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 15692 ,64Gd 15894 ,68Er 168100 and72Hf 178106 , 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 16599 ) 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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Groshev, L.V., Demidov, A.M., Lutsenko, V.N. et al. γ-ray spectra from the radiation capture of neutrons for even-even radiating nuclei with rotational levels. The Soviet Journal of Atomic Energy 4, 1–18 (1958). https://doi.org/10.1007/BF01514555
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DOI: https://doi.org/10.1007/BF01514555