New Maxwellian averaged neutron capture cross sections for Cl-35,Cl-37

The Oak Ridge Electron Linear Accelerator (ORELA) was used to measure neutron total and capture cross sections of natural chlorine in the energy range from 100 eV to 600 keV. We performed an R-matrix analysis of our new capture and transmission data up to 500 keV. From these resonance parameters new (n, gamma) astrophysical reaction rates were determined over the entire energy range needed by the latest stellar models of the s process.