62-Sm-154

 62-SM-154 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-SEP90 REV2-JUN94                       
----JENDL-3.2         MATERIAL 6255                               
-----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/.                       
94-06 JENDL-3.2 WAS MADE BY JNDC FPND W.G.                        
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (3,2)        TO KEEP CONSISTENCY OF CROSS SECTIONS.         
      (3,4), (3,51-56), (3,59), (3,64)                            
                   DIRECT INELASTIC SCATTERING CONTRIBUTION       
                   WAS INCLUDED.                                  
      (4,51-56), (4,59), (4,64)                                   
                   DIRECT INELASTIC SCATTERING CONTRIBUTIONS.     
     ***********************************************************  
                                                                  
                                                                  
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 4.654 KEV      
    RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2 EVALUATED BY     
    KIKUCHI ET AL./3/ AND WERE MODIFIED FOR JENDL-3.              
      FOR JENDL-2, PARAMETERS WERE ADOPTED FROM RAHN ET AL./4/    
    FOR THE LEVELS WHOSE RADIATION WIDTH WAS NOT MEASURED, THE    
    AVERAGE VALUE OF 0.079+-0.013 EV WAS ASSUMED.  A NEGATIVE     
    RESONANCE WAS ADDED AT -35 EV SO AS TO REPRODUCE THE CAPTURE  
    CROSS SECTION OF 5.5+-1.1 BARNS AT 0.0253 EV/5/.              
      FOR JENDL-3, THE RADIATION WIDTH OF THE NEGATIVE RESONANCE  
    WAS CHANGED FROM 0.079 EV TO 0.1266 EV AND THE SCATTERING     
    RADIUS FROM 8.34 FM TO 9.67 FM SO AS TO REPRODUCE WELL THE    
    THERMAL CROSS SECTIONS (CAPTURE = 8.4 B, SCATTERING = 11 B)   
    COMPILED BY MUGHABGHAB/3/.                                    
                                                                  
  UNRESOLVED RESONANCE REGION : 4.654 KEV - 100 KEV               
    THE NEUTRON STRENGTH FUNCTIONS, S0 AND S1 WERE BASED ON THE   
    COMPILATION OF MUGHABGHAB, AND S2 WAS CALCULATED WITH OPTICAL 
    MODEL CODE CASTHY/6/.  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 GG WAS BASED ON THE COMPILATION OF        
    MUGHABGHAB.                                                   
                                                                  
  TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:                     
    S0 = 1.800E-4, S1 = 0.800E-4, S2 = 2.400E-4, SG = 7.09E-4,    
    GG = 0.079 EV, R  = 7.680 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL          19.39                     -                  
      ELASTIC        11.00                     -                  
      CAPTURE         8.393                    36.2               
                                                                  
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/7/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP     
  EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE 
  DETERMINED TO REPRODUCE THE TOTAL CROSS SECTION OF NATURAL SM   
  MEASURED BY FOSTER AND GLASGOW/8/, KELLIE ET AL./9/ AND SO      
  ON.  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/.  THE      
    LEVELS MARKED WITH * INCLUDE THE CONTRIBUTION OF DIRECT       
    INELASTIC SCATTERING, WHICH WAS CALCUALTED BY THE COUPLED-    
    CHANNELS THEORY WITH ECIS88 CODE/18/.  THE GROUND STATE       
    ROTATIONAL BAND (0+ 2+ 4+ 6+ 8+ 10+) AND OCTUPOLE VIBRATIONAL 
    BAND (1- 3- 5-) WERE COUPLED SIMULTANEOUSLY.  THE WS PARAMETER
    WAS ADJUSTED TO 2.5 MEV,  OTHERWISE THE SPHERICAL PARAMETERS  
    WERE USED.  THE BETA-2 (= 0.3410) AND BETA-3 (= 0.080) WERE   
    TAKEN FROM ORNL COMPILATIONS/19, 20/.                         
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY  C.C. CALCULATION  
           GR.       0.0             0  +                         
            1        0.0820          2  +              *          
            2        0.2670          4  +              *          
            3        0.5470          6  +              *          
            4        0.9060          8  +              *          
            5        0.9210          1  -              *          
            6        1.0120          3  -              *          
            7        1.0990          0  +                         
            8        1.1780          2  +                         
            9        1.1820          5  -              *          
           10        1.2020          0  +                         
           11        1.2860          3  -                         
           12        1.3380          4  +                         
           13        1.3720          4  +                         
           14        1.4010         10  +              *          
           15        1.4400          2  +                         
           16        1.4750          1  -                         
           17        1.5150          3  +                         
           18        1.5390          3  +                         
           19        1.5850          3  -                         
           20        1.6620          4  +                         
           21        1.6740          0  +                         
           22        1.7070          4  +                         
           23        1.7550          2  +                         
           24        1.8170          4  +                         
      LEVELS ABOVE 1.85 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/21/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (5.84E-4) WAS ADJUSTED TO     
    REPRODUCE THE CAPTURE CROSS SECTION OF 70 MILLI-BARNS AT 200  
    KEV MEASURED BY KONONOV ET AL./22/ AND BY FAWCETT ET AL./23/  
                                                                  
