CORRELATION CHARACTERISTICS OF THE 20Ne(2+, 1.634 MeV) NUCLEUS, FORMED IN THE 19F(α, t)20Ne REACTION AT 𝐸α = 30.3 MeV

The differential cross sections of the 19F(α, t)20Ne(g. s., 2+, 4+) reaction studied at the cyclotron of the MSU Institute of Nuclear Physics, tg-angular correlations in the reaction 19F(α, t)20Ne(2+) at the energy Eα = 30.3 MeVand the tensors of the orientation of the multipole moments and the alignments Fk(θt) of the 20Ne(2+) nucleus reconstructed on their basis are compared with the calculated ones under the assumption of a direct mechanism of proton stripping taking into account the coupling of channels using the Coupled Сhannels Born approximation. A set of calculation parameters necessary for such a reaction mechanism is established and their specific values are determined. The calculated differential cross sections of the reaction 19F(α, t)20Ne for all states of the rotational band agree with the experimental ones at θt < 120∘, where the direct mechanism makes the main contribution. In the same region of θt the calculated F2(θt) and F4(θt) of the 20Ne(2+) nucleus agree satisfactorily with the experimental ones. It was found that their value at θt < 120∘ is small, so the isotropy of the spin distribution in 20Ne(2+) is not violated. At large angles θt both the experimental and calculated values of F4 are about 0.5, that indicates a partial violation of this isotropy.

ядерные реакции, срыв протона, угловые корреляции