  The status of experiments on determination of level density and partial
widths of the nuclear reaction products emission in diapason of nucleon binding
energy is presented. There are analyzed the sources and magnitude of probable
systematical uncertainties of their determination. The maximally achievable
precision of these parameters is estimated, as well. There is considered
ability of new method for determination of distribution parameters of neutron
resonances reduced widths in order to distinguish their groups with the same
structure of wave functions. It was obtained in both cases that the
insufficient value of maximally achievable precision of the parameters of the
experimental data analysis does not allow one to obtain reliable and detailed
information on the studied nuclear properties -- its entropy, strength
functions of nuclear products emission and dominant level structure above
0.5Bn.

Nuclear Experiment