A study of the 127I(n, γ)128I and 133Cs(n, γ)134Cs reactions

The capture γ-ray spectra of the 127I(n, γ)128I and 133Cs(n, γ)134Cs reactions have been investigated using a Ge(Li) spectrometer. A total of 184 high- and low-energy γ-rays were observed for the 127I(n, γ)128I reaction. A neutron separation energy of 6826±3 keV was deduced by means of coincidence experiments. For the 133Cs(n, γ)134Cs reaction 86 γ-rays were observed. Both spectra show an enhancement of high energy intensity which appears to be related to a high level density at low excitation energy.