Precise widths of the 3089 and 3684 keV levels inC13

Abstract
The widths of the 3089 keV and the 3684 keV levels in C13 are precisely measured using nuclear self-absorption and employing amorphous C13 absorbers and scatterers. The role of the effective temperature of carbon is discussed in some detail. The result for the 3089 keV level was found to be larger by about 25% than the compiled value.