Neutron capture of 30Si Original Research Article

At the Karlsruhe and Tübingen 3.75 MV Van de Graaff accelerators the cross section of the reaction 30Si(n,γ)31Si(2.62 h) was measured by the activation technique via the β spectrum of the 31Si-decay. Natural silicon samples of 50 to 90 μm thickness were irradiated back to back with gold foils which served as capture standard. Neutrons were generated using the 7Li(p,n) and T(p,n) reactions. The capture cross section was measured at the neutron energies 25, 30, 52, 104, 149, 180, and 215 keV, respectively. The data have been interpreted with the help of DWBA calculations. We find that the measured cross sections are strongly determined by direct capture and that resonant contributions have been overestimated previously.