44-Ru- 99

 44-Ru- 99 JNDC       EVAL-Mar90 JNDC FP Nuclear Data W.G.        
                      DIST-MAY10                       20091217   
----JENDL-4.0         MATERIAL 4434                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
90-03 New evaluation for JENDL-3 was completed by JNDC FPND       
93-10 JENDL-3.2 was made by JNDC FPND W.G.                        
01-04 Res. params were modified for JENDL-3.3.                    
09-12 Compiled by A.Ichihara.                                     
     *****   Modified parts for JENDL-3.3   ********************  
      (2,151)       Resolved resonance parameters (J-values)      
     *****   Modified parts for JENDL-4.0   ********************  
      (2,151)       Unresolved resonance parameters were updated. 
MF = 1  General information                                       
  MT=451 Comments and dictionary                                  
MF = 2  Resonance parameters                                      
  MT=151 Resolved and unresolved resonance parameters             
  Resolved resonance region (MLBW; below 1 keV)                   
    The data of JENDL-3.3 was adopted. JENDL-3.3 is the same as   
    ** comments to JENDL-3.3 **                                   
    Resonance parameters were evaluated as follows:  Resonance    
    energies, neutron and radiation widths were taken from the    
    measurement of Popov et al./2/ As for lowest two levels, the  
    parameters were taken from the compilation of Mughabghab et   
    al./3/  Total spin J for resonances measured by Popov et al.  
    was tentatively estimated with a random number method.        
    Neutron orbital angular momentum l was estimated with a method
    of Bollinger and Thomas/4/.  Average radiation width of 199   
    meV was deduced and adopted to the levels whose radiation     
    width was unknown.  Scattering radius of 6.1 fm was assumed   
    from the systematics of measured values for neighboring       
    For JENDL-3.2, total spin J was determined based on the       
    measurements of Coceva et al./5/ and with a randum number     
  Unresolved resonance region : 1 keV - 200 keV                   
    The neutron strength functions, S0, S1 and S2 were 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 et al./3/                                       
  Typical values of the parameters at 70 keV:                     
    S0 = 0.440E-4, S1 = 4.200E-4, S2 = 0.600E-4, SG = 79.2E-4,    
    GG = 0.195 eV, R  = 6.224 fm.                                 
    The unresolved resonance parameters were calculated using     
    the ASREP code/7/.                                            
    The parameters should be used only for self-shielding         
    Thermal cross sections and resonance integrals at 300K (b)    
                    0.0253 eV    reson. integ.(*)                 
    total           11.016                                        
    elastic          3.705                                        
    capture          7.312          171                           
         (*) In the energy range from 0.5 eV to 10 MeV.           
MF = 3  Neutron cross sections                                    
  Below 1 keV, resolved resonance parameters were given.          
  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/8/ 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/9/.  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
  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/.           
           No.      Energy(MeV)    Spin-parity                    
           GR.       0.0            5/2 +                         
            1        0.0894         3/2 +                         
            2        0.3221         5/2 +                         
            3        0.3404         7/2 +                         
            4        0.4420         3/2 +                         
            5        0.5755         5/2 +                         
            6        0.6180         7/2 +                         
            7        0.7192         9/2 +                         
            8        1.0480        11/2 +                         
            9        1.0700        11/2 -                         
           10        1.3130        11/2 +                         
           11        1.4960        13/2 +                         
           12        1.5720        15/2 -                         
      Levels above 1.7 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/18/ and normalized to 1 milli-barn at 14 MeV.       
    The gamma-ray strength function (7.80E-03) was determined from
    the radiation width (0.195+-0.020 eV) and average s-wave      
    resonance level spacing (25+-2 eV/3/).                        
  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 (= 126.7) was estimated by the       
    formula derived from Kikuchi-Kawai's formalism/19/ 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)         49.40  mb (systematics of Forrest/20/)        
      (n,alpha)     12.30  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/6/.                                      
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- 95     1.360E+01 7.150E-01 1.847E+00 5.835E+00 1.280E+00  
 42-Mo- 96     1.403E+01 7.410E-01 6.991E-01 7.645E+00 2.400E+00  
 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  
 43-Tc- 96     1.741E+01 5.640E-01 1.503E+01 3.650E+00 0.0        
 43-Tc- 97     1.600E+01 6.700E-01 4.756E+00 6.089E+00 1.120E+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  
 44-Ru- 97     1.510E+01 6.390E-01 1.567E+00 5.300E+00 1.280E+00  
 44-Ru- 98     1.382E+01 7.400E-01 6.070E-01 7.507E+00 2.400E+00  
 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  
 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 12.66 for Ru- 99 and 4.062 for Ru-100.             
 1) Kawai, M. et al.: J. Nucl. Sci. Technol., 29, 195 (1992).     
 2) Ju.P.Popov et al.: Yad. Fiz., 29, 561 (1979).                 
 3) S.F.Mughabghab et al.: "Neutron Cross Sections, Vol. I,       
    Part A", Academic Press (1981).                               
 4) L.M.Bollinger, G.E.Thomas: Phys. Rev., 171,1293(1968).        
 5) C.Coceva et al.: Nucl. Phys., A 117, 586 (1968).              
 6) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991).              
 7) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999)               
     [in Japanese].                                               
 8) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).             
 9) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77      
10) Perey, F.G: Phys. Rev. 131, 745 (1963).                       
11) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).       
12) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).    
13) 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.      
14) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446      
15) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).     
16) Gruppelaar, H.: ECN-13 (1977).                                
17) Lederer, C.M., et al.: "Table of Isotopes, 7th Ed.", Wiley-   
    Interscience Publication (1978).                              
18) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).                   
19) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear        
    Reactions", North Holland (1968).                             
20) Forrest, R.A.: AERE-R 12419 (1986).