Study of nuclear reactions relevant for the astrophysical s-process with n-TOF at CERN

Full text: Neutron capture reactions are the main mechanisms for the production of elements heavier than Fe in stellar nucleosynthesis. Recently found disagreements between observed and predicted abundances demonstrate, that our knowledge on nucleosynthesis is still limited and particularly asks for precise capture cross-sections. The neutron time-of-flight facility n-TOF at CERN provides an excellent set-up to measure neutron capture cross-sections because of its high instantaneous neutron flux and low background. In addition, the 200 m flight path available, guarantees a high energy resolution. In view of these features, the n-TOF facility is predestined for precise measurements of interest for s-process nucleosynthesis. Within the n-TOF collaboration, we will measure neutron capture cross sections of Fe and Ni isotopes at n-TOF. These data will be compared with recent results from independent activation measurements using accelerator mass spectrometry. After installation of a new spallation target a new measurement campaign was started in 2009. The present status of neutron-capture reactions will be highlighted. (author)