60-Nd-143

 60-ND-143 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-SEP90 REV2-NOV93                       
----JENDL-3.2         MATERIAL 6028                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
HISTORY                                                           
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/        
90-03 MODIFICATION FOR JENDL-3 WAS MADE/2/.                       
93-11 JENDL-3.2 WAS MADE BY JNDC FPND W.G.                        
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (2,151)       RESOLVED RESONANCE PARAMETERS                 
     ***********************************************************  
                                                                  
                                                                  
MF = 1  GENERAL INFORMATION                                       
  MT=451 COMMENTS AND DICTIONARY                                  
                                                                  
MF = 2  RESONANCE PARAMETERS                                      
  MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS             
  RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 5 KEV          
       FOR JENDL-2, RESONANCE ENERGIES WERE ADOPTED FROM          
    TELLIER/3/, AND THOSE NOT MEASURED BY TELLIER WERE TAKEN FROM 
    ROHR ET AL./4/ AND MUSGROVE ET AL./5/ AFTER NORMALIZATION TO  
    TELLIER'S DATA.  RADIATION WIDTHS WERE DERIVED FROM CAPTURE   
    AREAS MEASURED BY ROHR ET AL. BELOW 2 KEV AND MUSGROVE ET AL. 
    ABOVE 2.5 KEV,  FOR THE RESONANCES NOT MEASURED BY TELLIER,   
    NEUTRON WIDTHS WERE DETERMINED FROM CAPTURE AREAS BY ASSUMING 
    THE AVERAGE RADIATION WIDTHS OF 0.077 EV FOR S-WAVE RESONANCES
    AND 0.085 EV FOR P-WAVE ONES.  SCATTERING RADIUS WAS          
    DETERMINED FROM SYSTEMATICS OF MEASURED VALUES.  A NEGATIVE   
    RESONANCE WAS ADDED AT -6 EV SO AS TO REPRODUCE THE CAPTURE   
    CROSS SECTION OF 325+-10 BARNS COMPILED BY MUGHABGHAB ET      
    AL./6/                                                        
       FOR JENDL-3, TOTAL SPIN J OF SOME RESONANCES WAS ESTIMATED 
    WITH A RANDOM NUMBER METHOD.                                  
       FOR JENDL-3.2, THESE RESONANCE PARAMETERS WERE MODIFIED SO 
    AS TO REPRODUCE THE CAPTURE AREA DATA MEASURED AT ORNL, BY    
    TAKING ACCOUNT OF THE CORRECTION FACTOR (0.9507) ANNOUNCED BY 
    ALLEN ET AL./7/.  THE PARAMETERS OF A NEGATIVE RESONANCE AND  
    SCATTERING RADIUS WERE ADJUSETED TO GET BETTER AGREEMENT WITH 
    RECOMMENDED THERMAL CROSS SECTIONS/6/.                        
                                                                  
  UNRESOLVED RESONANCE REGION : 5 KEV - 100 KEV                   
    UNRESOLVED RESONANCE PARAMETARS WERE ADOPTED FROM JENDL-2.    
    THE NEUTRON STRENGTH FUNCTIONS, S0, S1 AND S2 WERE CALCULATED 
    WITH OPTICAL MODEL CODE CASTHY/8/.  THE OBSERVED LEVEL SPACING
    WAS DETERMINED TO REPRODUCE THE CAPTURE CROSS SECTION         
    CALCULATED WITH CASTHY AT 10 KEV.  THE EFFECTIVE SCATTERING   
    RADIUS WAS OBTAINED FROM FITTING TO THE CALCULATED TOTAL CROSS
    SECTION AT 100 KEV.                                           
                                                                  
  TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:                     
    S0 = 2.624E-4, S1 = 1.042E-4, S2 = 1.783E-4, SG = 21.4E-4,    
    GG = 0.079 EV, R  = 4.143 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL         408.2                      -                  
      ELASTIC        78.29                     -                  
      CAPTURE       329.9                     130                 
     (N,ALPHA)        0.0174                                      
                                                                  
