ENTRY            A0441   20030113
SUBENT        A0441001   20030113                                 
BIB                 14         70                                 
TITLE      Incomplete fusion reactions:  analysis of excitation   
           functions and recoil range distributions in 16-O+51-V  
AUTHOR     (S.Mukherjee, A.Sharma, S.Sodaye, B.S.Tomar, A.Goswami,
           S.B.Manohar)                                           
REFERENCE  (J,EPJ/A,12,199,2001)                                  
INSTITUTE  (3INDIND) School of studies in physics, Vikram         
           university.                                            
           (3INDTRM) Radiochemistry division                      
FACILITY   (VDGT,3INDTRM) BARC-TIFR Pelletron accelerator         
COMMENT    Abstract.  Incomplete fusion reactions were            
           investigated by measuring the excitation functions of  
           nine evaporation residues in 16-O + 51-V reaction in   
           the beam energy 4-6 MeV/amu, using the well-known      
           recoil catcher technique and gamma-ray spectrometry.   
           The experimental data were compared with that obtained 
           from MONTE CARLO simulation calculations using the     
            PACE2 code.  The results indicate the presence of     
           incomplete fusion process in the production of two     
           alpha emission products.  This was further confirmed by
           the measurement of recoil range distribution of these  
           isotopes at 96 MeV beam energy.  Calculations of the   
           average angular momentum associated with these products
           revealed the peripheral nature of these incomplete     
           fusion reactions.                                      
           Special remark by authors.  In case of cobalt products,
           the experimental data are much higher than the         
           calculated data indicating the contribution from       
           incomplete fusion reactions.  These incomplete fusion  
           reactions can be of the 51-V(16-O,8-Be)59-Co* type.    
           The excited 59-Co* nucleus may subsequently de-excite  
           by neutron emission to give 58-56 Co.  In the case of  
           the evaporation residues 61-Co, there may be a breakup 
           of 16-O into 12-C and 4-He and subsequent incomplete   
           fusion of 12-C in the reaction 51-V(16-O,A)63-Cu; the  
           evaporation of two protons leads to the formation of   
           the residues. It was found that the incomplete fusion  
           contributions with respect to the complete fusion      
           cross-sections increase from 3% at 60 MeV to about 20% 
           above 90 MeV.                                          
REL-REF    (R,,L.C.NORTHCLIFFE+,J,AND,7,233,1970) To calculate the
           beam energy degradation in each target foil            
METHOD     (EXTB) The target samples were irradiated with the     
           collimated 16-O beam of diameter 1-2 mm.               
           (STTA) Stacks consisting of two self-supporting targets
           of vanadium, each of thickness 2.1 mg/cm**2 and purity 
           99.99%, approximately, separated by aluminum foils, 2  
           mg/cm**2, approximately.                               
           (ACTIV) Several irradiations were carried out for each 
           such stack of target and degraders to encompass the    
           16-O beam energy between 58 and 94 MeV.                
           (GSPEC) After the irradiation, the target and the      
           catcher foil were counted in the live time mode.       
           The recording time period were chosen in such a way so 
           as to get the good counting statistics.   The duration 
           of counting was initially kept in the order of seconds 
           and subsequently increased to longer periods for       
           counting long-lived products.                          
ANALYSIS   (AREA)                                                 
DETECTOR   (HPGE)                                                 
HISTORY    (20020916C)                                            
           (20030113U) Last checking has been done.               
STATUS     (CURVE) By CAJAD                                       
ADD-RES    (RANGE)                                                
ERR-ANALYS (ERR-T) The uncertainties are shown on figures. The    
           errors on the cross section arise mostly from the      
           counting statistics (1-4%), target thickness (5-8%),   
           detector efficiency (4%), beam fluence (<5%) and       
           gamma-ray intensity values (5-10%)                     
           (EN-ERR) The uncertainty is shown on figure without    
           any details                                            
ENDBIB              70                                            
NOCOMMON                                                          
ENDSUBENT           73