33-As- 75

 33-AS- 75 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-SEP90 REV2-FEB94                       
----JENDL-3.2         MATERIAL 3325                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
HISTORY                                                           
90-03 NEW EVALUATION FOR JENDL-3 WAS COMPLETED BY JNDC FPND       
      W.G./1/                                                     
94-02 JENDL-3.2                                                   
       JENDL-3.1 WAS REPLACED WITH JENDL FUSION FILE              
      COMPILED BY T.NAKAGAWA                                      
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      ALL CROSS SECTIONS EXCEPT (3,102).                          
          (3,32), (3,33), (3,105) AND (3,106) WERE DELETED.       
      ALL ANGULAR DISTRIBUTIONS EXCEPT FOR (4,2).                 
      ALL ENERGY DISTRIBUTIONS.                                   
     ***********************************************************  
     -------------------------------------------------------------
      JENDL FUSION FILE /2/  (AS OF FEB. 1994)                    
            EVALUATED BY K.KOSAKO (NEDAC) AND S. CHIBA (NDC/JAERI)
            COMPILED  BY K.KOSAKO.                                
                                                                  
      -  THE INELASTIC SCATTERING CROSS SECTIONS AND ANGULAR      
         DISTRIBUTIONS OF INELASTICALLY SCATTERED NEUTRONS (EXCEPT
         CONTINUUM INELASTIC) WERE CALCULATED WITH CASTHY2Y AND   
         DWUCKY IN SINCROS-II SYSTEM/3/.                          
      -  THE (N,2N), (N,3N), (N,NA), (N,NP), (N,P), (N,D) AND     
         (N,A) REACTION CROSS SECTIONS (MT=16, 17, 22, 28, 103,   
         104, 107) WERE CALCULATED BY EGNASH2 IN THE SINCROS-II.  
      -  THE CAPTURE CROSS SECTION, RESONANCE PARAMETERS AND ANG. 
         DISTRIBUTIONS OF ELASTICALLY SCATTERED NEUTRONS WERE     
         TAKEN FROM JENDL-3.1.                                    
      -  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE CALCU-   
         LATED BY EGNASH2.  THE DDX'S OF THE CONTINUUM NEUTRONS   
         WERE OBTAINED FROM KUMABE'S SYSTEMATICS /4/ USING        
         F15TOB/2/.  THE PRECOMPOUND TO COMPOUND RATIO WAS        
         CALCULATED BY THE SINCROS- II CODE SYSTEM.               
      -  OPTICAL-MODEL, LEVEL DENSITY AND OTHER PARAMETERS USED IN
         THE SINCROS-II CALCULATION ARE DESCRIBED IN REF./3/.     
         LEVEL SCHEMES WERE DETERMINED ON THE BASIS OF ENSDF/5/.  
     -------------------------------------------------------------
                                                                  
                                                                  
MF = 1  GENERAL INFORMATION                                       
  MT=451 COMMENTS AND DICTIONARY                                  
                                                                  
MF = 2  RESONANCE PARAMETERS (SAME AS JENDL-3.1)                  
  MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS             
  RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 9.7 KEV        
    RESONANCE PARAMETERS FOR THE 39 LEVELS FROM 47.0 TO 2616 EV   
    WERE EVALUATED ON THE BASIS OF THE DATA GIVEN BY MUGHABGHAB ET
    AL./6/  RESONANCE ENERGIES FOR THE 210 LEVELS FROM 2676 TO    
    11960 EV WERE BASED ON THE MEASUREMENT BY MACKLIN/7/.  NEUTRON
    AND RADIATION WIDTHS FOR THE 210 LEVELS WERE DETERMINED BY    
    DIFFERENT METHODS ACCORDING TO THE FOLLOWING THREE CONDITIONS,
    RESPECTIVELY.                                                 
                                                                  
    1) IN CASES WHERE TOTAL WIDTH AND NEUTRON CAPTURE AREA        
    MEASURED BY MACKLIN ARE GIVEN FOR A RESONANCE LEVEL, THE      
    NEUTRON AND RADIATION WIDTHS WERE SIMULTANEOUSLY OBTAINED BY  
    SOLVING A QUADRATIC EQUATION.                                 
                                                                  
    2) IN CASES WHERE NEUTRON CAPTURE AREA MEASURED BY MACKLIN AND
    2G*(NEUTRON WIDTH) GIVEN BY MUGHABGHAB ET AL. ARE AVAILABLE   
    FOR A RESONANCE LEVEL, THE RADIATION WIDTHS WERE DERIVED FROM 
    THE BOTH DATA.                                                
                                                                  
    3) IN CASES WHERE ONLY NEUTRON CAPTURE AREA BY MACKLIN IS     
    AVAILABLE, OR G*(NEUTRON WIDTH) BY MUGHABGHAB ET AL. IS       
    SMALLER THAN NEUTRON CAPTURE AREA BY MACKLIN FOR A RESONANCE  
    LEVEL, THE AVERAGE RADIATION WIDTH OF 318 MEV GIVEN BY MACKLIN
    WAS ADOPTED FOR THE LEVEL.  THE NEUTRON WIDTH WAS DERIVED FROM
    THIS AVERAGE RADIATION WIDTH AND THE NEUTRON CAPTURE AREA.    
                                                                  
