62-Sm-149

 62-SM-149 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-NOV90                                  
----JENDL-3.2         MATERIAL 6240                               
-----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/.                       
                                                                  
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 0.52 KEV       
       PARAMETERS WERE BASED ON JENDL-2 WHICH WERE EVALUATED BY   
    KIKUCHI ET AL./3/ AS FOLLOWS:  PARAMETERS OF THE LOWEST 2     
    LEVELS WERE EVALUATED ON THE BASIS OF DATA MEASURED BY AKYUEZ 
    ET AL./4/, ASAMI ET AL./5/ AND PATTENDEN/6/.  THE DATA OF     
    MIZUMOTO/7/ WERE ADOPTED FOR OTHER RESONANCES.  THE J VALUES  
    WERE DETERMINED ACCORDING TO MARSHAK/8/, CAUVIN ET AL./9/,    
    KARZHAVINA ET AL./10/ AND BECVAR ET AL./11/ RADIATION WIDTHS  
    HAVE BEEN MEASURED FOR SEVEN RESONANCES AND THEIR AVERAGE     
    VALUE OF 62 MEV WAS USED AS A RECOMMENDED VALUE.              
       FOR JENDL-3, TOTAL SPIN J OF SOME RESONANCES WAS           
    TENTATIVELY ESTIMATED WITH A RANDOM NUMBER METHOD.  THE       
    PARAMETERS OF THE 1ST LEVEL WERE MODIFIED SO AS TO REPRODUCE  
    THE THERMAL CAPTURE CROSS SECTION AND RESONANCE INTEGRAL/12/. 
                                                                  
  UNRESOLVED RESONANCE REGION : 0.52 KEV - 100 KEV                
    THE NEUTRON STRENGTH FUNCTIONS, S0 AND S1 WERE BASED ON THE   
    COMPILATION OF MUGHABGHAB/12/, AND S2 WAS CALCULATED WITH     
    OPTICAL MODEL CODE CASTHY/13/.  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 = 4.600E-4, S1 = 0.300E-4, S2 = 4.900E-4, SG = 487.E-4,    
    GG = 0.062 EV, R  = 7.900 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL       40330                        -                  
      ELASTIC       175.8                      -                  
      CAPTURE     40150                      3490                 
     (N,ALPHA)        0.0308                                      
                                                                  
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/14/ 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/15/, KELLIE ET AL./16/ AND SO ON,
  AND THE S-WAVE NEUTRON STRENGTH FUNCTION OF (4.6+-0.6)E-4/12/.  
  THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:                 
     PROTON   = PEREY/17/                                         
     ALPHA    = HUIZENGA AND IGO/18/                              
     DEUTERON = LOHR AND HAEBERLI/19/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/20/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/21/ WERE EVALUATED BY IIJIMA ET AL./22/  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
  /23/.                                                           
                                                                  
  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./24/.           
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GR.       0.0            7/2 -                         
            1        0.0225         5/2 -                         
            2        0.2770         5/2 -                         
            3        0.2859         9/2 -                         
            4        0.3500         3/2 -                         
            5        0.3990         1/2 -                         
            6        0.5285         3/2 -                         
            7        0.5584         5/2 -                         
            8        0.5909         9/2 -                         
            9        0.6060         3/2 -                         
           10        0.6364         7/2 -                         
      LEVELS ABOVE 0.65 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/25/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (324.E-4) WAS ADJUSTED TO     
    REPRODUCE THE CAPTURE CROSS SECTION OF 1200 MILLI-BARNS AT 50 
    KEV MEASURED BY MACKLIN/26/.                                  
                                                                  
  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 (=  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)          8.10  MB (SYSTEMATICS OF FORREST/27/)        
      (N,ALPHA)      3.02  MB (SYSTEMATICS OF FORREST)            
                                                                  
