The problem of how the transition from the simple structure and small density of low excitations to the complex structure and large activity of high excitations occurs seems to remain still unsolved theoretically. This is explained by the fact that the structure of intermediate and highly excited states is unknown and there is no unified nuclear theory. By tradition, the lower part of the spectrum is described, e.g., in the framework of the super-fluid nuclear model /l/ while highly excited states are treated by the statistical model /2/.
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