98-Cf-249

 98-CF-249 JAERI      EVAL-JUL95 T.NAKAGAWA AND T.LIU             
                      DIST-MAR02 REV2-FEB02            20020226   
----JENDL-3.3         MATERIAL 9852                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
HISTORY                                                           
85-03 EVALUATION FOR JENDL-3 WAS MADE BY Y.KIKUCHI AND            
      T.NAKAGAWA (JAERI).  DETAILS ARE GIVEN IN REF. /1/.         
95-07 NEW EVALUATION WAS MADE BY T.NAKAGAWA AND T.LIU.            
00-05 MODIFICATION AND COMPILATION WERE MADE BY T.NAKAGAWA        
                                                                  
     ***** Modified parts from JENDL-3.2 *******************      
     MF=2        Scattering radius in the unresolved resonance    
                 region.                                          
     ALL DATA OF MF'S = 3, 4 AND 5.                               
     *******************************************************      
                                                                  
                                                                  
MF=1  GENERAL INFORMATION                                         
  MT=451   COMMENTS AND DICTIONARY                                
  MT=452   NUMBER OF NEUTRONS PER FISSION                         
      SUM OF MT'S = 455 AND 456.                                  
  MT=455   DELAYED NEUTRON DATA                                   
      SEMI-EMPIRICAL FORMULA BY TUTTLE /2/.                       
  MT=456   NUMBER OF PROMPT NEUTRONS PER FISSION                  
      SEMI-EMPIRICAL FORMULA BY HOWERTON /3/.                     
                                                                  
MF=2,MT=151  RESONANCE PARAMETERS (TAKEN FROM JENDL-3.2)          
  RESOLVED RESONANCES FOR MLBW FORMULA : 1.0E-5 EV TO 70 EV       
    RESONANCE ENERGIES, NEUTRON AND FISSION WIDTHS WERE TAKEN     
    FROM THE EXPERIMENTAL DATA OF BENJAMIN+ /4/.  THE RADIATIVE   
    WIDTH WAS ASSUMED TO BE 0.04 EV ACCORDING TO DABBS+ /5/.      
    A NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE THERMAL 
    CROSS SECTIONS. NO BACKGROUND CORRECTION WAS APPLIED.         
                                                                  
  UNRESOLVED RESONANCES : 70 EV - 30 KEV                          
    OBTAINED FROM OPTICAL MODEL CALCULATION:                      
        S1=3.15E-4, S2=0.83E-4.                                   
    ESTIMATED FROM RESOLVED RESONANCES:                           
        DOBS=1.16 EV, GAM-G=40 MILLI-EV ,S0=1.06E-4               
    FISSION WIDTHS WERE ESTIMATED FROM THE CHANNEL THEORY OF      
    FISSION /6/. S0, S1 AND S2 VALUES WERE ADJUSTED SO AS TO      
    REPRODUCE THE FISSION CROSS SECTION MEASURED BY DABBS+ /5/.   
    Scattering radius of 8.85 fm was determined so as to give the 
    same ealstic scattering cross section above 30 keV.           
                                                                  
  CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS      
                   2200 M/S VALUE           RES. INT.             
      TOTAL        2176.7    B                 -                  
      ELASTIC         6.22   B                 -                  
      FISSION      1666      B               2220  B              
      CAPTURE       504.5    B                695  B              
                                                                  
MF=3  NEUTRON CROSS SECTIONS                                      
  MT=1 TOTAL CROSS SECTION                                        
      CALCULATED WITH CASTHY CODE /7/ BASED ON THE SHERICAL       
      OPTICAL MODEL. THE OPTICAL POTENTIAL OF REF./8/ WERE        
      USED.                                                       
                                                                  
           V = 45.036-0.3*EN                        (MEV)         
           WS= 4.115+0.4*EN                         (MEV)         
           WV= 0             , VSO = 7.5            (MEV)         
           R = RSO = 1.256   , RS  = 1.260           (FM)         
           A = ASO = 0.626   , B   = 0.555+0.0045*EN (FM)         
                                                                  
      COMPETING PROCESSES OF THE FISSION, (N,2N) AND (N,3N) WERE  
      TAKEN INTO ACCOUNT.  THE FOLLOWING LEVEL DENSITY PARAMETERS 
      OF GILBERT-CAMERON'S FORMULA /9/ WERE USED.                 
                                                                  
                 ISOTOPE        CF-249         CF-250             
                A(1/MEV)         29.4          31.2               
        SPIN-CUTOFF FACT         31.33         32.36              
          PAIRING E(MEV)          0.77          1.673             
              TEMP.(MEV)          0.3693        0.4025            
                C(1/MEV)          4.644         2.111             
                 EX(MEV)          3.562         5.423             
                                                                  
        THE LEVEL SCHEME TAKEN FROM REF. /10/.                    
                   NO.        ENERGY(KEV)   SPIN-PARITY           
                  G.S.             0           9/2 -              
                    1.            62.49       11/2 -              
                    2.           136.2        13/2 -              
                    3.           144.96        5/2 +              
                    4.           187.94        7/2 +              
                    5.           220.0        15/2 -              
                    6.           243.07        9/2 +              
                    7.           315.0        17/2 -              
                    8.           315.1        11/2 +              
                    9.           379.52        7/2 +              
                   10.           384.0        13/2 +              
                   11.           416.8         1/2 +              
                   12.           425.0        19/2 -              
                   13.           437.56        9/2 +              
                   14.           440.0         3/2 +              
                   15.           442.98        7/2 +              
                   16.           460.0         5/2 +              
                   17.           500.7         9/2 +              
                   18.           550.0         1/2 +              
                   19.           606.0         5/2 +              
                   20.           668.0        13/2 -              
                   21.           751.0        15/2 -              
                   22.           813.20        5/2 -              
                   23.           852.19        7/2 -              
                   24.           902.5         9/2 -              
                   25.           920.0        11/2 +              
                   26.           962.0        11/2 -              
                   27.           992.0        13/2 +              
                   28.          1008.0         9/2 +              
                CONTINUUM LEVELS ASSUMED ABOVE  1031. KEV.        
                                                                  
  MT= 2         ELASTIC SCATTERING                                
      CALCULATED AS TOTAL - PARTIAL CROSS SECTIONS.               
                                                                  
  MT= 4         TOTAL INELASTIC SCATTERING                        
      SUM OF MT=51 to 78 AND 91.                                  
                                                                  
  MT=16,17      (N,2N), (N,3N) CROSS SECTIONS                     
        STAPRE RESULTS CALCULATED BY KONSHIN /11/ were adopted.   
                                                                  
  MT=18         FISSION CROSS SECTION                             
        DATA WERE TAKEN FROM JENDL-3.2 WHICH WAS EVALUATED ON THE 
        BASIS OF THE MEASURED DATA BY DABBS+ /5/, SILBERT/12/     
        AND KUPRIYANOV+ /13/.                                     
                                                                  
  MT=51, 52, 55                                                   
        CALCULATED WITH ECIS /14/ AND CASTHY /7/ CODES.           
        LAGRANGE'S DEFORMED OPTICAL POTENTIAL PARAMETERS /15/     
        WERE USED.                                                
           V  = 49.82 - 17*((N-Z)/A) - 0.3*EN  (MEV)              
           WS =  5.52 - 9*((N-Z)/A)+ 0.4*EN  (MEV)   EN=< 10 MEV  
              =  9.52 - 9*((N-Z)/A)  (MEV)      10 =