  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 (=  25.0) WAS ASSUMED TO BE THE SAME 
    AS THAT OF SM-148.                                            
                                                                  
    FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE          
    NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:               
      (N,P)          2.23  MB (SYSTEMATICS OF FORREST/24/)        
      (N,ALPHA)      0.85  MB (MEASURED BY BARI/25/)              
    THE (N,2N) CROSS SECTION WAS DETERMINED BY EYE-GUIDING OF     
    THE DATA MEASURED BY FREHAUT ET AL./26/                       
                                                                  
  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 FROM OVERLAPPING LEVELS AND FOR
  OTHER NEUTRON EMITTING REACTIONS.                               
                                                                  
TABLE 1  NEUTRON OPTICAL POTENTIAL PARAMETERS                     
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 46.96-0.0172E        R0 = 6.379    A0 = 0.655        
        WS = 8.455                RS = 7.719    AS = 0.448        
        VSO= 7.0                  RSO= 6.861    ASO= 0.6          
  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    
 ---------------------------------------------------------------  
 60-ND-150     2.415E+01 5.280E-01 1.867E+00 7.314E+00 2.290E+00  
 60-ND-151     2.618E+01 4.800E-01 1.152E+01 5.656E+00 1.180E+00  
 60-ND-152  *  2.361E+01 5.242E-01 1.915E+00 6.885E+00 2.100E+00  
 60-ND-153  *  2.297E+01 5.217E-01 7.977E+00 5.732E+00 1.180E+00  
                                                                  
 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  
 61-PM-154  *  2.312E+01 5.193E-01 7.816E+01 4.543E+00 0.0        
                                                                  
 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  
 ---------------------------------------------------------------  
  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 9.75 FOR SM-154 AND 5.0 FOR SM-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) RAHN, F., ET AL.: PHYS. REV., C6, 251 (1972).                 
 5) MUGHABGHAB, S.F. AND GARBER, D.I.: "NEUTRON CROSS SECTIONS,   
    VOL.1, RESONANCE PARAMETERS", BNL 325, 3RD ED., VOL. 1,       
    (1973).                                                       
 6) IGARASI, S. AND FUKAHORI, T.: JAERI 1321 (1991).              
 7) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
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    (1971).                                                       
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    J. PHYS., A7, 1758 (1974).                                    
10) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
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12) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
13) BECCHETTI, F.D., JR. AND GREENLEES, G.W.: POLARIZATION        
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    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) RAYNAL, J. CODE ECIS88                                        
19) RAMAN, S. ET AL.: AT. DATA AND NUCL. DATA TABLES 36, 1 (1987).
20) SPEAR, R.H.: AT. DATA AND NUCL. DATA TABLES 42, 55 (1989).    
21) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
22) KONONOV, V.N., ET AL.: SOV. J. NUCL. PHYS., 27, 5 (1978).     
23) FAWCETT, L.R. JR., ET AL.: NUCL. SCI. ENG., 49, 317 (1972).   
24) FORREST, R.A.: AERE-R 12419 (1986).                           
25) BARI, A.: J. OF RADIOANALYTICAL CHEMISTRY, 75, 189 (1982).    
26) FREHAUT, J., ET AL.: SYMP. ON NEUTRON CROSS SECTIONS FROM     
    10-50MEV, BNL, P.399 (1980).