53-I -127

 53-I -127 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-SEP90 REV2-APR93                       
----JENDL-3.2         MATERIAL 5325                               
-----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/.                       
93-09 JENDL-3.2 WAS MADE BY JNDC FPND W.G.                        
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (2,151)       UPPER BOUNDARY OF RESOLVED RESONANCE REGION   
                    WAS CHANGED FROM 4.252 KEV TO 2 KEV.          
     ***********************************************************  
                                                                  
                                                                  
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 2.0 KEV        
    RESONANCE PARAMETERS OF JENDL-2 WERE MODIFIED AS FOLLOWS:     
    EVALUATION FOR JENDL-2 WAS CARRIED OUT ON THE BASIS OF THE    
    MEASUREMENTS BY GARG ET AL./3/, CAUVIN ET AL./4/, ROHR ET     
    AL./5/, AND MACKLIN/6/.  RESONANCE ENERGIES WERE BASED ON THE 
    DATA BY GARG ET AL. (64 LEVELS), BY ROHR ET AL. (190 LEVELS), 
    AND BY MACKLIN (119 LEVELS).  NEUTRON WIDTHS WERE DERIVED FROM
    THE DATA OF 2G*(REDUCED NEUTRON WIDTH) BY GARG ET AL., THOSE  
    OF 2G*(NEUTRON WIDTH) BY ROHR ET AL., AND THOSE OF G*(NEUTRON 
    WIDTH) AND NEUTRON CAPTURE AREAS BY MACKLIN.  RADIATION WIDTHS
    WERE DERIVED FROM THE DATA OF 2G*(RADIATION WIDTH) BY ROHR ET 
    AL. AND FROM THOSE OF (72/37)*G*(RADIATION WIDTH) BY MACKLIN. 
    AVERAGE RADIATION WIDTH OF 83.24 MEV OBTAINED BY AVERAGING THE
    DATA BY ROHR ET AL., AND THAT OF 110 MEV GIVEN BY MACKLIN WERE
    ADOPTED IN THE ENERGY REGIONS BELOW AND ABOVE 2650 EV,        
    RESPECTIVELY.  THE DATA OF TOTAL SPIN J MEASURED BY CAUVIN ET 
    AL. WERE AVAILABLE FOR THE 13 RESONANCE LEVELS BELOW 240 EV.  
    AS FOR THE REMAINING 360 LEVELS, TARGET SPIN OF 2.5 WAS       
    ADOPTED AS TOTAL SPIN.  TWO NEGATIVE RESONANCES WERE ADDED SO 
    AS TO REPRODUCE THE THERMAL CAPTURE AND SCATTERING CROSS      
    SECTIONS OF 6.2+-0.2 AND 3.54+-0.03 BARNS/7/, RESPECTIVELY.   
    SCATTERING RADIUS WAS ALSO TAKEN FROM MUGHABGHAB ET AL./7/    
                                                                  
    FOR JENDL-3, THE VALUES OF TOTAL SPIN J FOR THE 360 RESONANCE 
    LEVELS MENTIONED ABOVE WERE TENTATIVELY ESTIMATED WITH A      
    RANDOM NUMBER METHOD.  NEUTRON AND RADIATION WIDTHS WERE      
    MODIFIED ON THE BASIS OF THE ESTIMATED J-VALUES.  A RESONANCE 
    LEVEL MEASURED BY POPOV AND TSHETSYAK/8/ WAS ADDED AT 137.0   
    EV, AND AVERAGE RADIATION WIDTHS OF THE 20.41-, 65.93- AND    
    174.22-EV LEVELS WERE REPLACED BY THE NEW DATA MEASURED BY    
    THEM.  RESONANCE PARAMETERS OF THE TWO NEGATIVE LEVELS WERE   
    ALSO MODIFIED SO AS TO REPRODUCE THE ABOVE-MENTIONED THERMAL  
    CAPTURE AND SCATTERING CROSS SECTIONS ACCORDING TO THE        
    MODIFICATION OF THE POSITIVE LEVELS.                          
                                                                  
  UNRESOLVED RESONANCE REGION : 2 KEV - 100 KEV                   
    UNRESOLVED RESONANCE PARAMETERS WERE ADOPTED FROM JENDL-2.    
    THE PARAMETERS WERE DETERMINED TO REPRODUCE THE CAPTURE CROSS 
    SECTION CALCULATED WITH CASTHY /9/.  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 = 0.760E-4, S1 = 1.580E-4, S2 = 0.990E-4, SG = 88.5E-4,    
    GG = 0.1175EV, R  = 5.605 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL           9.740                    -                  
      ELASTIC         3.540                    -                  
      CAPTURE         6.200                   148                 
                                                                  
