42-Mo-100

 42-MO-100 JNDC       EVAL-AUG89 JNDC FP NUCLEAR DATA W.G.        
                      DIST-MAY90 REV2-NOV93                       
----JENDL-3.2         MATERIAL 4249                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
HISTORY                                                           
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/        
89-08 MODIFICATION FOR JENDL-3 WAS MADE/2/.                       
90-10 MF=5: SPECTRA AT THRESHOLD ENERGIES WERE MODIFIED.          
93-11 JENDL-3.2.                                                  
      COMPILED BY T.NAKAGAWA (NDC/JAERI)                          
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (2,151)       UNRESOLVED RESONANCE PARAMETERS               
      (3,1)         CALCULATED FROM NEW OPTICAL POTENTIAL         
      (3,4), (3,51-91), (3,16), (3,17), (3,22), (3,28)            
                    TAKEN FROM JENDL FUSION FILE                  
      (3,32)        DELETED                                       
      (4,16-91)     TAKEN FROM JENDL FUSION FILE                  
      (5,16-91)     TAKEN FROM JENDL FUSION FILE                  
     ***********************************************************  
                                                                  
     -------------------------------------------------------------
      JENDL FUSION FILE /3/  (AS OF OCT. 1993)                    
        EVALUATED BY K.KOSAKO(NEDAC) AND S.CHIBA (NDC/JAERI)      
        COMPILED BY K.KOSAKO                                      
                                                                  
          THE INELASTIC SCATTERING, (N,2N), (N,3N), (N,NP), (N,NA)
        CROSS SECTIONS WERE CALCULATED WITH SINCROS-II SYSTEM /4/.
        THE OTHER CROSS SECTIONS WERE TAKEN FROM JENDL-3.1.  MF=6 
        OF MT=16, 17, 22, 28 AND 91 WERE CREATED WITH F15TOB      
        PROGRAM /3/ IN WHICH KUMABE'S SYSTEMATICS /5/ WAS USED.   
        THE PRECOMPOUND/COMPOUND RATIO WAS CALCULATED BY THE      
        SINCROS-II CODE SYSTEM/4/.                                
          OPTICAL-MODEL, LEVEL DENSITY AND OTHER PARAMETERS USED  
        IN THE SINCROS-II CALCULATION ARE DESCRIBED IN REF./4/.   
        LEVEL SCHEMES WERE DETERMINED ON THE BASIS OF ENSDF/6/.   
     -------------------------------------------------------------
                                                                  
                                                                  
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 26 KEV         
    PARAMETERS WERE TAKEN FROM JENDL-2 WHICH WAS EVALUATED BY     
    KIKUCHI ET AL./7/ ON THE BASIS OF THE FOLLOWING EXPERIMENTAL  
    DATA:                                                         
       TRANSMISSION : WEIGMANN ET AL./8/                          
       CAPTURE      : WEIGMANN ET AL./9/, MUSGROVE ET AL./10/     
    AVERAGE RADIATION WIDTHS OF 0.065 EV AND 0.08 EV WERE ADOPTED 
    TO S-WAVE AND P-WAVE RESONANCES, RESPECTIVELY.  A NEGATIVE    
    RESONANCE WAS ADDED AT -172 EV SO AS TO REPRODUCE THE THERMAL 
    CAPTURE CROSS SECTION GIVEN BY MUGHABGHAB ET AL./11/          
    SCATTERING RADIUS WAS TAKEN FROM REF./11/.                    
                                                                  
  UNRESOLVED RESONANCE REGION : 26 KEV - 100 KEV                  
    THE NEUTRON STRENGTH FUNCTIONS, S0, S1 AND S2 WERE CALCULATED 
    WITH OPTICAL MODEL CODE CASTHY/12/.  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.                                                      
                                                                  
  TYPICAL VALUES OF THE PARAMETERS AT 50 KEV:                     
    S0 = 0.370E-4, S1 = 5.479E-4, S2 = 0.365E-4, SG = 1.58E-4,    
    GG = 0.085 EV, R  = 6.308 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL           5.499                    -                  
      ELASTIC         5.300                    -                  
      CAPTURE         0.1990                    3.91              
                                                                  
