64-Gd-156

 64-GD-156 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-MAR02 REV2-FEB02            20020222   
----JENDL-3.3         MATERIAL 6437                               
-----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                                                           
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/        
90-03 MODIFICATION FOR JENDL-3 WAS MADE/2/.                       
                                                                  
MF = 1  GENERAL INFORMATION                                       
  MT=451 COMMENTS AND DICTIONARY                                  
                                                                  
MF = 2  RESONANCE PARAMETERS                                      
  MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS             
  RESOLVED RESONANCE PARAMETERS FOR MLBW FORMULA (BELOW 2.214 KEV)
    RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2.  EVALUATION FOR 
    JENDL-2 WAS MADE ON THE BASIS OF THE DATA BY KARZHAVINA ET AL.
    /3/ AND BY COCEVA AND STEFANON/4/.  THE AVERAGE RADIATION     
    WIDTH OF 0.10611 EV WAS ASSUMED.  SCATTERING RADIUS OF 8.1 FM 
    WAS ADOPTED FROM BNL 325(3RD.)/5/.                            
                                                                  
  UNRESOLVED RESONANCE REGION : 2.214 KEV - 100 KEV               
    THE NEUTRON STRENGTH FUNCTIONS S0, S1, S2 WERE BASED ON THE   
    COMPILATION OF MUGHABGHAB/6/.  THE OBSERVED LEVEL SPACING WAS 
    DETERMINED TO REPRODUCE THE CAPTURE CROSS SECTION CALCULATED  
    WITH CASTHY/7/.  THE EFFECTIVE SCATTERING RADIUS WAS OBTAINED 
    FROM FITTING TO THE CALCULATED TOTAL CROSS SECTION AT 100 KEV.
    THE RADIATION WIDTH GG WAS BASED ON THE COMPILATION OF        
    MUGHABGHAB.                                                   
                                                                  
  TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:                     
    S0 = 1.700E-4, S1 = 0.550E-4, S2 = 2.600E-4, SG = 36.7E-4,    
    GG = 0.088 EV, R  = 7.363 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL           6.991                    -                  
      ELASTIC         4.804                    -                  
      CAPTURE         2.188                   121                 
                                                                  
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/8/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP     
  EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE 
  ADOPTED FROM IIJIMA AND KAWAI/9/, AND WS WAS CHANGED.  THE OMP'S
  FOR CHARGED PARTICLES ARE AS FOLLOWS:                           
     PROTON   = PEREY/10/                                         
     ALPHA    = HUIZENGA AND IGO/11/                              
     DEUTERON = LOHR AND HAEBERLI/12/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/13/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/14/ WERE EVALUATED BY IIJIMA ET AL./15/  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
  /16/.                                                           
                                                                  
  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./17/.           
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GR.       0.0             0  +                         
            1        0.0890          2  +                         
            2        0.2882          4  +                         
            3        0.5847          6  +                         
            4        0.9651          8  +                         
            5        1.0494          0  +                         
            6        1.1294          2  +                         
            7        1.1541          2  +                         
            8        1.1681          0  +                         
            9        1.2424          1  -                         
           10        1.2480          3  +                         
           11        1.2580          2  +                         
           12        1.2761          3  -                         
           13        1.2981          4  +                         
           14        1.3196          2  -                         
           15        1.3554          4  +                         
           16        1.3664          1  -                         
           17        1.4082          5  -                         
           18        1.4147         10  +                         
           19        1.4623          4  +                         
           20        1.5069          5  +                         
           21        1.5105          4  +                         
           22        1.5388          3  +                         
           23        1.6225          5  +                         
           24        1.7152          0  +                         
           25        1.7710          1  +                         
           26        1.8279          2  +                         
           27        1.8517          3  -                         
      LEVELS ABOVE 1.916 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/18/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (2.32E-03) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION OF 480 MILLI-BARNS AT 50  
    KEV MEASURED BY SHORIN ET AL./19/ AND KONONOV 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 =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 (= 145.7) WAS ESTIMATED BY THE       
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/21/ 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)      1700.00  MB (SYSTEMATICS OF WEN DEN LU+/22/)    
      (N,P)          6.99  MB (SYSTEMATICS OF FORREST/23/)        
      (N,ALPHA)      3.10  MB (RECOMMENDED BY FORREST/23/)        
                                                                  
  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  = 38.0                 R0 = 7.439    A0 = 0.47         
        WS = 8.0                  RS = 7.439    AS = 0.52         
        VSO= 7.0                  RSO= 7.439    ASO= 0.47         
  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    
 ---------------------------------------------------------------  
 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  
 62-SM-155     2.402E+01 5.080E-01 8.478E+00 5.767E+00 1.220E+00  
                                                                  
 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  
 63-EU-156     2.084E+01 4.030E-01 6.286E+00 1.992E+00 0.0        
                                                                  
 64-GD-154     2.349E+01 5.270E-01 2.018E+00 6.893E+00 2.080E+00  
 64-GD-155     2.500E+01 5.100E-01 2.181E+01 5.822E+00 9.700E-01  
 64-GD-156     2.254E+01 5.200E-01 1.630E+00 6.286E+00 1.890E+00  
 64-GD-157     2.278E+01 5.210E-01 1.077E+01 5.454E+00 9.700E-01  
 ---------------------------------------------------------------  
                                                                  
 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 9.458 FOR GD-156 AND 8.107 FOR GD-157.             
                                                                  
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.: PROC. INT. CONF. ON NUCLEAR DATA FOR SCIENCE
    AND TECHNOLOGY, MITO, P. 569 (1988).                          
 3) KARZHAVINA, E.N., ET AL.: YAD. FIZ., 9, 897 (1969).           
 4) COCEVA, C., STEFANON, M.: NUCL. PHYS., A315, 1 (1979).        
 5) MUGHABGHAB, S.F. AND GARBER, D.I.: "NEUTRON CROSS SECTIONS,   
    VOL. 1, RESONANCE PARAMETERS", BNL 325, 3RD ED., VOL. 1,      
    (1973).                                                       
 6) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",   
    ACADEMIC PRESS (1984).                                        
 7) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).           
 8) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
 9) IIJIMA, S. AND KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77      
    (1983).                                                       
10) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
11) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).       
12) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
13) 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).                                                       
14) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
15) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
16) GRUPPELAAR, H.: ECN-13 (1977).                                
17) MATSUMOTO, J.: PRIVATE COMMUNICATION (1981).                  
18) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
19) SHORIN, V.S., ET AL.: SOV. J. NUCL. PHYS., 19, 2 (1974).      
20) KONONOV, V.N., ET AL.: SOV. J. NUCL. PHYS., 27, 5 (1978).     
21) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR        
    REACTIONS", NORTH HOLLAND (1968).                             
22) WEN DEN LU AND FINK, R.W.: PHYS. REV., C4, 1173 (1971).       
23) FORREST, R.A.: AERE-R 12419 (1986).