24-Cr- 52

 24-CR- 52 NEDAC      EVAL-MAR87 T.ASAMI(NEDAC)                   
                      DIST-MAR02 REV3-FEB02            20020214   
----JENDL-3.3         MATERIAL 2431                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
HISTORY                                                           
87-03  New evaluation was made by T.Asami.                        
88-12  mf/mt=3/107 modified.                                      
93-09  JENDL-3.2.                                                 
       Compiled by T.Nakagawa (ndc/jaeri)                         
00-03  Reevaluation was made by T.Asami.                          
02-01  Compiled and modified  by K.Shibata (ndc/jaeri)            
                                                                  
     *****   modified parts for JENDL-3.3   ********************  
      (2,151)              revised                                
      (3,1)                background cross section adpted below  
                           855 keV                                
      (3,2)                re-calculated                          
      (3,16,22,28,102,107)         revised                        
      (3,104,105,106,111,203,207)  evaluated newly                
      (3,251)              deleted                                
      (4,2)                transformation matrix deleted          
      (4,16,22,28,91)      deleted                                
      (5,16,22,28,91)      deleted                                
      (6,16,22,28,91)      taken from JENDL fusion file           
      (6,203, 207)         taken from JENDL fusion file           
      (12,16-107)          evaluated newly                        
      (14,16-107)          isotropic distribution                 
      (15,16-107)          evaluated newly                        
      (33,1-107)           taken from JENDL-3.2 covariance file   
      (34,2)               taken from JENDL-3.2 covariance file   
     ***********************************************************  
02-02  Covariances for mf/mt=3/16 were estimated by T. Asami.     
                                                                  
                                                                  
                                                                  
mf=1  General information                                         
 mt=451  Descriptive data and dictionary                          
                                                                  
mf=2  Resonance parameters                                        
 mt=151  Resolved resonance parameters                            
   Resolved parameters for Reich-Moore formula were given in the  
   energy region from 1.0e-5 eV to 855 keV. Evaluated mainly based
   Allen+77/6/, Kenny+77/7/, Agrawal+84/8/, Brusegan+86/9/ and    
   Rohr+89/10/                                                    
   Effective scattering radius = 5.2 fm /10/                      
                                                                  
    calculated 2200 m/s cross sections and resonance integral     
            2200 m/s cross section(b)     res. integral(b)        
    elastic      3.03                                             
    capture      0.78                        0.47                 
    total        3.80                                             
                                                                  
mf=3  Neutron cross sections                                      
    Below 855 keV, background cross section was given.            
    Above 855 keV, the total and partial cross sections were given
    pointwise.                                                    
                                                                  
 mt=1 Total                                                       
    Below 855 keV, given by the resonance parameters and the back-
    ground cross section determined so as to reproduce the experi-
    mental data of elemental Cr.                                  
    Above 855 keV, optical and statistical model calculation was  
    made with the casthy code/11/.                                
     The optical potential parameters used are                    
     V = 46.78 - 0.262*En,    Vso = 7.0     (MeV)                 
     Ws = 4.87 + 0.352*En,      Wv = 0      (MeV)                 
      r = 1.30,  rs = 1.40,  rso = 1.30     (fm)                  
      a = 0.55,   b = 0.40,  aso = 0.48     (fm)                  
       Surface imaginary part is in derivative Woods-Saxon form.  
                                                                  
 mt=2 Elastic scattering                                          
    Obtained by subtracting the sum of the partial cross sections 
    from the total cross section.                                 
                                                                  
 mt=4, 51-62, 91 Inelastic scattering                             
    Calculated with the casthy code/11/, taking account of the    
    contribution from the competing processes and using the       
    discrete level data/3/ shown below.  The contributions from   
    the direct process for the levels marked with '*' were        
    calculated with the dwuck code/12/. The deformation parameters
    used in the calculation were assumed based on a weak coupling 
    model.                                                        
                                                                  
              level energy(MeV)   spin-parity                     
        g.s.      0.0                 0+                          
          1       1.4341              2+         *                
          2       2.3696              4+         *                
          3       2.6470              0+                          
          4       2.7677              4+                          
          5       2.9648              2+         *                
          6       3.1138              6+         *                
          7       3.1617              2+         *                
          8       3.4152              4+                          
          9       3.4722              3+                          
         10       3.6158              5+                          
         11       3.7000              2+                          
         12       3.7717              2+                          
       Levels above 3.8 MeV were assumed to be overlapping.       
                                                                  
