98-Cf-251

 98-CF-251 JAERI      EVAL-MAR86 T.NAKAGAWA                       
 JAERI-M 86-086       DIST-MAR02 REV2-FEB02            20020222   
----JENDL-3.3         MATERIAL 9858                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
   ===========================================================    
   JENDL-3.2 data were automatically transformed to JENDL-3.3.    
    Interpolation of spectra: 22 (unit base interpolation)        
    (3,251) deleted, T-matrix of (4,2) deleted, and others.       
   ===========================================================    
                                                                  
HISTORY                                                           
86-03 NEW EVALUATION WAS MADE BY T.NAKAGAWA (JAERI).              
      DETAILS ARE DESCRIBED IN REF. /1/.                          
                                                                  
MF=1  GENERAL INFORMATION                                         
  MT=451   COMMENTS AND DICTIONARY                                
  MT=452   NUMBER OF NEUTRONS PER FISSION                         
             SUM OF MT=455 AND MT=456                             
  MT=455   DELAYED NEUTRON DATA                                   
             BASED ON SEMI-EMPIRICAL FORMULA BY TUTTLE /2/.       
  MT=456   NUMBER OF PROMPT NEUTRONS PER FISSION                  
             BASED ON SEMI-EMPIRICAL FORMULA BY HOWERTON /3/.     
                                                                  
MF=2,MT=151  RESONANCE PARAMETERS                                 
  RESOLVED RESONANCES FOR SLBW FORMULA : 1.0E-5 EV TO 150 EV      
    HYPOTHETICAL RESONANCE LEVELS WERE GENERATED, AND THEIR       
    PARAMETERS WERE DETERMINED FROM THE ASSUMED AVERAGE PARAMETERS
        D-0 = 6.3 EV, RADIATIVE CAPTURE WIDTH = 0.0435 EV,        
        S-0 = 1.0E-4, FISSION WITH = 0.0746 EV, R = 9.253 FM.     
    PARAMETERS OF THE NEGATIVE AND FIRST POSITIVE LEVELS WERE     
    ADJUSTED SO AS TO REPRODUCE THE THERMAL CROSS SECTIONS AND    
    RESONANCE INTEGRALS.                                          
  UNRESOLVED RESONANCES                : 150 EV TO 30 KEV         
    PARAMETERS WERE ADJUSTED SO AS TO REPRODUCE THE ASSUMED       
    FISSION AND RADIATIVE CAPTURE CROSS SECTIONS.                 
        S-0 = 0.843E-4, S-1 = 4.56E-4, R = 8.842 FM,              
        D-0 = 6.3 EV, RADIATIVE WIDTH = 0.0435 EV,                
        FISSION WIDTH = 0.281 EV (FOR L=0), = 0.551 EV (FOR L=1)  
                                                                  
  CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS      
                   2200-M/S VALUE           RES. INT.             
      TOTAL        7889.4    B                 -                  
      ELASTIC        76.04   B                 -                  
      FISSION      4935.4    B              2780.  B              
      CAPTURE      2877.9    B              1600.  B              
                                                                  
MF=3  NEUTRON CROSS SECTIONS                                      
  MT=1   TOTAL                                                    
  MT=2   ELASTIC SCATTERING                                       
  MT=4, 51 TO 73 AND 91 INELASTIC SCATTERING                      
  MT=102 RADIATIVE CAPTURE                                        
  MT=251 MU-BAR                                                   
    CALCULATED WITH THE PROGRAM CASTHY /4/ BASED ON THE OPTICAL   
    AND STATISTICAL MODELS.  OPTICAL POTENTIAL PARAMETERS WERE    
    OBTAINED /5/ BY FITTING THE TOTAL CROSS SECTION OF PHILLIPS   
    AND HOWE /6/ FOR AM-241:                                      
           V = 43.4 - 0.107*EN                      (MEV)         
           WS= 6.95 - 0.339*EN + 0.0531*EN**2       (MEV)         
           WV= 0             , VSO = 7.0            (MEV)         
           R = RSO = 1.282   , RS = 1.29            (FM)          
           A = ASO = 0.60    , B  = 0.5             (FM)          
    IN THE STATISTICAL CALCULATION, LEVEL FLUCTUATION AND         
    COMPETING PROCESS(FISSION, (N,2N), (N,3N) AND (N,4N)) WERE    
    TAKEN INTO ACCOUNT.  THE LEVEL SCHEME WAS TAKEN FROM REF. /7/.
          NO.  ENERGY(KEV) J-PARITY     NO.  ENERGY(KEV) J-PARITY 
         -------------------------     ------------------------   
         GROUND    0.0      1/2 +       12     295.7     13/2 +   
           1      24.825    3/2 +       13     319.29     9/2 +   
           2      47.828    5/2 +       14     325.35    13/2 +   
           3     105.73     7/2 +       15     370.39    11/2 -   
           4     106.304    7/2 +       16     392.0     11/2 +   
           5     146.46     9/2 +       17     424.10    15/2 +   
           6     166.31     9/2 +       18     434.3      9/2 -   
           7     177.69     3/2 +       19     442.      13/2 -   
           8     211.72     5/2 +       20     514.      11/2 -   
           9     237.76    11/2 +       21     544.05     5/2 +   
          10     239.34    11/2 +       22     590.18     7/2 +   
          11     258.44     7/2 +       23     649.2      9/2 +   
         -------------------------     ------------------------   
            LEVELS ABOVE 700 KEV WERE ASSUMED TO BE OVERLAPPING.  
    THE LEVEL DENSITY PARAMETERS WERE DERIVED FROM RESONANCE LEVEL
    SPACINGS AND LOW LAYING EXCITED LEVELS ON THE BASIS OF        
    GILBERT-CAMERON'S FOUMULA /8/.  THE AVERAGE RADIATIVE CAPTURE 
    WIDTH OF 0.0435 EV AND S-WAVE LEVEL SPACING OF 6.3 EV WERE    
    ASSUMED.                                                      
                                                                  
  MT=16,17 AND 37  (N,2N), (N,3N) AND (N,4N)                      
    CALCULATED WITH EVAPORATION MODEL.                            
                                                                  
  MT=18   FISSION                                                 
    EVALUATED ON THE BASIS OF THE SYSTEMATICS.                    
                                                                  
MF=4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS                 
  MT=2,51-73          CALCULATED WITH OPTICAL MODEL.              
  MT=16,17,18,37,91   ISOTROPIC DISTRIBUTIONS IN THE LABORATORY   
      SYSTEM WERE ASSUMED.                                        
                                                                  
MF=5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                  
  MT=16,17,37,91      EVAPORATION SPECTRUM.                       
  MT=18               MAXWELLIAN FISSION SPECTRUM.                
                      TEMPERATURE ESTIMATED FROM SYSTEMATICS OF   
                      SMITH ET AL./9/.                            
                                                                  
REFERENCES                                                        
 1) NAKAGAWA, T.: JAERI-M 86-086 (1986).                          
 2) TUTTLE, R.J.: INDC(NDS)-107/G+SPECIAL, P.29 (1979).           
 3) HOWERTON, R.J.: NUCL. SCI. ENG., 62, 438 (1977).              
 4) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).           
 5) IGARASI, S. AND NAKASAWA, T. : JAERI-M 8342 (1979).           
 6) PHILLIPS, T.W. AND HOWE, F.R.: NUCL. SCI. ENG., 69, 375(1979).
 7) SCHMORAK, M.R.: NUCL. DATA SHEETS, 32, 87 (1981).             
 8) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43,1446(1965).
 9) SMITH A.B. ET AL.: ANL/NDM-50 (1979).