Abstract
Experimental spectroscopic factors of the alpha-transfer reaction on nuclei of the sd-shell show rather strong inconsistencies and scatter much more strongly than explainable by the quoted errors. The poorer the quality of agreement between experimental and theoretical angular distribution shapes, the more inconsistent the comparison of spectroscopic factors either between different experiments or between theory and experiment. In view of the strong deformation of nuclei in the lower part of the sd-shell, higher-order reaction mechanisms are expected. A coupled-reaction-channel analysis for the transitions to the 0 +, 2 +, and 4 + states of the ground-state bands in 20Ne and 22Ne excited via the (d, 6Li) reaction yields good agreement between experimental and theoretical angular distribution shapes as well as spectroscopic information.
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