                                                                  
    The data of mt=51 and 52 were modified by considering experi- 
    mental data.  The total inelastic scattering cross section    
    (mt=4) is the sum of mt's from 51 to 91.                      
     (n,n') continuum cross section (mt=91) in the whole energy   
    region and its spectra were taken from the sincros-ii/2/ cal- 
    culation.  Several discrete level scattering cross sections   
    (mt=63, 64, 65, 66) and their angular distribution were delet-
    ed because they were included in the new continuum inelastic  
    scattering cross section(mt=91) taken  from the sincros-ii    
    calculation. The threshold  of mt=91 was changed from 4.65 MeV
    to 3.8 MeV.                                                   
     Optical-model, level density and other parameters used in the
    sincros-ii calculation are described in ref./2/.              
     Level schemes were determined on the basis of ENSDF/3/.      
                                                                  
  mt=16       (n,2n)                                              
    Calculated with the egnash code/2/ to reproduce the experi-   
    mental data of Wenusch+62/13/, Molla+83/14/,Ribansky+85 /15/, 
    Qaim72/16/, Sailer+77/17/, Ikeda+88/18/, Liskien+89/19/ and   
    Wagner+89/20/                                                 
                                                                  
 mt=22       (n,na)                                               
    Obtained from from the sincros-ii calculation made with the   
    with the egnash code/2/.                                      
                                                                  
 mt=28       (n,np)                                               
     Obtained from from the sincros-ii calculation made with the  
    with the egnash code/2/.                                      
                                                                  
 mt=102      capture                                              
    Below 855 keV, created from the resonance parameters.         
    Above 855 keV,calculated with the casthy code/11/ and normali-
    zed to 28.5 mb at 50 keV so as to reproduce the element data  
    of 10 mb, and added the semidirect component calculated with  
    the quick gnash code/28,29/.                                  
                                                                  
 mt=103      (n,p)                                                
     Calculated with the gnash code/2/ and normalized at 14.8 MeV 
    to the recommended value of Forrest/22/.                      
                                                                  
 mt=104      (n,d)                                                
     Obtained from from the sincros-ii calculation made with the  
    the egnash code/2/.                                           
                                                                  
 mt=105      (n,t)                                                
     Obtained from from the sincros-ii calculation made with the  
    the egnash code/2/.                                           
                                                                  
 mt=107      (n,a)                                                
    Calculated with the egnash code/2/ to reproduce the experi-   
    mental data at 14.8 MeV/23,24/.                               
                                                                  
 mt=106, 111 (n,He-3), (n,2p)                                     
     obtained from from the sincros-ii calculation made with the  
    the egnash code/2/.                                           
                                                                  
mf=4  Angular distributions of secondary neutrons                 
 mt=2   Elastic scattering                                        
    Calculated with the casthy code/11/.                          
 mt=51-62   Inelastic scattering                                  
    Calculated with the casthy code/11/ and the dwuck code/12/.   
                                                                  
mf=6  Energy-angle distributions of secondary neutrons            
 mt=16, 22, 28, 91                                                
     The data were created by f15tob program/1/.Modified Kumabe's 
    systematics/26/ was used.  The precompound/compound ratio was 
    taken from the sincros-ii calculation/2/, based on modified   
    Kumabe's systematics/1/.                                      
 mt=203, 207                                                      
    Based on Kalbach's systematics/26/.                           
                                                                  
mf=12  Photon production multiplicities and transition probability
         arrays                                                   
 mt=16, 22, 28, 51-62, 91,103, 104, 107                           
       mt=51-16 were given as the transition probability arrays.  
     mt=16, 22, 28, 91, 102, 103, 104, 107 were calculated with   
     the egnash code/2/ and processed by the gamfil2 code/25/.    
     mt=102 was calculated with the casthy code/11/.              
                                                                  
mf=14  Photon angular distributions                               
 mt=16, 22, 28, 51-62, 91, 102, 103, 104, 107                     
        Assumed to be isotropic distributions                     
                                                                  