    NEUTRON ORBITAL ANGULAR MOMENTUM L OF SOME RESONANCES WAS     
    ESTIMATED WITH A METHOD OF BOLLINGER AND THOMAS/8/.  TOTAL    
    SPIN J OF SOME RESONANCES WAS TENTATIVELY ESTIMATED WITH A    
    RANDOM NUMBER METHOD.  SCATTERING RADIUS WAS TAKEN FROM       
    MUGHABGHAB ET AL.  TWO NEGATIVE RESONANCES WERE ADDED SO AS TO
    REPRODUCE THE THERMAL CAPTURE AND SCATTERING CROSS SECTIONS   
    GIVEN BY MUGHABGHAB ET AL.                                    
                                                                  
  UNRESOLVED RESONANCE REGION : 9.7 KEV - 100 KEV                 
    THE NEUTRON STRENGTH FUNCTION S0 WAS BASED ON THE COMPILATION 
    OF MUGHABGHAB ET AL., AND S1 WAS BASED ON THE SYSTEMATICS OF  
    MUGHABGHAB ET AL., AND S2 WAS CALCULATED WITH OPTICAL MODEL   
    CODE CASTHY/9/.  THE RADIATION WIDTH GG WAS BASED ON THE      
    COMPILATION OF MUGHABGHAB ET AL.  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 70 KEV:                     
    S0 = 1.700E-4, S1 = 1.100E-4, S2 = 0.773E-4, SG = 43.3E-4,    
    GG = 0.300 EV, R  = 7.248 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL           9.930                    -                  
      ELASTIC         5.430                    -                  
      CAPTURE         4.500                    63.9               
                                                                  
MF = 3  NEUTRON CROSS SECTIONS                                    
  BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.                 
                                                                  
  FOR JENDL-3.1, 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/10/ STANDING ON A PREEQUILIBRIUM   
  AND MULTI-STEP EVAPORATION MODEL.  THE OMP'S FOR NEUTRON GIVEN  
  IN TABLE 1 WERE DETERMINED TO REPRODUCE A SYSTEMATIC TREND OF   
  THE TOTAL CROSS SECTION BY CHANGING R0, RS AND RSO OF           
  IIJIMA-KAWAI POTENTIAL/11/.  THE OMP'S FOR CHARGED PARTICLES ARE
  AS FOLLOWS:                                                     
     PROTON   = PEREY/12/                                         
     ALPHA    = HUIZENGA AND IGO/13/                              
     DEUTERON = LOHR AND HAEBERLI/14/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/15/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/16/ WERE EVALUATED BY IIJIMA ET AL./17/  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
  /18/.                                                           
                                                                  
  FOR JENDL-3.2, ALL CROSS SECTION DATA EXCEPT FOR THE ELASTIC    
  SCATTERING AND CAPTURE WERE ADOPTED FROM JENDL FUSION FILE.  THE
  CALCULATION WAS MADE WITH SINCROS-II SYSTEM/3/ BY ADOPTING      
  WALTER-GUSS OMP MODIFIED BY YAMAMURO/3/ FOR NEUTRON, PEREY OMP  
  /19/ FOR PROTON, LEMOS OMP MODIFIED BY ARTHUR AND YOUNG/20/ FOR 
  ALPHA, LOHR-HAEBERLI OMP/21/ FOR DEUTERON, BECCHETTII-GREENLEES 
  OMP/22/ FOR TRITON AND HE-3, AND STANDARD LEVEL DENSITY         
  PARAMETERS OF SINCROS-II SYSTEM.                                
                                                                  
  MT = 1  TOTAL                                                   
    TAKEN FROM JENDL FUSIO FILE.  SPHERICAL OPTICAL MODEL CALCULA-
    ON WITH CASTHY AND MODIFIED WALTER-GUSS POTENTIAL WAS ADOPTED.
                                                                  
  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 BASED ON  
    REF./5/  CONTRIBUTIONS OF THE DIRECT PROCESS WERE CALCULATED  
    FOR THE LEVELS MARKED WITH '*'.                               
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY (DIRECT PROCESS)   
           GR.       0.0            3/2 -                         
            1        0.1986         1/2 -          *              
            2        0.2647         3/2 -          *              
            3        0.2795         5/2 -          *              
            4        0.3039         9/2 +          *              
            5        0.4007         5/2 +          *              
            6        0.4686         1/2 -          *              
            7        0.5722         5/2 -          *              
            8        0.5850         1/2 -                         
            9        0.6177         1/2 -          *              
           10        0.8216         7/2 -          *              
      LEVELS ABOVE 0.823 MEV WERE ASSUMED TO BE OVERLAPPING.      
                                                                  
  MT = 102  CAPTURE (SAME AS JENDL-3.1)                           
    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/23/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (3.84E-03) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION OF 350 MILLI-BARNS AT 50  
    KEV MEASURED BY MACKLIN/7/.                                   
                                                                  
