Abstract
From an experimental study of the direct capture process in the 17O(p, )18F reaction, the reduced proton widths of the states near the proton threshold are found to be at least a factor of 60 smaller than the previously assumed values. These results imply a corresponding reduction of the stellar reaction rate for the 17O(p, a)24N reaction. Since the new upper limit for this reaction rate is of the same order as that for the 170(p, )18F reaction, a significant part of the hydrogen-burning process of 170 proceeds through the latter reaction, which creates 180 after the + decay of 18F. Subsequent hydrogen burning of iSO proceeds predominantly (> 99%) through the reaction 28O(p, a)15N. Therefore, the CNO cycle involves two side cycles 17ON; and in addition to the main CN cycle. Subject heading: nucleosynthesis
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