44-Ru-101

 44-RU-101 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-SEP90 REV2-OCT93                       
----JENDL-3.2         MATERIAL 4440                               
-----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/.                       
93-10 JENDL-3.2 WAS MADE BY JNDC FPND W.G.                        
                                                                  
     *****   MODIFIED PARTS FOR JENDL-3.2   ********************  
      (2,151)       SMALL CHANGE IN UNRESOLVED RES. PARAMTERS     
      (3,2), (3,4), (3,51-91), (3,102)                            
      (4,51-91)                                                   
                    LEVEL SCHEME FOR INELASTIC SCATTERING CROSS   
                    SECTIONS WERE REPLACED.                       
     ***********************************************************  
                                                                  
                                                                  
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 1.06 KEV       
    RESONANCE PARAMETERS OF JENDL-2 WERE MODIFIED ACCORDING TO NEW
    EXPERIMENTAL DATA.                                            
       FOR JENDL-2, PARAMETERS WERE DETERMINED FROM THE EXPERIMEN-
    TAL DATA OF PRIESMEYER AND JUNG/3/ AND POPOV ET AL./4/        
    VALUES OF SPIN J WERE BASED ON THE DATA OF COCEVA ET AL./5/   
    A NEGATIVE RESONANCE WAS ADDED AT -20 EV TO REPRODUCE THE     
    CAPTURE CROSS SECTION OF 3.4+-0.9 BARNS AT 0.0253 EV/6/.      
    AVERAGE RADIATION WIDTH  OF 0.180+-0.022 EV WAS DEDUCED, AND  
    ADOPTED TO THE LEVELS WHOSE RADIATION WIDTH WAS UNKNOWN.      
       FOR JENDL-3, PARAMETERS OF 40 LEVELS WERE REEVALUATED ON   
    THE BASIS OF THE NEW EXPERIMENTAL DATA OF ANUFRIEV/7/ FOR     
    NEUTRON WIDTHS.  RADIATION WIDTHS AND TOTAL SPIN J OF         
    SEVERAL LEVELS WERE ALSO REVISED ACCORDING TO ANUFRIEV'S      
    DATA.  SCATTERING RADIUS WAS MODIFIED TO 6.1 FM.  TOTAL SPIN  
    J OF SOME RESONANCES WAS TENTATIVELY ESTIMATED WITH A RANDOM  
    NUMBER METHOD.  NEUTRON ORBITAL ANGULAR MOMENTUM L OF SOME    
    RESONANCES WAS DETERMINED WITH A METHOD OF BOLLINGER AND      
    THOMAS/8/.                                                    
                                                                  
  UNRESOLVED RESONANCE REGION : 1.06 KEV - 100 KEV                
    THE PARAMETERS WERE ADJUSTED TO REPRODUCE THE CAPTURE CROSS   
    SECTION MEASURED BY MACKLIN ET AL./9,10/  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 = 0.59E-4, S1 = 6.10E-4, S2 = 0.54E-4, SG = 105.E-4,       
    GG = 0.173 EV, R  = 5.062 FM.                                 
                                                                  
  CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)   
                     2200 M/S               RES. INTEG.           
      TOTAL           7.100                    -                  
      ELASTIC         3.741                    -                  
      CAPTURE         3.359                   100                 
                                                                  
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/11/, BY TAKING ACCOUNT OF 
  COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED    
  WITH PEGASUS/12/ 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 RSO OF IIJIMA-KAWAI POTENTIAL/13/.  THE     
  OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:                     
     PROTON   = PEREY/14/                                         
     ALPHA    = HUIZENGA AND IGO/15/                              
     DEUTERON = LOHR AND HAEBERLI/16/                             
     HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/17/            
  PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT   
  AND CAMERON/18/ WERE EVALUATED BY IIJIMA ET AL./19/  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
  /20/.                                                           
                                                                  
  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./21/.           
                                                                  
           NO.      ENERGY(MEV)    SPIN-PARITY                    
           GS        0.0            5/2 +                         
            1        0.12723        3/2 +                         
            2        0.30685        7/2 +                         
            3        0.31133        5/2 +                         
            4        0.32480        1/2 +                         
            5        0.42230        3/2 +                         
            6        0.52750       11/2 -                         
            7        0.53500        5/2 +                         
            8        0.54508        7/2 +                         
            9        0.59830        5/2 -                         
           10        0.61630        3/2 +                         
           11        0.62300        3/2 +                         
           12        0.62350        1/2 +                         
           13        0.68400        3/2 +                         
           14        0.71800        1/2 -                         
           15        0.72000        9/2 +                         
           16        0.82300        3/2 +                         
           17        0.84278        7/2 +                         
           18        0.90800        1/2 -                         
           19        0.92700        3/2 +                         
           20        0.92872        9/2 +                         
           21        0.93847        7/2 +                         
           22        0.97340        5/2 +                         
           23        1.0012        11/2 +                         
           24        1.0410         3/2 +                         
           25        1.0510         7/2 +                         
           26        1.0980         1/2 +                         
           27        1.1100         1/2 +                         
           28        1.1690         3/2 +                         
      LEVELS ABOVE 1.2068 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/22/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.       
                                                                  
