53-I -127

 53-I -127 JNDC       EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.        
                      DIST-MAY10                       20091112   
----JENDL-4.0         MATERIAL 5325                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
   JENDL-3.2 data were automatically transformed to JENDL-3.3.    
    Interpolation of spectra: 22 (unit base interpolation)        
    (3,251) deleted, T-matrix of (4,2) deleted, and others.       
84-10 Evaluation for JENDL-2 was made by JNDC FPND W.G./1/        
90-03 Modification for JENDL-3 was made/2/.                       
93-09 JENDL-3.2 was made by JNDC FPND W.G.                        
     *****   modified parts for JENDL-3.2   ********************  
      (2,151)       Upper boundary of resolved resonance region   
                    was changed from 4.252 keV to 2 keV.          
09-09 The resolved resonance parameters were taken from the work  
      of Noguere et al./3/ with a modification.  The total        
      cross section was recalculated from partial cross sections. 
      The data were compiled by K.Shibata (jaea).                 
mf = 1  General information                                       
  mt=451 Comments and dictionary                                  
mf = 2  Resonance parameters                                      
  MT=151 Resolved and unresolved resonance parameters             
    Resolved resonance region (RM formula): below 5.2 keV         
      The present evaluation is based on the JEFF-3.1 data        
      obtained by Noguere et al./3/  The energy of a negative     
      resonance was changed to -39.25 eV so as to reproduce the   
      the thermal capture cross section of 6.40+-0.29 b measured  
      by Katoh et al./4/                                          
    Unresolved resonance region : 5.2 keV - 100 keV               
      The parameters were determined to reproduce the total and   
      capture cross sections calculated with CASTHY /5/.          
      The parameters should be used only for self-shielding       
      calculation.The effective scattering                        
    Thermal cross sections and resonance integrals at 300 K       
                     0.0253 eV           res. integ. (*)          
                      (barns)              (barns)                
     Total           9.6571E+00                                   
     Elastic         3.2545E+00                                   
     n,gamma         6.4026E+00           1.5391E+02              
       (*) Integrated from 0.5 eV to 10 MeV.                      
mf = 3  Neutron cross sections                                    
  Below 5.2 keV, resonance parameters were given.                 
  Above 5.2 keV, the spherical optical and statistical model      
  calculation was performed with CASTHY/5/, by taking account of  
  competing reactions, of which cross sections were calculated    
  with PEGASUS/6/ 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 and rso of Iijima-Kawai potential/7/.    
  The OMP's for charged particles are as follows:                 
     proton   = Perey/8/                                          
     alpha    = Huizenga and Igo/9/                               
     deuteron = Lohr and Haeberli/10/                             
     helium-3 and triton = Becchetti and Greenlees/11/            
  Parameters for the composite level density formula of Gilbert   
  and Cameron/12/ were evaluated by Iijima et al./13/  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./15/            
           no.      energy(MeV)    spin-parity                    
           gr.       0.0            5/2 +                         
            1        0.0576         7/2 +                         
            2        0.2028         3/2 +                         
            3        0.3750         1/2 +                         
            4        0.4179         5/2 +                         
            5        0.6184         3/2 +                         
            6        0.6286         7/2 +                         
            7        0.6510         9/2 +                         
            8        0.7165        11/2 +                         
            9        0.7446         9/2 +                         
           10        0.9910         3/2 +                         
      Levels above 1.1 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/16/ and normalized to 1 milli-barn at 14 MeV.       
    The gamma-ray strength function (8.29e-03) was adjusted to    
    reproduce the capture cross section of 760 milli-barns at 25  
    keV measured by Yamamuro et al./17/                           
  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 (= 185.0) was estimated by the       
    formula derived from Kikuchi-Kawai's formalism/18/ and level  
    density parameters.                                           
    Finally, the (n,2n), (n,p) and (n,alpha) cross sections were  
    normalized to the following values at 14.5 MeV:               
      (n,2n)      1800.00  mb (recommended by Bychkov+/19/)       
      (n,p)         16.00  mb (recommended by Forrest/20/)        
      (n,alpha)      1.50  mb (recommended by 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.                               
                DEPTH (MEV)       RADIUS(FM)    DIFFUSENESS(FM)   
         ----------------------   ------------  ---------------   
        V  = 45.97-0.199E         R0 = 6.481    A0 = 0.62         
        WS = 6.502                RS = 6.926    AS = 0.35         
        VSO= 7.0                  RSO= 6.49     ASO= 0.62         
TABLE 2  LEVEL DENSITY PARAMETERS                                 
 51-SB-123     1.585E+01 6.213E-01 1.285E+00 5.469E+00 1.430E+00  
 51-SB-124     1.696E+01 5.600E-01 1.090E+01 3.433E+00 0.0        
 51-SB-125     1.700E+01 5.120E-01 7.883E-01 3.792E+00 1.090E+00  
 51-SB-126     1.700E+01 5.250E-01 7.566E+00 2.897E+00 0.0        
 52-TE-124     1.784E+01 6.740E-01 1.452E+00 8.479E+00 2.570E+00  
 52-TE-125     1.992E+01 5.590E-01 5.035E+00 5.527E+00 1.140E+00  
 52-TE-126     1.706E+01 6.100E-01 5.154E-01 6.554E+00 2.230E+00  
 52-TE-127     2.004E+01 5.380E-01 3.633E+00 5.165E+00 1.140E+00  
 53-I -125  *  1.789E+01 5.895E-01 2.042E+00 5.696E+00 1.430E+00  
 53-I -126  *  1.763E+01 5.871E-01 1.981E+01 4.127E+00 0.0        
 53-I -127     1.717E+01 6.263E-01 4.458E+00 5.757E+00 1.090E+00  
 53-I -128     1.715E+01 6.200E-01 2.329E+01 4.542E+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 7.0 for I -127 and 5.0 for I -128.                 
 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) Noguere G. et al.: Phys. Rev., C74, 054602 (2006).            
 4) Katoh T. et al.: J. Nucl. Sci. Technol., 36, 223 (1999).      
 5) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991).              
 6) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).             
 7) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77      
 8) Perey, F.G: Phys. Rev. 131, 745 (1963).                       
 9) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).       
10) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).    
11) 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.      
12) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446      
13) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).     
14) Gruppelaar, H.: ECN-13 (1977).                                
15) Matsumoto, J., et al.: JAERI-M 7734 (1978).                   
16) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).                   
17) Yamamuro, N., et al.: J. Nucl. Sci. Technol., 17, 582 (1980). 
18) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear        
    Reactions", North Holland (1968).                             
19) Bychkov, V.M. et al.: INDC(CCP)-146/LJ (1980).                
20) Forrest, R.A.: AERE-R 12419 (1986).