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The level density of compound resonances observed at neutron separation energy is subject of closer investigation and interpretation. The structures in the level density parameter as a function of the mass number allow the determination of the hierarchy of the compound states and the definition of a base line which represents the level density parameter of spherical nuclei with no residual interaction and no shell effects. Using the base line a method becomes available enabling the separation of the residual interaction from properties of the average potential defined in the framework of the shell model. The following examples in different mass regions are discussed: the change of the pairing energy due to the blocking effect at A about 70; the breakdown of the pairing correlations at A about 105 is interpreted as neutron - proton interaction; similar effects in the mass region 150 < A < 170 are discussed with neutron - proton interaction and the backbending phenomenon. Finally it will be shown that there is no enhancement of states due to collective properties of nuclei at high excitation energy.

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Bibliographic Reference: Z. PHYS. A - ATOMS AND NUCLEI, VOL. 318 (1984), PP. 299-308
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