16-S - 33

 16-S - 33 FUJI E.C.  EVAL-MAY87 H.NAKAMURA                       
                      DIST-MAR02 REV3-MAY01            20010517   
----JENDL-3.3         MATERIAL 1628                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
HISTORY                                                           
87-05  Newly evaluated by H.Nakamura (fuji electric co. ltd.)     
94-02  JENDL-3.2                                                  
       New optical model calculation was performed by T. Watanabe 
       (khi).                                                     
       Data were compiled by K. Shibata (jaeri).                  
       *****  modified parts for JENDL-3.2 ******************     
       (3,1),(3,4),(3,51-57),(3,91),(3,251),(4,2),(4,51-57)       
               optical and statistical model calculations.        
       (3,2)   total - nonelastic                                 
       *******************************************************    
01-04  JENDL-3.3                                                  
       Gamma-ray production data were evaluated and compiled      
       by K. Shibata                                              
*****  modified parts for JENDL-3.3 ****************************  
(1,451)            Updated                                        
(3,251)            Deleted.                                       
(4,2)              Transformation matrix deleted.                 
(5,16-91)          INT=22.                                        
(12,16-107)        Added.                                         
(14,16-107)        Added.                                         
(15,16-107)        Added.                                         
****************************************************************  
                                                                  
 mf=1 General information                                         
      mt=451  Descriptive data and dictionary                     
                                                                  
 mf=2 mt=151  Resonance parameters:                               
      Resolved resonances for MLBW formula: 1.0e-5 eV - 260 keV   
     Parameters are taken from BNL325 4th edition/1/, and         
     C.Wagemans and H.Weigmann/2/.                                
      Cross sections calculated with these parameters are to      
     be corrected adding mf=3, mt=1, 2 and 102 data.              
                                                                  
     calculated 2200-m/s cross sections and resonance integrals   
                                                                  
                  2200-m/sec     res. integ.       ref.           
       elastic       2.84 b          -             /1/            
       capture       0.35 b        0.164 b         /1/            
       total         3.36 b          -              -             
                                                                  
 mf=3 Neutron cross sections                                      
    Below 260 keV                                                 
      Background cross sections are given for mt=1:               
      mt=1 0.171b : 0.002(n,p) + 0.169(n,a) b                     
      mt=103 (n,p) 0.0016 b, based on 2200-m/s data /1/.          
      mt=107 (n,a) 0.169 b, same to the above.                    
    Above 260 keV                                                 
      mt=1,2,4,51-57,91,102                                       
          Total, elastic, inelastic and capture cross sections    
         calculated with casthy code /3/, considering the         
         competition with the threshold reaction channels.        
         Optical potential parameters of C.Y.Fu/4/ are adjusted   
         to reproduce the following experimental data:            
             mt=1 total  -                                        
             mt=2 elastic cross sections of s-32.                 
             mt=4 inelastic   -                                   
          The spherical optical potential parameters :            
             V = 38.0     Vso= 5.37   (MeV)                       
             Ws= 9.13     Wv = 0.0    (MeV)                       
             r=rso= 1.26  rs = 1.39   (fm)                        
             a=aso= 0.76  b  = 0.40   (fm)                        
          mt=102 capture data are normalized to 0.5 mb at 260 keV 
         based on s-32 capture cross sections.                    
          The discrete level scheme taken from ref./5/:           
             no.      energy(MeV)     spin-parity                 
            (g.s.)       0.0           3/2    +                   
              1          0.8404        1/2    +                   
              2          1.966         5/2    +                   
              3          2.313         3/2    +                   
              4          2.866         5/2    +                   
              5          2.934         7/2    -                   
              6          2.969         7/2    +                   
              7          3.220         3/2    -                   
          Continuum levels are assumed above 3.6MeV. The level    
         density parameters of Asano et al./6/ are used.          
     *****  JENDL-3.2 ****************************************    
     mt=1,4,51-57,91,251                                          
       Optical and statistical model calculation                  
       was performed by using the omp set given as follows:       
              V  = 58.83 - 0.5635En     (MeV)                     
              Ws = 3.609 + 0.1819En     (MeV)                     
              Vso= 4.199                (MeV)                     
              r  = 1.306,  a  = 0.452    (fm)                     
              rs = 1.124,  b  = 0.690    (fm)                     
              rso= 1.010,  aso= 0.750    (fm).                    
     *********************************************************    
      mt=16(n,2n), 22(n,n'a),28(n,n'p),103(n,p),107(n,a)          
          Based on the statistical model calculations with gnash  
         code /7/, without the precompound reaction correction.   
         Transmission coefficients for proton and alpha particles 
         are calculated by using the omp of becchetti-geenlees/8/ 
         and huizenga-igo/9/, respectively.                       
          Level density parameters are based on built-in values.  
                                                                  
 mf=4  Angular distributions of secondary neutrons                
      mt=2  Calculated with optical model (casthy).               
      mt=51-57  Calculated with hauser-feshbach formula (casthy)  
      mt=16,22,28  Isotropic in the laboratory system.            
      mt=91        Isotropic distributions in cm were converted   
                   to the distributions in lab.                   
                                                                  
 mf=5  Energy distributions of secondary neutrons                 
      mt=16,22,28,91,103,107  evaporation spectra.                
                                                                  
 mf=12 Photon production multiplicities                           
     mt=16,22,28,103,107                                          
       Multiplicities were calculated by using the egnash code    
       /10/.                                                      
     mt=102                                                       
       Multiplicities were calculated by using the casthy code    
       /3/.                                                       
     mt=51-57                                                     
       Transition probability arrays were given.                  
                                                                  
 mf=14 Photon angular distributions                               
     mt=16,22,28,51-57,91,102,103,107                             
       Isotropic                                                  
                                                                  
 mf=15 Continuous photon energy spectra                           
     mt=16,22,28,103,107                                          
       Multiplicities were calculated by using the egnash code    
       /10/.                                                      
     mt=102                                                       
       Multiplicities were calculated by using the casthy code    
       /3/.                                                       
                                                                  
References                                                        
 1) Mughabghab, S.F. et al.: Neutron cross section, Vol.1 (1981). 
 2) Wagemans, C. and Weigman, H.: Grenoble-conf., 462 (1981).     
 3) Igarasi, S.: J. Nucl. Sci. Tech., 12, 67 (1975).              
 4) Fu, C.Y.: Atom.Data and Nucl. Data Tables, 17, 127 (1976).    
 5) Ledrer, C.M. et al.: Table of isotopes. 7th edit.             
 6) Asano et al.: private communication.                          
 7) Young, P.G. and Arthur, E.D.: LA-6947 (1977).                 
 8) Becchetti, Jr. and Greenlees, G.W.: Polarization phenomena    
   in nuclear reactions, p.682 (1971).                            
 9) Huizenga, Jr. and Igo, G.J.: Nucl. Phys., 29, 462 (1962).     
10) Yamamuro, N.: JAERI-M 90-006 (1990).