N. Özkan

OddpisotopeIn113: Measurement ofα-induced reactions

One of the few p nuclei with an odd number of protons is {sup 113}In. Reaction cross sections of {sup 113}In({alpha},{gamma}){sup 117}Sb and {sup 113}In({alpha},n){sup 116}Sb have been measured with the activation method at center-of-mass energies between 8.66 and 13.64 MeV, close to the astrophysically relevant energy range. The experiments were carried out at the cyclotron accelerator of ATOMKI. The activities were determined by off-line detection of the decay {gamma} rays with a HPGe detector. Measured cross sections and astrophysical S factor results are presented and compared with statistical model calculations using three different {alpha}+nucleus potentials. The comparison indicates that the standard rates used in the majority of network calculations for these reactions were too fast due to the energy dependence of the optical {alpha} potential at low energy.

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

Background: The ratio between the rates of the reactions

Alpha-induced reaction cross section measurements on

{}^{17}

^{151}

O

Eu for the astrophysical

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

\gamma

Ne and

-process

{}^{17}

Measurements of

O

^{152}

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

Gd(

Ne determines whether