MF = 3  NEUTRON CROSS SECTIONS                                    
  BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.                 
  ABOVE 100 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL      
  CALCULATION WAS PERFORMED WITH CASTHY, BY TAKING ACCOUNT OF     
  COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED    
  WITH PEGASUS/9/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP     
  EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE 
  DETERMINED TO REPRODUCE A SYSTEMATIC TREND OF THE TOTAL CROSS   
  SECTION BY CHANGING R0 OF IIJIMA-KAWAI POTENTIAL/10/.  THE OMP'S
  FOR CHARGED PARTICLES ARE AS FOLLOWS:                           
     PROTON   = PEREY/11/                                         
     ALPHA    = HUIZENGA AND IGO/12/                              
     DEUTERON = LOHR AND HAEBERLI/13/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/14/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/15/ WERE EVALUATED BY IIJIMA ET AL./16/  MORE       
  EXTENSIVE DETERMINATION AND MODIFICATION WERE MADE IN THE       
  PRESENT WORK.  TABLE 2 SHOWS THE LEVEL DENSITY PARAMETERS USED  
  IN THE PRESENT CALCULATION.  ENERGY DEPENDENCE OF SPIN CUT-OFF  
  PARAMETER IN THE ENERGY RANGE BELOW E-JOINT IS DUE TO GRUPPELAAR
  /17/.                                                           
                                                                  
  MT = 1  TOTAL                                                   
    SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED.              
                                                                  
  MT = 2  ELASTIC SCATTERING                                      
    CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).        
                                                                  
  MT = 4, 51 - 91  INELASTIC SCATTERING                           
    SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WAS       
    ADOPTED.  THE LEVEL SCHEME WAS TAKEN FROM REF./18/.           
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GR.       0.0            7/2 -                         
            1        0.7418         3/2 -                         
            2        1.2296        13/2 +                         
            3        1.3060         1/2 -                         
            4        1.4079         9/2 -                         
            5        1.4320        11/2 +                         
            6        1.5100         1/2 +                         
            7        1.5400         3/2 +                         
            8        1.5600         5/2 -                         
            9        1.6100         1/2 +                         
           10        1.7500         9/2 -                         
           11        1.7670         3/2 +                         
      LEVELS ABOVE 1.8 MEV WERE ASSUMED TO BE OVERLAPPING.        
                                                                  
  MT = 102  CAPTURE                                               
    SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH      
    CASTHY WAS ADOPTED.  DIRECT AND SEMI-DIRECT CAPTURE CROSS     
    SECTIONS WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI   
    AND REFFO/19/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (2.15E-03) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION OF 280 MILLI-BARNS AT 30  
    KEV MEASURED BY NAKAJIMA ET AL./20/                           
                                                                  
  MT = 16  (N,2N) CROSS SECTION                                   
  MT = 17  (N,3N) CROSS SECTION                                   
  MT = 22  (N,N'A) CROSS SECTION                                  
  MT = 28  (N,N'P) CROSS SECTION                                  
  MT = 32  (N,N'D) CROSS SECTION                                  
  MT =103  (N,P) CROSS SECTION                                    
  MT =104  (N,D) CROSS SECTION                                    
  MT =105  (N,T) CROSS SECTION                                    
  MT =106  (N,HE3) CROSS SECTION                                  
  MT =107  (N,ALPHA) CROSS SECTION                                
    THESE REACTION CROSS SECTIONS WERE CALCULATED WITH THE        
    PREEQUILIBRIUM AND MULTI-STEP EVAPORATION MODEL CODE PEGASUS. 
                                                                  
    THE KALBACH'S CONSTANT K (= 239.3) WAS ESTIMATED BY THE       
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/21/ AND LEVEL  
    DENSITY PARAMETERS.                                           
                                                                  
    FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE          
    NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:               
      (N,P)         11.00  MB (RECOMMENDED BY FORREST/22/)        
      (N,ALPHA)      4.02  MB (SYSTEMATICS OF FORREST/22/)        
                                                                  
