94-Pu-238

 94-PU-238 MAPI,JAERI EVAL-MAR89 T.KAWAKITA, T.NAKAGAWA           
                      DIST-SEP89 REV2-JUN94                       
----JENDL-3.2         MATERIAL 9434                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
HISTORY                                                           
79-03 NEW EVALUATION WAS MADE BY T.KAWAKITA (PNC).                
89-03 RE-EVALUATION WAS MADE BY T.KAWAKITA (MAPI) AND             
      T.NAKAGAWA(JAERI).                                          
94-06 JENDL-3.2.                                                  
       NU-P, NU-D AND NU-TOTAL WERE MODIFIED.                     
      COMPILED BY T.NAKAGAWA (NDC/JAERI)                          
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (1,452), (1,455), (1,456)                                   
     ***********************************************************  
                                                                  
                                                                  
MF=1 GENERAL INFORMATION                                          
  MT=451 COMMENT AND DICTIONARY                                   
  MT=452 NUMBER OF NEUTRONS PER FISSION                           
       SUM OF NU-P NAD NU-D.                                      
  MT=455 DELAYED NEUTRONS PER FISSION                             
       AVERAGE VALUES OF SYSTEMATICS BY TUTTLE/1/, BENEDETTI ET   
       AL./2/ AND WALDO ET AL./3/  DECAY CONSTANTS WERE EVALUATED 
       BY BRADY AND ENGLAND/4/.                                   
  MT=456 PROMPT NEUTRONS PER FISSION                              
       THE THERMAL VALUE OF PROMPT NEUTRONS WAS BASED ON EXPERI-  
       MENTAL DATA OF JAFFEY AND LERNER /5/, KROSHKIN ET AL./6/   
       AND HADDAD AND ASGHER/7/.  THE ENERGY DEPENDENT TERM WAS   
       ESTIMATED FROM HOWRTON'S FORMULA /8/.                      
                                                                  
MF=2  RESONANCE PARAMETERS                                        
  MT=151  RESOLVED RESONANCE PARAMETERS FOR MLBW FORMULA.         
      ENERGY RANGE IS FROM 1.0E-5 EV TO 500 EV. PARAMETERS WERE   
      TAKEN FROM THE FOLLOWING EXPERIMENTAL DATA.                 
         49 RESONANCES ABOVE 10 EV : SILBERT /9/                  
          4 RESONANCES BELOW 10 EV : YOUNG /10/                   
      THE PARAMETERS OF TWO NEGATIVE AND 2.9-EV RESONANCES WERE   
      ADJUSTED TO THE THERMAL CROSS SECTIONS/11/.                 
                                                                  
      CALCULATED 2200-M/S CROSS SECTIONS AND RESONANCE INTEGRALS  
                      2200-M/S          RES. INTEG.               
          TOTAL        586.7  B             -                     
          ELASTIC       28.53 B             -                     
          FISSION       17.89 B            32.7 B                 
          CAPTURE      540.3  B           154   B                 
                                                                  
MF=3  NEUTRON CROSS SECTIONS                                      
                                                                  
  THE ENERGY REGION BELOW 500 EV IS THE RESONANCE REGION.  ABOVE  
  500 EV, THE CROSS SECTIONS WERE EVALUATED AS FOLLOWS.           
                                                                  
  MT=1,2,4,51-78,91,102  TOTAL, ELASTIC AND INELASTIC SCATTERING, 
                         AND CAPTURE CROSS SECTIONS               
      CALCULATED WITH OPTICAL AND STATISTICAL MODELS.  CASTHY/12/ 
      WAS USED FOR THE CALCULATION.                               
                                                                  
      OPTICAL POTENTIAL PARAMETERS:                               
        THE REAL POTENTIAL WAS ADJUSTED SO AS TO OBTAINED THE     
        REASONABLE COMPOUND NUCLEUS FORMATION CROSS SECTION.  THE 
        OTHER PARAMETERS WERE TAKEN FROM MURATA'S EVALUATION /13/.
           V  = 38.8 - 0.05*EN          (MEV)                     
           WS = 6.5 + 0.15*EN           (MEV)                     
           VSO= 7.0                     (MEV)                     
           A  = B  = ASO= 0.47          (FM)                      
           R  = RSO= 1.32               (FM)                      
           RS = 1.52                    (FM)                      
                                                                  