  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 =103  (N,P) CROSS SECTION                                    
  MT =104  (N,D) CROSS SECTION                                    
  MT =107  (N,ALPHA) CROSS SECTION                                
   ADOPTED FROM JENDL FUSION FILE.  THEORETICAL CALCULATION WAS   
   MADE WITH SINCROS-II.  THE RESULTS WERE NORMALIZED TO          
                                                                  
   (N,2N)     0.804-0.991 B IN 13.34-14.93 MEV BY KONNO+/24/,     
   (N,D)+(N,NP) 0.0111 B AT 14.5 MEV (SYSTEMATICS OF FORREST/25/),
   (N,P)     0.0198-0.0172B IN 13.33-14.92 MEV BY KONNO+/24/,     
   (N,A)          0.01007 B AT 13.98 MEV       BY KONNO+/24/.     
                                                                  
  MT = 251  MU-BAR                                                
    CALCULATED WITH CASTHY.                                       
                                                                  
MF = 4  ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS               
 MT=2 (SAME AS JENDL-3.1)                                         
   CALCULATED WITH THE CASTHY CODE/9/.                            
 MT=16, 17, 22, 28, 51-91                                         
   TAKEN FROM JENDL FUSION FILE.                                  
                                                                  
MF = 5  ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS                
 MT=16, 17, 22, 28, 91                                            
   TAKEN FROM JENDL FUSION FILE.                                  
                                                                  
                                                                  
<< THE PARAMETERS USED IN THE CASTHY AND PEGASUS CALCULATIONS. >> 
                                                                  
TABLE 1  NEUTRON OPTICAL POTENTIAL PARAMETERS                     
                                                                  
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 46.0-0.25E           R0 = 5.7      A0 = 0.62         
        WS = 7.0                  RS = 6.2      AS = 0.35         
        VSO= 7.0                  RSO= 5.7      ASO= 0.62         
  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    
 ---------------------------------------------------------------  
 31-GA- 71  *  1.332E+01 9.155E-01 1.399E+01 9.613E+00 1.430E+00  
 31-GA- 72  *  1.390E+01 9.028E-01 9.003E+01 8.399E+00 0.0        
 31-GA- 73     1.269E+01 8.264E-01 1.933E+00 7.808E+00 1.880E+00  
 31-GA- 74  *  1.350E+01 8.784E-01 5.236E+01 7.551E+00 0.0        
                                                                  
 32-GE- 72  *  1.350E+01 9.028E-01 3.062E+00 1.086E+01 2.790E+00  
 32-GE- 73  *  1.409E+01 8.904E-01 1.973E+01 9.644E+00 1.360E+00  
 32-GE- 74  *  1.384E+01 8.784E-01 1.667E+00 1.106E+01 3.240E+00  
 32-GE- 75  *  1.368E+01 8.667E-01 1.100E+01 8.810E+00 1.360E+00  
                                                                  
 33-AS- 73  *  1.369E+01 8.904E-01 1.364E+01 9.389E+00 1.430E+00  
 33-AS- 74     1.132E+01 9.475E-01 1.967E+01 7.033E+00 0.0        
 33-AS- 75     1.250E+01 9.510E-01 6.830E+00 1.008E+01 1.880E+00  
 33-AS- 76     1.330E+01 7.860E-01 1.900E+01 5.611E+00 0.0        
 ---------------------------------------------------------------  
  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 3.5 FOR AS- 75 AND 5.0 FOR AS- 76.                 
                                                                  
REFERENCES                                                        
 2) CHIBA, S. ET AL.: JAERI-M 92-027, P.35 (1992).                
 3) YAMAMURO, N.: JAERI-M 90-006 (1990).                          
 4) KUMABE, I. ET AL.: NUCL. SCI. ENG., 104, 280 (1990).          
 5) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE, BNL/NNDC.       
 6) KAWAI, M. ET AL.: J. NUCL. SCI. TECHNOL., 29, 195 (1992).     
 7) MACKLIN, R.L.: NUCL. SCI. ENG. 99, 133 (1988).                
 8) BOLLINGER, L.M. AND THOMAS, G.E.: PHYS. REV., 171,1293(1968). 
 9) IGARASI, S. AND FUKAHORI, T.: JAERI 1321 (1991).              
10) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
11) IIJIMA, S. AND KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77      
    (1983).                                                       
12) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
13) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).       
14) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
15) 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).                                                       
16) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
17) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
18) GRUPPELAAR, H.: ECN-13 (1977).                                
19) PEREY, F.G.: PHYS. REV., 131, 745 (1963).                     
20) ARTHUR, E.D. AND YOUNG, P.G.: LA-8626-MS (1980).              
21) LOHR, J.M. AND HAEBERLI W.: NUCL. PHYS., A232, 381 (1974).    
22) BECCHETTI, F.D. JR. AND GREENLEES G.W.: "POLARIZATION         
   PHENOMENA IN NUCL. REACTIONS," UNIV. WISCONSIN PRESS, P.682    
   (1971).                                                        
23) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
24) KONNO, C. ET AL.: JAERI 1329 (1993).                          
25) FORREST, R.A.: AERE-R 12419 (1986).