\) clustering was found in accord with the experimental data. The energy spectrum of \({}^{8}\)Li populated in the \({}^{2}\textrm{H}({}^{10}\textrm{Be},{}^{4}\textrm{He}){}^{8}\textrm{Li}\) reaction shows the strong peak which corresponds to the excitation of the second excited state of \({}^{8}\)Li (2.25 MeV, \(3^{+}\)). The fact that the ground and the first excited states of \({}^{8}\)Li were not observed in this reaction is consistent with the shell-model structure of the nuclei involved.
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Funding
This work was partly supported by the Russian Science Foundation grant no. 22-12-00054. One of the authors, I. A. M., was supported by the Student Grant Foundation of the Silesian University in Opava, Grant no. SGF/2/2020, which was realized within the EU OPSRE project entitled ‘‘Improving the quality of the internal grant scheme of the Silesian University in Opava’’, no. CZ.02.2.69/0.0/0.0/19 073/00116951. We acknowledge the interest and support of this activity from Prof. Yu.Ts. Oganessian and Prof. S.N. Dmitriev.
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Nikolskii, E.Y., Krupko, S.A., Muzalevskii, I.A. et al. Study of Proton and Deuteron Pickup Reactions \({}^{{2}}\textrm{H}{(}{}^{{10}}\textrm{Be},{}^{{3}}\textrm{He}{)}{}^{{9}}\textrm{Li}\) and \({}^{{2}}\textrm{H}{(}{}^{{10}}\textrm{Be},{}^{{4}}\textrm{He}{)}{}^{{8}}\textrm{Li}\) with 44 \(\boldsymbol{A}\) MeV \({}^{{10}}\)Be Radioactive Beam at ACCULINNA-2 Fragment Separator. Phys. Atom. Nuclei 86, 923–930 (2023). https://doi.org/10.1134/S1063778824010381
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DOI: https://doi.org/10.1134/S1063778824010381