mf=15  Continuous photon energy spectra                           
 mt=16, 22, 28, 91, 103, 104, 107                                 
     Calculated with the egnash code/2/.                          
 mt=102                                                           
     Calculated with the casthy code/11/. the spectra at 31 to    
    545 keV were modified based on the experimental data of       
    Igashira/27/.                                                 
                                                                  
mf=33  Covariances of cross sections (ref.30)                     
 mt=1                                                             
    Based on experimental data.  A chi-value was 6.2.             
 mt=2                                                             
    Constructed from mt=1, 16, 22, 28, 51-91, 102, 103, and 107.  
 mt=4                                                             
    Constructed from mt=51-62,91.                                 
 mt=16                                                            
    Based on experimental data.  A chi-value was 2.122.           
    The analysis was done by T. Asami /31/.                       
 mt=22                                                            
    The covariances were obtained by using kalman.  A chi-value   
    was 1.84.                                                     
 mt=28                                                            
    The covariances were obtained by using kalman.  A chi-value   
    was 1.84.                                                     
 mt=51-62,91                                                      
    The covariances were obtained by using kalman.  A chi-value   
    was 12.1.                                                     
 mt=102                                                           
    The covariances were obtained by using kalman.  A chi-value   
    was 0.8.                                                      
 mt=103                                                           
    The covariances were obtained by using kalman.  A chi-value   
    was 1.84.                                                     
 mt=107                                                           
    The covariances were obtained by using kalman.  A chi-value   
    was 1.84.                                                     
                                                                  
mf=34   Covariances of angular distributions (ref.30)             
 mt=2                                                             
    The covariances of p1 coefficients were obtained by using     
    kalman.  a chi-value was 1.4                                  
                                                                  
                                                                  
References                                                        
 1) Chiba S. et al.: JAERI-M 92-027, p.35 (1992).                 
 2) Yamamuro N.: JAERI-M 90-006 (1990).                           
 3) ENSDF: Evaluated Nuclear Structure Data File, BNL/NNDC.       
 4) Stiegliz R.G. et al.: Nucl. Phys. A163, 592 (1971).           
 5) Beer H. and Spencer R.P.: KfK-2063 (1974), also Nucl. Phys.   
    A240, 29 (1975).                                              
 6) Allen B.J. and Musgrove A.R.de L.: Neutron Data of Structural 
    Materials for FBR, 1977 Geel meeting, p.447, Pergamon Press   
    (1979).                                                       
 7) Kenny M.J. et al.: AAEC/E-400 (1977).                         
 8) Agrawal H.M. et al.: Phys. Rev. C30, 1880 (1984).             
 9) Brusegan A. et al.: 85 Santa Fe Vol.1 p.633 (1986).           
10) Mughabghab S.F. et al.: "Neutron Cross Sections", Vol.1,      
    Part A (1981).                                                
11) Igarasi S. and Fukafori T.: JAERI 1321 (1991).                
12) Kunz P.D.: unpublished.                                       
13) Wenusch R. et al.: OSA 99, 1 (1962).                          
14) Molla N.T. et al.: INDC(BAN)-002,1 (1983).                    
15) Ribansky I. et al.: ANE 12, 577 (1985).                       
16) Qaim S.M.: Nucl. Phys. A185, 614 (1972).                      
17) Sailer K. et al.: 1977 Kiev Conf. Vol.1, 246 (1977).          
18) Ikeda Y. et al.: JAERI-1312 (1988).                           
19) Liskien H. et al.: EXFOR data (1989).                         
20) Wagner M. et al. : ANE 16,623 (1989).                         
21) Young P.G. and Arthur E.D.: LA-6947 (1977).                   
22) Forrest R.A.: AERE-R-12419 (1986).                            
23) Grimes S.M. et al.: Phys. Rev. C19, 2127 (1979).              
24) Dolja G.D. et al.: 1973 Kiev Conf. Vol.3, 131 (1973).         
25) Hida K.: JAERI-M 86-150 (1986) (in Japanese).                 
26) Kalbach C. : Phys. Rev. C37, 2350(1988).                      
27) Igashira M. et al.: Private communication (1999) .            
28) Young P.G. et al. : LA-12343-MS (1992).                       
29) Koning A.J. and Delaroche J.P. : ECN-RX-98-015 (1998).        
30) Shibata K. and Oh S.Y.: JAERI-Research 2000-007 (2000).       
31) Asami T.: Private communication (2002).