      THE LEVEL SCHEME:                                           
        TAKEN FROM REF. /14/.                                     
              NO.      ENERGY(KEV)   SPIN-PARITY                  
              G.S.          0.0         0 +                       
               1           44.08        2 +                       
               2          145.98        4 +                       
               3          303.4         6 +                       
               4          514.0         8 +                       
               5          605.1         1 -                       
               6          661.4         3 -                       
               7          763.2         5 -                       
               8          941.5         0 +                       
               9          962.77        1 -                       
              10          968.2         2 -                       
              11          983.0         2 +                       
              12          985.5         2 -                       
              13         1028.55        2 +                       
              14         1069.95        3 +                       
              15         1082.57        4 -                       
              16         1125.8         4 +                       
              17         1174.5         2 +                       
              18         1202.7         3 -                       
              19         1228.6         0 +                       
              20         1264.2         2 +                       
              21         1310.3         2 +                       
              22         1426.6         0 +                       
              23         1447.3         1 -                       
              24         1458.5         2 +                       
              25         1560.0         1 -                       
              26         1596.5         2 +                       
              27         1621.4         1 -                       
              28         1636.6         1 -                       
           CONTINUUM LEVELS ASSUMED ABOVE 1.65 MEV.               
      THE LEVEL DENSITY PARAMETERS OF GILBERT AND CAMERON /15/.   
      THE FISSION, (N,2N) AND (N,3N) CROSS SECTIONS WERE TAKEN    
      INTO ACCOUNT AS THE COMPETING PROCESSES.  FOR THE CAPTURE   
      CROSS SECTION, THE GAMMA-RAY STRENGTH FUNCTION WAS ESTIMATED
      FROM D-OBS = 9.5EV AND AVERAGE RADIATIVE WIDTH = 0.04 EV.   
                                                                  
  MT=16,17  (N,2N) AND (N,3N) REACTION CROSS SECTIONS             
      CALCULATION BASED ON THE PEARLSTEIN'S METHOD /16/.          
  MT=18   FISSION CROSS SECTION                                   
      EVALUATED MAINLY ON THE BASIS OF DATA MEASURED BY           
      BUDTZ-JORGENSEN/17/.  OTHER EXPERIMENTS /9, 18, 19, 20, 21, 
      22, 23, 24, 25/ WERE ALSO TAKEN INTO CONSIDERATION.         
  MT=251  MU-BAR                                                  
      CALCULATED WITH OPTICAL MODEL.                              
                                                                  
MF=4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS                 
  MT=2,51-78,91                                                   
      CALCULATED WITH OPTICAL MODEL.                              
  MT=16,17,18                                                     
      ISOTROPIC IN THE LABORATORY SYSTEM.                         
                                                                  
MF=5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                  
  MT=16,17,91                                                     
      EVAPORATION SPECTRUM WAS ASSUMED.                           
  MT=18                                                           
      MAXWELLIAN TYPE FISSION SPECTRUM.  TEMPERATURE WAS ESTIMATED
      FROM Z**2/A SYSTEMATICS BY SMITH ET AL. /26/.               
                                                                  
REFERENCES                                                        
 1) R.J. TUTTLE: INDC(NDS)-107/G+SPECIAL, P.29 (1979),            
 2) G. BENEDETTI ET AL.: NUCL. SCI. ENG., 80, 379 (1982).         
 3) R. WALDO ET AL.: PHYS. REV., C23, 1113 (1981).                
 4) M.C. BRADY AND T.R. ENGLAND: NUCL. SCI. ENG., 103, 129 (1989).
 5) A.H. JAFFEY AND J.L. LERNER: NUCL. PHYS., A145, 1 (1970).     
 6) N.I. KROSHKIN ET AL.: ATOMNAJA ENERGIJA, 29, 95 (1970).       
        = EXFOR40064007.                                          
 7) M. HADDAD AND M. ASGHAR: 1988 MITO, P.979 (1988).             
 8) R.J. HOWERTON: NUCL. SCI. ENG., 62, 438 (1977).               
 9) M.G. SILBERT ET AL.: NUCL. SCI. ENG., 52, 176 (1973).         
10) T.E. YOUNG ET AL.: NUCL. SCI. ENG., 30, 355 (1967).           
11) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL. 1, PART B",    
    ACADEMIC PRESS (1984).                                        
12) S. IGARASI AND T. FUKAHORI: JAERI 1321 (1991).                
13) T. MURATA: PRIVATE COMMUNICATION.                             
14) C.M. LEDERER ET AL.: TABLE OF ISOTOPES, 7TH ED. (1978).       
15) A. GILBERT AND A.G.W. CAMERON: CAN. J. PHYS., 43, 1446 (1965).
16) S. PEARLSTEIN: NUCL. SCI. ENG., 23, 238 (1965).               
17) C. BUDTZ-JORGENSEN ET AL.: 1982 ANTWERP, 206 (1983).          
18) D.M. BARTON AND P.G. KOONTY: PHYS. REV., 162, 1070 (1967).    
19) E.F. FOMUSHKIN ET AL.: SOV. J. NUCL. PHYS., 5, 689 (1967).    
20) S.B. ERMAGAMBETOV AND G.N. SHIRENKIN: SOV. J. NUCL. PHYS.,    
    25, 1364 (1968).                                              
21) D.M. DRAKE ET AL.: LA-4420, P.101 (1970).                     
22) S.B. ERMAGAMBETOV ET AL.: SOV. J. NUCL. ENERGY,29, 1190(1970).
23) E.F. FOMUSHKIN ET AL.: SOV. J. NUCL. PHYS., 10, 529 (1970).   
24) D.L. SHPAK ET AL.: JETP LETTERS, 15, 228 (1972).              
25) B. ALAM ET AL.: NUCL. SCI. ENG., 99, 267 (1988).              
26) A.B. SMITH ET AL.: ANL/NDM-50 (1979).