Abstract
The differential cross sections of the \({}^{19}\) F( \(\alpha\) , \(t\) ) \({}^{20}\) Ne(g. s., 2 \({}^{+}\) , 4 \({}^{+}\) ) reaction studied at the cyclotron of the Skobeltsyn Institute of Nuclear Physics, \(t\gamma\) angular correlations in the reaction \({}^{19}\) F( \(\alpha\) , \(t\) ) \({}^{20}\) Ne(2 \({}^{+}\) ) at the energy \(E=30.3\) MeV, and the tensors of the orientation \(t_{k\kappa}(\theta_{t})\) of the multipole moments and the alignments \(F_{k}\) ( \(\theta_{t}\) ) of the \({}^{20}\) Ne(2 \({}^{+}\) ) nucleus reconstructed on their basis are compared with the calculated values under the assumption of a direct mechanism of proton stripping taking into account the coupling of channels using the Coupled-Channels Born Approximation method. A set of calculation parameters necessary for such a reaction mechanism was established and their specific values were determined. The calculated differential cross sections of the reaction \({}^{19}\) F( \(\alpha\) , \(t\) ) \({}^{20}\) Ne for all states of the rotational band agree with the experimental ones at \(\theta_{t}<120^{\circ}\) , where the direct mechanism makes the main contribution. In the same region of \(\theta_{t}\) , \(t_{k\kappa}(\theta_{t})\) the calculated \(F_{2}\) ( \(\theta_{t}\) ) and \(F_{4}\) ( \(\theta_{t}\) ) of the \({}^{20}\) Ne(2 \({}^{+}\) ) nucleus agree satisfactorily with the experimental data. It was found that their value at \(\theta_{t}<120^{\circ}\) is small, so the isotropy of the spin distribution in \({}^{20}\) Ne(2 \({}^{+}\) ) is not violated. At large angles \(\theta_{t}\) , both the experimental and calculated values of \(F_{4}\) are approximately 0.5, which indicates a partial violation of this isotropy.
