J. Görres

The hot proton-proton chains in low-metallicity objects

The rates for proton- and alpha-capture reactions on light nuclei (A less than or equal to 13) close to the proton drip line are calculated from available nuclear structure information. The influence of these reactions as link reactions between the nuclei in the pp chains and the CNO nuclei in hydrogen burning at different temperatures and densities is discussed. 30 refs.

Measurement of the reaction17O(α,n)20Ne and its impact on thesprocess in massive stars

Background: The ratio between the rates of the reactions

Experimental cross sections of

{}^{17}

{}^{165}

O

Ho

{(\ensuremath{\alpha},n)}^{20}

(\alpha,

Ne and

n

{}^{17}

){}^{168}

O

Tm and

{(\ensuremath{\alpha},\ensuremath{\gamma})}^{21}

{}^{166}

Ne determines whether