بلوریزاده, محمدآقا,
                            
                        
                        
                        
            
                    
                    
                    
                        
                            
                                راستپور, قاسم,
                            
                        
                        
                        
            
                    
                    
                    
                        
                            
                                شجاعیاکبرآبادی, فریده,
                            
                        
                        
                        
            
                    
                    
                    
                        
                            
                                
فتحی, رضا,
                            
                            
                        
                        
                        
            
                    
                    
            
                    
 
                    
                     A three-body model is devised to study differential and total cross sections for the excitation of helium atom under impact of energetic protons. The actual process is a four body one but in the present model the process is simplified into a three-body one. In this model, an electron of helium atom is assumed to be inactive and only one electron of the atom is active. Therefore, the active ele...