63-Eu-154

 63-EU-154 JNDC       EVAL-DEC90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-DEC90 REV2-NOV93                       
----JENDL-3.2         MATERIAL 6334                               
-----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/.                       
90-12 STATISTICAL MODEL CALUCULATION WAS MADE BY RENORMALIZING    
      THE CAPTURE CROSS SECTION.                                  
93-11 JENDL-3.2 WAS MADE BY JNDC FPND W.G.                        
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (2,151)         RESOLVED RESONANCE PARAMETERS.  NEGATIVE    
                      RESONANCE PARAMETERS WERE MODIFIED.         
     ***********************************************************  
                                                                  
                                                                  
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 0.0262 KEV     
    RESONANCE PARAMETERS IN JENDL-2 WERE REPLACED WITH THE RECOM- 
    MENDATION BY MUGHABGHAB/3/.  TOTAL SPIN J WAS TENTATIVELY     
    ESTIMATED WITH A RANDOM NUMBER METHOD.  PARAMETERS OF THE     
    NEGATIVE LEVEL WERE ADJUSTED TO THE THERMAL CAPTURE CROSS     
    SECTION AND RESONANCE INTEGRAL MEASURED BY SEKINE ET AL./4/   
                                                                  
  UNRESOLVED RESONANCE REGION : 0.0262 KEV - 100 KEV              
    THE NEUTRON STRENGTH FUNCTIONS, S0, S1 AND S2 WERE CALCULATED 
    WITH OPTICAL MODEL CODE CASTHY/5/.                            
    THE OBSERVED LEVEL SPACING WAS DETERMINED TO REPRODUCE THE    
    CAPTURE CROSS SECTION CALCULATED WITH CASTHY.  THE            
    EFFECTIVE SCATTERING RADIUS WAS OBTAINED FROM FITTING TO THE  
    CALCULATED TOTAL CROSS SECTION AT 100 KEV.                    
    THE RADIATION WIDTH WAS BASED ON THE COMPILATION OF           
    MUGHABGHAB /3/.                                               
                                                                  
  TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:                     
    S0 = 2.200E-4, S1 = 0.940E-4, S2 = 2.300E-4, SG = 2740.E-4,   
    GG = 0.126 EV, R  = 7.006 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL        1848.2                      -                  
      ELASTIC         6.581                    -                  
      CAPTURE      1841.6                    1180                 
                                                                  
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/6/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP     
  EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE 
  DETERMINED SO AS TO REPRODUCE THE EU-NATURAL TOTAL CROSS SECTION
  MEASURED BY FOSTER AND GLASGOW/7/.  THE OMP'S FOR CHARGED       
  PARTICLES ARE AS FOLLOWS:                                       
     PROTON   = PEREY/8/                                          
     ALPHA    = HUIZENGA AND IGO/9/                               
     DEUTERON = LOHR AND HAEBERLI/10/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/11/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/12/ WERE EVALUATED BY IIJIMA ET AL./13/  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
  /14/.                                                           
                                                                  
  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./15/.           
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GR.       0.0             3  -                         
            1        0.0682          4  +                         
            2        0.0957          4  +                         
            3        0.0971          5  +                         
            4        0.1000          5  -                         
            5        0.1008          4  +                         
            6        0.1367          5  +                         
            7        0.1800          8  -                         
      LEVELS ABOVE 0.2 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/16/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (2840.0E-4) WAS ADJUSTED TO   
    REPRODUCE THE CAPTURE CROSS SECTION OF 2610 MILLI-BARNS AT 50 
    KEV WHICH WAS 20 % LARGER THAN JENDL-2 CALCULATION/17/.       
                                                                  
  NOTE : RESULTS OF PREVIOUS INTEGRAL TEST OF JENDL-2/1,17/ WERE  
         REFLECTED IN THE PRESENT EVALUATION.                     
                                                                  
  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 =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 (= 183.4) WAS ESTIMATED BY THE       
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/18/ 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)          4.32  MB (SYSTEMATICS OF FORREST/19/)        
      (N,ALPHA)      1.68  MB (SYSTEMATICS OF 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  = 44.77-0.0164E        R0 = 6.818    A0 = 0.475        
        WS = 6.878-0.1408E        RS = 7.719    AS = 0.45         
        VSO= 7.0                  RSO= 6.818    ASO= 0.48         
  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    
 ---------------------------------------------------------------  
 61-PM-150     2.270E+01 3.800E-01 7.943E+00 1.973E+00 0.0        
 61-PM-151     2.882E+01 4.260E-01 8.842E+00 4.956E+00 1.110E+00  
 61-PM-152  *  2.440E+01 5.242E-01 1.481E+02 5.009E+00 0.0        
 61-PM-153     2.285E+01 4.950E-01 7.324E+00 4.895E+00 9.200E-01  
                                                                  
 62-SM-151     2.687E+01 5.000E-01 2.313E+01 6.327E+00 1.220E+00  
 62-SM-152     2.375E+01 5.470E-01 2.365E+00 7.669E+00 2.330E+00  
 62-SM-153     2.572E+01 5.160E-01 2.101E+01 6.405E+00 1.220E+00  
 62-SM-154     2.190E+01 5.600E-01 1.960E+00 7.188E+00 2.140E+00  
                                                                  
 63-EU-152     2.484E+01 4.850E-01 8.700E+01 4.264E+00 0.0        
 63-EU-153     2.195E+01 5.750E-01 1.698E+01 6.504E+00 1.110E+00  
 63-EU-154     2.267E+01 4.320E-01 1.644E+01 2.784E+00 0.0        
 63-EU-155     2.083E+01 5.200E-01 5.190E+00 4.837E+00 9.200E-01  
 ---------------------------------------------------------------  
  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 15.98 FOR EU-154 AND 8.187 FOR EU-155.             
                                                                  
REFERENCES                                                        
 1) AOKI, T. ET AL.: PROC. INT. CONF. ON NUCLEAR DATA FOR BASIC   
    AND APPLIED SCIENCE, SANTA FE., VOL. 2, P.1627 (1985).        
 2) KAWAI, M. ET AL.: J. NUCL. SCI. TECHNOL., 29, 195 (1992).     
 3) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",   
    ACADEMIC PRESS (1984).                                        
 4) SEKINE, T. ET AL.: APPL. RADIAT. ISOT., 38, 513 (1987).       
 5) IGARASI, S. AND FUKAHORI, T.: JAERI 1321 (1991).              
 6) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
 7) FOSTER, D.G. JR. AND GLASGOW, D.W.: PHYS. REV., C3, 576       
    (1971).                                                       
 8) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
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10) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
11) BECCHETTI, F.D., JR. AND GREENLEES, G.W.: POLARIZATION        
    PHENOMENA IN NUCLEAR REACTIONS ((EDS) H.H. BARSHALL AND       
    W. HAEBERLI), P. 682, THE UNIVERSITY OF WISCONSIN PRESS.      
    (1971).                                                       
12) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
13) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
14) GRUPPELAAR, H.: ECN-13 (1977).                                
15) MATSUMOTO, J.: PRIVATE COMMUNICATION (1981).                  
16) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
17) WATANABE, T. ET AL.: JAERI-M 88-065, P. 148 (1988).           
18) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR        
    REACTIONS", NORTH HOLLAND (1968).                             
19) FORREST, R.A.: AERE-R 12419 (1986).