حسین فالی نژاد

Nuclear level density feature is unique for each nucleus that its importance and application to be included of range of fields. Many experimental and theoretical efforts have been made in the field of nuclear level density analysis which led to the introduction of different models that each of these models has its own problems. Another important issue in the level density is collective amplitude. Nuclear coherent collective excitation causes an increase in level density and has a important role in the low energy region by increasing excitation energy before damping. In this thesis, we consider the cumulative effects of a very important parameter in level density, by means of compliance with experimental data, we obtain the level density parameter. Then by using level density parameter obtain in theory and fitting this values we calculate the number of nuclear states and then we comparing this with experimental values and through this we present the Laplace distribution of level density parameter in terms of energy by like Laplace formula.