Neutron-capture reactions with the R3B-CaveC setup

Recent research has shown that the (n,γ) transition-rates on light nuclei can have an influence on the neutron-balance during the r-process. Especially neutron rich carbon isotopes play an important role in r-process nucleosynthesis network calculations which include light nuclei, since these nuclei are aligned along major flow-paths. In particular 18C is of interest, because it can be interpreted as a waiting point. The 17C(n,γ)18C rate could so far only be estimated theoretically and has an uncertainty of a factor of ten. At the R3B-CaveC setup at GSI we have measured the (n,γ) time reversed reaction, i.e. 18C(γ,n)17C for the above mentioned nucleus, via the Coulomb-breakup of 18C beam. The kinematically complete measurement allows extracting the energy dependent neutron-capture cross section with respect to the excitation energy by using the invariant-mass method. Results and the strategy for further analysis will be presented.