Gamma-Ray Spectra of Co60 and Mn56 Following Resonance-Neutron Capture in Co59 and Mn55

The gamma-ray spectra resulting from neutron capture in the 132-eV resonance of Co59 and the 336-, 1098-, and 2355-eV resonances of Mn55 have been observed with a Ge(Li) spectrometer at the Argonne fast-chopper time-of-flight system. The spectra are compared with the thermal-capture spectra and with the proton spectra observed in deuteron stripping. The reduced gamma-ray width for transitions in Co60 exhibit a dependence on the ln value of the …