Systematic study of (p,$\gamma )$ and ($\alpha $,$\gamma )$ reactions on Nickel isotopes

The stable neutron-deficient isotopes of the elements from Se to Hg are synthesized during so called p-process. The modeling of p-process nucleosynthesis requires a large network of thousands of nuclear reactions involving stable nuclei as well as unstable, proton-rich nuclides. However, there are still very few charged-particle cross sections determined experimentally, despite big experimental efforts in recent years. Thus, the p-process rates involving charged projectiles are still based on theoretical cross sections obtained from modern Hauser--Feshbach statistical model calculations. It is crucial not only to measure cross sections for reactions that were shown to be particularly important for the p-process but also to provide systematic information on the (p,$\gamma )$ and ($\alpha $,$\gamma )$ reactions for nuclei beyond iron in order to put constraints on the theoretical models. Here, the recent investigation of (p,$\gamma )$ and ($\alpha $,$\gamma )$ reactions on stable Nickel isotopes will be presented. The obtained results will be compared to theoretical calculations that are commonly used in astrophysical models.