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/13/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP    
  EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN IN TABLE 1(A)   
  WERE DETERMINED BY IIJIMA AND KAWAI/14/ TO REPRODUCE A SYSTEMA- 
  TIC TREND OF THE TOTAL CROSS SECTION.  THIS SET WAS USED FOR    
  CALCULATION OF THE CAPTURE CROSS SECTION WITH CASTHY AND THE    
  PEGASUS CALCULATION, AND ANGULAR DISTRIBUTIONS OF ELASTICALLY   
  SCATTERED NEUTRONS.  ANOTHER SET OF PARAMETERS IN TABLE 1(B) WAS
  DETEMINED BY WATANABE/15/ TO FIT BETTER THE MEASUED TOTAL CROSS 
  SECTION, AND WAS USED FOR THE TOTAL CROSS SECTION CALCULATION   
  FOR JENDL-3.2.  THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS: 
     PROTON   = PEREY/16/                                         
     ALPHA    = HUIZENGA AND IGO/17/                              
     DEUTERON = LOHR AND HAEBERLI/18/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/19/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/20/ WERE EVALUATED BY IIJIMA ET AL./21/  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
  /22/.                                                           
                                                                  
     FOR JENDL-3.2, THE INELASTIC SCATTERING, (N,2N), (N,3N),     
  (N,NP), (N,NA) CROSS SECTIONS WERE ADOPTED FROM JENDL FUSION    
  FILE.  THE CALCULATION WAS MADE WITH SINCROS-II SYSTEM/4/ BY    
  ADOPTIG WALTER-GUSS OMP MODIFIED BY YAMAMURO/4/ FOR NEUTRONS,   
  LEMOS OMP MODIFIED BY ARTHUR AND YOUNG/23/ FOR ALPHA, THE SAME  
  OMP'S AS THE PEGASUS CALCULATION FOR OTHER CHARGED PARTICLES AND
  STANDARD LEVEL DENSITY PARAME- TERS OF SINCROS-II SYSTEM.       
                                                                  
  MT = 1  TOTAL                                                   
    SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED.  OPTICAL     
    POTENTIAL PARAMETERS ARE GIVEN IN TABLE 1(B).                 
                                                                  
  MT = 2  ELASTIC SCATTERING                                      
    CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).        
                                                                  
  MT = 4, 51 - 91  INELASTIC SCATTERING                           
    TAKEN FROM JENDL FUSION FILE.  THE LEVEL SCHEME WAS TAKEN FROM
    REF./6/  CNTRIBUTIONS OF THE DIRECT PROCESS WAS CALCULATED    
    FOR THE LEVELS MARKED WITH '*'.                               
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY (DIRECT PROCESS)   
           GR.       0.0             0  +                         
            1        0.5356          2  +          *              
            2        0.6944          0  +                         
            3        1.0637          2  +                         
            4        1.1361          4  +                         
      LEVELS ABOVE 1.136 MEV WERE ASSUMED TO BE OVERLAPPING.      
                                                                  
  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                                  
    THESE CROSS SECTIONS WERE ADOPTED FROM JENDL FUSION FILE.     
    THE (N,2N) CROSS SECTION CALCULATED WITH SINCROS-II WAS       
    MULTIPLIED BY 1.08.                                           
                                                                  
  MT = 102  CAPTURE                                               
    SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH      
    CASTHY WAS ADOPTED.  OPTICAL POTENTIAL PARAMETERS ARE LISTED  
    IN TABLE 1(A).  DIRECT AND SEMI-DIRECT CAPTURE CROSS SECTIONS 
    WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI AND        
    REFFO/24/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.           
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (1.43E-04) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION MEASURED BY MUSGROVE ET   
    AL./10/                                                       
                                                                  
  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 (=50.6 ) WAS ESTIMATED BY THE        
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/25/ AND LEVEL  
    DENSITY PARAMETERS.                                           
                                                                  
    FINALLY, (N,P) AND (N,ALPHA) CROSS SECTIONS WERE NORMALIZED TO
    THE FOLLOWING VALUES AT 14.5 MEV:                             
      (N,P)          2.50  MB (RECOMMENDED BY FORREST/26/)        
      (N,ALPHA)      2.80  MB (MEASURED BY IKEDA ET AL./27/)      
                                                                  
  MT = 251  MU-BAR                                                
    CALCULATED WITH CASTHY.                                       
                                                                  
MF = 4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS               
  MT = 2                                                          
    CALCULATED WITH CASTHY/12/ AND OMP IN TABLE 1(A).             
  MT = 51-54                                                      
    TAKEN FROM JENDL FUSION FILE DATA WHICH WAS CALCULATED WITH   
    CASTHY AND DWUCK/28/ IN THE SINCROS-II SYSTEM.                
  MT = 16,17,22,28,91                                             
    TRANSFORMED FROM MF=6 DATA (DDX) OF JENDL FUSION FILE.        
                                                                  
