A study of the emission of gamma rays from excited nuclei is an important means to the identification of the nuclear levels involved. By observations of cascade versus single transitions and the relative probabilities of various modes of de-excitation of different excited levels, the character of these levels can often be derived. With such information, and with other data available from particle group observations, complete decay schemes can be built up, and in some cases unique values of the level parameters can be assigned. A comparison of these results with current nuclear models should lead to a more satisfactory theoretical treatment of the nucleus
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