Springer Online Journal Archives 1860-2000
Energy, Environment Protection, Nuclear Power Engineering
Abstract Using a magnetic Compton spectrometer, we measured the spectra of the γ-rays arising from the capture of thermal neutrons by nuclei of gadolinium, erbium, hafnium, dysprosium and tantalum in the energy range 0.3–9 Mev. We determined the energies and the intensities of the γ-lines. For the first three elements, the radiating nuclei are the even-even nuclei64Gd 92 156 ,64Gd 94 158 ,68Er 100 168 and72Hf 106 178 , which have rotational structural levels close to the ground state. The peculiarity of the spectra of these nuclei is the presence of a group of closely placed intense γ-lines with energies of ∼ 1 Mev. These lines are absent in the case of even-odd (for example,66Dy 99 165 ) and odd-odd radiating nuclei (for example,73Ta109 182). The peculiarities of the γ-ray spectra noted are due to the structure of the lower nuclear levels.
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