    THE (N,ALPHA) CROSS SECTION BELOW 5 KEV WAS CALCULATED FROM   
    RESONANCE PARAMETERS, BY ASSUMING A MEAN ALPHA WIDTH OF       
    3.48E-6 EV SO AS TO REPRODUCE THE THERMAL CROSS SECTION/6/.   
    THE CROSS SECTION WAS AVERAGED IN SUITABLE ENERGY INTERVALS.  
    ABOVE 5 KEV, THE CROSS SECTION WAS CONNECTED SMOOTHLY TO THE  
    PEGASUS CALCULATION.                                          
                                                                  
  MT = 251  MU-BAR                                                
    CALCULATED WITH CASTHY.                                       
                                                                  
MF = 4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS               
  LEGENDRE POLYNOMIAL COEFFICIENTS FOR ANGULAR DISTRIBUTIONS ARE  
  GIVEN IN THE CENTER-OF-MASS SYSTEM FOR MT=2 AND DISCRETE INELAS-
  TIC LEVELS, AND IN THE LABORATORY SYSTEM FOR MT=91.  THEY WERE  
  CALCULATED WITH CASTHY.  FOR OTHER REACTIONS, ISOTROPIC DISTRI- 
  BUTIONS IN THE LABORATORY SYSTEM WERE ASSUMED.                  
                                                                  
MF = 5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                
  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE CALCULATED WITH 
  PEGASUS FOR INELASTIC SCATTERING TO OVERLAPPING LEVELS AND FOR  
  OTHER NEUTRON EMITTING REACTIONS.                               
                                                                  
TABLE 1  NEUTRON OPTICAL POTENTIAL PARAMETERS                     
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 45.76                R0 = 6.746    A0 = 0.6          
        WS = 6.97                 RS = 6.432    AS = 0.45         
        VSO= 7.0                  RSO= 6.694    ASO= 0.6          
  THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.   
                                                                  
TABLE 2  LEVEL DENSITY PARAMETERS                                 
                                                                  
 NUCLIDE       A(1/MEV)  T(MEV)    C(1/MEV)  EX(MEV)   PAIRING    
 ---------------------------------------------------------------  
 58-CE-139     1.374E+01 6.450E-01 9.282E-01 4.685E+00 1.170E+00  
 58-CE-140     1.413E+01 6.541E-01 3.376E-01 5.852E+00 2.020E+00  
 58-CE-141     1.714E+01 5.150E-01 7.134E-01 3.957E+00 1.170E+00  
 58-CE-142     1.600E+01 6.000E-01 4.210E-01 5.674E+00 1.930E+00  
                                                                  
 59-PR-140     1.448E+01 6.430E-01 7.927E+00 3.814E+00 0.0        
 59-PR-141     1.400E+01 6.500E-01 1.810E+00 4.559E+00 8.500E-01  
 59-PR-142     1.595E+01 6.150E-01 1.201E+01 3.974E+00 0.0        
 59-PR-143     1.500E+01 6.280E-01 2.607E+00 4.558E+00 7.600E-01  
                                                                  
 60-ND-141     1.477E+01 6.091E-01 9.537E-01 4.587E+00 1.180E+00  
 60-ND-142     1.288E+01 6.710E-01 2.250E-01 5.526E+00 2.030E+00  
 60-ND-143     1.826E+01 4.710E-01 5.220E-01 3.613E+00 1.180E+00  
 60-ND-144     1.771E+01 5.640E-01 4.792E-01 5.691E+00 1.940E+00  
 ---------------------------------------------------------------  
                                                                  
 SPIN CUTOFF PARAMETERS WERE CALCULATED AS 0.146*SQRT(A)*A**(2/3).
 IN THE CASTHY CALCULATION, SPIN CUTOFF FACTORS AT 0 MEV WERE     
 ASSUMED TO BE 7.227 FOR ND-143 AND 8.725 FOR ND-144.             
                                                                  
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17) GRUPPELAAR, H.: ECN-13 (1977).                                
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    INTERSCIENCE PUBLICATION (1978).                              
19) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
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    NUCL. DATA FOR REACTORS, HARWELL 1978, 438.                   
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    REACTIONS", NORTH HOLLAND (1968).                             
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