MF = 5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                
  MT = 16,17,22,28,91                                             
    TRANSFORMED FROM MF=6 DATA (DDX) OF JENDL FUSION FILE.        
                                                                  
                                                                  
================================================================= 
<> 
================================================================= 
                                                                  
TABLE 1(A)  NEUTRON OPTICAL POTENTIAL PARAMETERS                  
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 46.0-0.25E           R0 = 5.893    A0 = 0.62         
        WS = 7.0                  RS = 6.393    AS = 0.35         
        VSO= 7.0                  RSO= 5.893    ASO= 0.62         
  THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.   
                                                                  
TABLE 1(B)  NEUTRON OPTICAL POTENTIAL PARAMETERS                  
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 49.29-0.5266E        R0 = 1.270    A0 = 0.664        
        WS = 6.574+0.5038E        RS = 1.264    AS = 0.538        
        VSO= 9.0                  RSO= 1.201    ASO= 0.367        
                                   * COEFFICIENTS OF A**(1/3)     
  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    
 ---------------------------------------------------------------  
 40-ZR- 96     1.320E+01 7.000E-01 2.235E-01 6.589E+00 2.490E+00  
 40-ZR- 97     1.259E+01 5.590E-01 2.497E-01 3.084E+00 1.200E+00  
 40-ZR- 98  *  1.725E+01 6.633E-01 1.790E+00 7.555E+00 2.140E+00  
 40-ZR- 99  *  1.831E+01 6.566E-01 1.170E+01 6.957E+00 1.200E+00  
                                                                  
 41-NB- 97     1.337E+01 6.710E-01 9.771E-01 5.026E+00 1.290E+00  
 41-NB- 98     1.380E+01 5.110E-01 2.350E+00 1.731E+00 0.0        
 41-NB- 99  *  1.742E+01 6.566E-01 1.085E+01 6.300E+00 9.400E-01  
 41-NB-100  *  1.850E+01 6.500E-01 7.329E+01 5.699E+00 0.0        
                                                                  
 42-MO- 98     1.594E+01 6.900E-01 7.358E-01 7.888E+00 2.570E+00  
 42-MO- 99     1.774E+01 6.200E-01 4.294E+00 6.058E+00 1.280E+00  
 42-MO-100     1.780E+01 6.000E-01 6.702E-01 6.645E+00 2.220E+00  
 42-MO-101     2.085E+01 5.650E-01 7.153E+00 6.092E+00 1.280E+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 5.125 FOR MO-100 AND 5.000 FOR MO-101.             
                                                                  
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) CHIBA, S. ET AL.: JAERI-M 92-027, P.35 (1992).                
 4) YAMAMURO, N.: JAERI-M 90-006 (1990).                          
 5) KUMABE, I. ET AL.: NUCL. SCI. ENG., 104, 280 (1990).          
 6) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE, BNL/NNDC.       
 7) KIKUCHI, Y. ET AL.: JAERI-M 86-030 (1986).                    
 8) WEIGMANN, H. ET AL.: PHYS. REV., C20, 115 (1969).             
 9) WEIGMANN, H. ET AL.: 1971 KNOXVILLE, 749 (1971).              
10) MUSGROVE, A.R.DE L. ET AL.: NUCL. PHYS., A270, 108 (1976).    
11) MUGHABGHAB, S.F. ET AL.: "NEUTRON CROSS SECTIONS, VOL. I,     
    PART A", ACADEMIC PRESS (1981).                               
12) IGARASI, S. AND FUKAHORI, T.: JAERI 1321 (1991).              
13) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
14) IIJIMA, S. AND KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77      
    (1983).                                                       
15) WATANABE, T.: PRIVALE COMMUNICATION (1993).                   
16) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
17) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).       
18) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
19) 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).                                                       
20) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
21) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
22) GRUPPELAAR, H.: ECN-13 (1977).                                
23) ARTHUR, E.D. AND YOUNG, P.G.: LA-8626-MS (1980).              
24) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
25) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR        
    REACTIONS", NORTH HOLLAND (1968).                             
26) FORREST, R.A.: AERE-R 12419 (1986).                           
27) IKEDA, Y. ET AL.: JAERI 1312 (1988).                          
28) KUNZ, P.D.: PRIVATE COMMUNICATION.