    THE GAMMA-RAY STRENGTH FUNCTION (1.16E-02) WAS ADJUSTED TO    
    REPRODUCE THE CAPTURE CROSS SECTION OF 500 MILLI-BARNS AT 100 
    KEV MEASURED BY MACKLIN ET AL./9,10/                          
                                                                  
  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 =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 (= 106.5) WAS ESTIMATED BY THE       
    FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/23/ AND LEVEL  
    DENSITY PARAMETERS.                                           
                                                                  
    FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE          
    NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:               
      (N,P)         24.00  MB (SYSTEMATICS OF FORREST/24/)        
      (N,ALPHA)      6.07  MB (SYSTEMATICS OF FORREST)            
                                                                  
  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  = 47.5                 R0 = 5.972    A0 = 0.62         
        WS = 9.74                 RS = 6.594    AS = 0.35         
        VSO= 7.0                  RSO= 5.97     ASO= 0.62         
  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    
 ---------------------------------------------------------------  
 42-MO- 97     1.517E+01 6.800E-01 2.769E+00 6.036E+00 1.280E+00  
 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  
                                                                  
 43-TC- 98     1.659E+01 6.120E-01 1.776E+01 4.176E+00 0.0        
 43-TC- 99     1.600E+01 6.550E-01 2.973E+00 5.984E+00 1.290E+00  
 43-TC-100     1.637E+01 5.850E-01 1.189E+01 3.635E+00 0.0        
 43-TC-101     1.675E+01 6.440E-01 6.361E+00 5.761E+00 9.400E-01  
                                                                  
 44-RU- 99     1.650E+01 6.570E-01 4.016E+00 6.235E+00 1.280E+00  
 44-RU-100     1.520E+01 7.200E-01 7.835E-01 8.078E+00 2.570E+00  
 44-RU-101     1.726E+01 6.700E-01 7.228E+00 6.836E+00 1.280E+00  
 44-RU-102     1.643E+01 6.550E-01 8.872E-01 7.106E+00 2.220E+00  
 ---------------------------------------------------------------  
                                                                  
 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 14.30 FOR RU-101 AND 7.654 FOR RU-102.             
                                                                  
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) PRIESMEYER, H.G.,JUNG, H.H.: ATOMKERNENERGIE, 19, 111 (1972). 
 4) POPOV, JU.P., ET AL.: YAD. FIZ., 29, 561 (1979).              
 5) COCEVA, C., ET AL.: NUCL. PHYS., A 117, 586 (1968).           
 6) MUGHABGHAB, S.F. ET AL.: "NEUTRON CROSS SECTIONS, VOL. I,     
    PART A", ACADEMIC PRESS (1981).                               
 7) ANUFRIEV, V.A. ET AL.: ATOM. ENERGIYA, 58, 279 (1985).        
 8) BOLLINGER, L.M. AND THOMAS, G.E.: PHYS. REV., 171,1293(1968). 
 9) MACKLIN, R.L., ET AL.: "PROC. SPECIALISTS' MEETING ON NEUTRON 
    CROSS SECTIONS OF FISSION PRODUCTS, BOLOGNA 1979", NEANDC(E)  
    209L, 103.                                                    
10) MACKLIN, R.L., WINTERS, R.R.: NUCL. SCI. ENG., 78, 110(1981). 
11) IGARASI, S. AND FUKAHORI, T. JAERI 1321 (1991).               
12) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).             
13) IIJIMA, S. AND KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77      
    (1983).                                                       
14) PEREY, F.G: PHYS. REV. 131, 745 (1963).                       
15) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).       
16) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).    
17) 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).                                                       
18) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446      
    (1965).                                                       
19) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).     
20) GRUPPELAAR, H.: ECN-13 (1977).                                
21) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE (OCT. 1993).     
22) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).                   
23) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR        
    REACTIONS", NORTH HOLLAND (1968).                             
24) FORREST, R.A.: AERE-R 12419 (1986).