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/10/ 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 AND RSO OF IIJIMA-KAWAI POTENTIAL/11/.   
  THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:                 
     PROTON   = PEREY/12/                                         
     ALPHA    = HUIZENGA AND IGO/13/                              
     DEUTERON = LOHR AND HAEBERLI/14/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/15/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/16/ WERE EVALUATED BY IIJIMA ET AL./17/  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
  /18/.                                                           
                                                                  
  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./19/            
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GR.       0.0            5/2 +                         
            1        0.0576         7/2 +                         
            2        0.2028         3/2 +                         
            3        0.3750         1/2 +                         
            4        0.4179         5/2 +                         
            5        0.6184         3/2 +                         
            6        0.6286         7/2 +                         
            7        0.6510         9/2 +                         
            8        0.7165        11/2 +                         
            9        0.7446         9/2 +                         
           10        0.9910         3/2 +                         
      LEVELS ABOVE 1.1 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/20/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (8.29E-03) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION OF 760 MILLI-BARNS AT 25  
    KEV MEASURED BY YAMAMURO ET AL./21/                           
                                                                  
  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 = 33  (N,N'T) 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 (= 185.0) WAS ESTIMATED BY THE       
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/22/ AND LEVEL  
    DENSITY PARAMETERS.                                           
                                                                  
    FINALLY, THE (N,2N), (N,P) AND (N,ALPHA) CROSS SECTIONS WERE  
    NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:               
      (N,2N)      1800.00  MB (RECOMMENDED BY BYCHKOV+/23/)       
      (N,P)         16.00  MB (RECOMMENDED BY FORREST/24/)        
      (N,ALPHA)      1.50  MB (RECOMMENDED BY FORREST)            
                                                                  
  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  = 45.97-0.199E         R0 = 6.481    A0 = 0.62         
        WS = 6.502                RS = 6.926    AS = 0.35         
        VSO= 7.0                  RSO= 6.49     ASO= 0.62         
  THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.   
                                                                  
TABLE 2  LEVEL DENSITY PARAMETERS                                 
                                                                  
 NUCLIDE  SYST A(1/MEV)  T(MEV)    C(1/MEV)  EX(MEV)   PAIRING    
 ---------------------------------------------------------------  
 51-SB-123     1.585E+01 6.213E-01 1.285E+00 5.469E+00 1.430E+00  
 51-SB-124     1.696E+01 5.600E-01 1.090E+01 3.433E+00 0.0        
 51-SB-125     1.700E+01 5.120E-01 7.883E-01 3.792E+00 1.090E+00  
 51-SB-126     1.700E+01 5.250E-01 7.566E+00 2.897E+00 0.0        
                                                                  
 52-TE-124     1.784E+01 6.740E-01 1.452E+00 8.479E+00 2.570E+00  
 52-TE-125     1.992E+01 5.590E-01 5.035E+00 5.527E+00 1.140E+00  
 52-TE-126     1.706E+01 6.100E-01 5.154E-01 6.554E+00 2.230E+00  
 52-TE-127     2.004E+01 5.380E-01 3.633E+00 5.165E+00 1.140E+00  
                                                                  
 53-I -125  *  1.789E+01 5.895E-01 2.042E+00 5.696E+00 1.430E+00  
 53-I -126  *  1.763E+01 5.871E-01 1.981E+01 4.127E+00 0.0        
 53-I -127     1.717E+01 6.263E-01 4.458E+00 5.757E+00 1.090E+00  
 53-I -128     1.715E+01 6.200E-01 2.329E+01 4.542E+00 0.0        
 ---------------------------------------------------------------  
  SYST:  * = LDP'S WERE DETERMINED FROM SYSTEMATICS.              
                                                                  
 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 7.0 FOR I -127 AND 5.0 FOR I -128.                 
                                                                  
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    AND APPLIED SCIENCE, SANTA FE., VOL. 2, P.1627 (1985).        
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    AND TECHNOL., KNOXVILLE 1971", VOL.2, 785.                    
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 6) MACKLIN, R.L.: NUCL. SCI. ENG. 85, 350 (1983).                
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    (1971).                                                       
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    (1965).                                                       
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18) GRUPPELAAR, H.: ECN-13 (1977).                                
19) MATSUMOTO, J., ET AL.: JAERI-M 7734 (1978).                   
20) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
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22) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR        
    REACTIONS", NORTH HOLLAND (1968).                             
23) BYCHKOV, V.M. ET AL.: INDC(CCP)-146/LJ (1980).                
24) FORREST, R.A.: AERE-R 12419 (1986).