    THE (N,ALPHA) CROSS SECTION BELOW 0.52 KEV WAS CALCULATED FROM
    RESONANCE PARAMETERS, BY ASSUMING A MEAN ALPHA WIDTH OF       
    4.82E-8 EV SO AS TO REPRODUCE THE THERMAL CROSS SECTION/12/.  
    THE CROSS SECTION WAS AVERAGED IN SUITABLE ENERGY INTERVALS.  
    ABOVE 0.52 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 FROM OVERLAPPING LEVELS AND FOR
  OTHER NEUTRON EMITTING REACTIONS.                               
                                                                  
TABLE 1  NEUTRON OPTICAL POTENTIAL PARAMETERS                     
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 43.42-0.1879E        R0 = 7.184    A0 = 0.6          
        WS = 9.875-0.0019E        RS = 7.072    AS = 0.45         
        VSO= 7.0                  RSO= 7.184    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-145     2.054E+01 5.120E-01 2.465E+00 4.869E+00 1.180E+00  
 60-ND-146     2.019E+01 5.660E-01 1.121E+00 6.714E+00 2.100E+00  
 60-ND-147     2.398E+01 4.850E-01 5.510E+00 5.235E+00 1.180E+00  
 60-ND-148     2.359E+01 5.150E-01 1.328E+00 6.751E+00 2.170E+00  
                                                                  
 61-PM-146  *  1.942E+01 5.387E-01 2.241E+01 3.849E+00 0.0        
 61-PM-147     2.192E+01 4.913E-01 4.801E+00 4.589E+00 9.200E-01  
 61-PM-148     2.227E+01 4.300E-01 1.420E+01 2.672E+00 0.0        
 61-PM-149     2.377E+01 4.890E-01 8.141E+00 5.075E+00 9.900E-01  
                                                                  
 62-SM-147     2.275E+01 4.770E-01 2.660E+00 4.823E+00 1.220E+00  
 62-SM-148     2.097E+01 5.505E-01 1.055E+00 6.694E+00 2.140E+00  
 62-SM-149     2.325E+01 5.052E-01 5.886E+00 5.504E+00 1.220E+00  
 62-SM-150     2.362E+01 5.230E-01 1.520E+00 6.973E+00 2.210E+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 5.300 FOR SM-149 AND 5.475 FOR SM-150.             
                                                                  
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) KIKUCHI, Y. ET AL.: JAERI-M 86-030 (1986).                    
 4) AKYUEZ, OE.R., ET AL.: CNAEM-52 (1968).                       
 5) ASAMI, T., ET AL.: J. PHYS. SOC. JPN., 26, 225 (1969).        
 6) PATTENDEN, N.J.: NUCL. SCI. ENG., 17, 371 (1963).             
 7) MIZUMOTO, M.: NUCL. PHYS., A357, 90 (1981).                   
 8) MARSHAK, H., ET AL.: PHYS. REV., 128, 1287 (1967).            
 9) CAUVIN, B., ET AL.: "PROC. 3RD CONF. ON NEUTRON CROSS SECTIONS
    AND TECHNOL., KNOXVILLE 1971", 785.                           
10) KARZHAVINA, E.N., ET AL. JINER-P3-6237 (1972).                
11) BECVAR, F., ET AL.: NUCL. PHYS., A236, 173 (1974).            
12) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",   
    ACADEMIC PRESS (1984).                                        
13) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).           
14) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
15) FOSTER, D.G. JR. AND GLASGOW, D.W.: PHYS. REV., C3, 576       
    (1971).                                                       
16) KELLIE, J.D., HALL, S.J. AND CRAWFORD, G.I. ET AL.:           
    J. PHYS., A7, 1758 (1974).                                    
17) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
18) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).       
19) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
20) 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).                                                       
21) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
22) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
23) GRUPPELAAR, H.: ECN-13 (1977).                                
24) LEDERER, C.M., ET AL.: "TABLE OF ISOTOPES, 7TH ED.", WILEY-   
    INTERSCIENCE PUBLICATION (1978).                              
25) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
26) MACKLIN, R.: TAKEN FROM EXFOR 12966 (1986).                   
27) FORREST, R.A.: AERE-R 12419 (1986).