Abstract
The energy spectra of 6He nuclei from the 90Zr( 6Li, 6He) reaction at E 6Li = 93 MeV have been measured over the angular range of 7 ° ⩽ θ lab ⩽ 20 °. The theoretical DWBA analysis of these spectra and angular distributions was performed employing transition densities of bound and resonance states obtained on the basis of the theory of finite Fermi systems. It is shown that up to excitation energies of E x ≈ 10 MeV in 90Nb a direct charge-exchange mechanism dominates in this reaction, while at higher E x the contribution made by multistep processes increases significantly. It is also shown that the quasi-elastic cross section is determined by a sum of partial contributions of spin-isospin-flip transitions with multipolarities L=0 through L=6.
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