Radiative thermal neutron capture by natural sulfur

A high precision study of the gamma ray spectrum following neutron capture by a target of natural sulfur is reported. The energy precision obtained has permitted construction of decay schemes for 33S and 35S. In the case of the former isotope a total of 22 levels have been identified while for the latter and much weaker reaction 7 states have been observed. While some transitions attributable to capture by 33S are observed, their weakness prohibited detailed analysis. The neutron separation energies, based upon the 14N(n, γ)15N standard are found to be 8,641.60(3) keV and 6,985.84(5) keV for 33S and 35S respectively. (orig.)