Rostislav Zezula  
                                   (1969)   
                
                
                    
                        
                            
            The main results of this paper, in which the problem of determination of the fuel concentration distribution  inducing a prescribed thermal neutron flux  in the homogenized critical reactor core with given outer reflector boundary is investigated (in the two-groups diffusion approximation), are stated in the theorems 1 and 2. In theorem 1 sufficient conditions are given for the existence of a oneparametrical family of thermal neutron fluxes induced by the Goertzel’s type fuel concentration...