Gamma-ray Strength Functions in Thermally Excited Rotating Nuclei
نویسندگان
چکیده
A general discussion and illustration is given of strength functions for rotational transitions in two-dimensional Eγ1 × Eγ2 spectra. Especially, a narrow component should be proportional to the compound damping width, related to the mixing of basis rotational bands into compound bands with fragmented transition strength. Three Eγ1 × Eγ2 spectra are made by setting gates on triple coincidences, selecting cascades which feed into specific low-lying bands in the nucleus Hf. In each of the gated spectra, we find a ridge, carrying about 100 decay paths. This ridge is ascribed to rotational transitions in the excitation energy range of 1.0 to 1.5 MeV above the yrast line. The FWHM of the ridges are around 40 keV, about a factor of two smaller than calculated on the basis of mixed cranked mean field bands.
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