31-Ga- 69

 31-Ga- 69 KHI        EVAL-MAR94 T.WATANABE                       
                      DIST-MAY10                       20091112   
----JENDL-4.0         MATERIAL 3125                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
HISTORY                                                           
94-3  Newly evaluated.                                            
00-10 JENDL-3.3                                                   
      Compiled by K.Shibata (jaeri)                               
***** Modified parts for JENDL-3.3 ****************************** 
(1,451)             Updated.                                      
(3,251)             Deleted.                                      
(4,2)               Transformation matrix deleted.                
(5,16-91)           Modified.                                     
***************************************************************** 
09-09 The unresolved resonance parameters were obtained for       
      JENDL-4.0.  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 (MLBW formula): below 5.9keV        
      Negative energy level parameters were adjusted to reproduce 
      Koester's data/1/. Evaluation were mainly based on Ohkubo's 
      data/2/ and Mughabghab's compilation/3/.                    
    Unresolved resonance region: 5.9 keV - 1 MeV                  
      The parameters were obtained by fitting to the evaluated    
      total and capture cross sections.  The unresolved resonance 
      parameters should be used only for self-shielding           
      calculation.                                                
                                                                  
    Thermal cross sections and resonance integrals at 300 K       
    ----------------------------------------------------------    
                     0.0253 eV           res. integ. (*)          
                      (barns)              (barns)                
    ----------------------------------------------------------    
     Total           1.0424E+01                                   
     Elastic         8.2231E+00                                   
     n,gamma         2.2011E+00           1.8219E+01              
    ----------------------------------------------------------    
       (*) Integrated from 0.5 eV to 10 MeV.                      
                                                                  
mf=3  Neutron cross sections                                      
  Below 5.9 keV, resonance parameters were given.                 
  Above 5.9 keV, the total, elastic and inelastic scattering, and 
  capture cross sections were calculated with the optical and     
  statistical model code casthy/4/.                               
  Optical model parameters used in casthy calculation were as     
  follows.                                                        
                                                                  
                depth (MeV)       radius(fm)    diffuseness(fm)   
         ----------------------   ------------  ---------------   
     V  = 49.42-0.5867E         , r0 =  5.3033     , a0 =  0.415  
     Ws = 5.381+0.4117E         , rs =  5.3648     , as =  0.456  
     Vso= 8.552                 , rso=  6.4928     , aso=  0.648  
                                                                  
                                                                  
  The level scheme was adopted from ENSDF file/5/.                
           no.      energy(MeV)    spin-parity  beta2/beta3       
           gr.       0.0000         3/2 -                         
            1        0.3187         1/2 -       0.2               
            2        0.5741         5/2 -       0.2               
            3        0.8720         3/2 -       0.2               
            4        1.0285         1/2 -       0.2               
            5        1.1068         5/2 -       0.15              
            6        1.1340         7/2 -       0.15              
            7        1.3366         7/2 -       0.15              
            8        1.4880         7/2 -       0.15              
            9        1.5259         3/2 -       0.15              
           10        1.7237         5/2 -       0.15              
           11        1.7648         9/2 -                         
           12        1.8916         3/2 -                         
           13        1.9242         7/2 -                         
           14        1.9724         9/2 +                         
           15        1.9731         1/2 -                         
           16        2.0076         3/2 -                         
           17        2.0238         5/2 -                         
           18        2.0452         5/2 -                         
           19        2.1980        13/2 -                         
           20        2.2193         1/2 +                         
           21        2.2510         1/2 -                         
           22        2.3195         7/2 +                         
           23        2.3533         5/2 -                         
           24        2.4233        13/2 -                         
           25        2.4287         5/2 -                         
      Levels above 2.43 MeV were assumed to be overlapping.       
                                                                  
  Parameters for the composite level density formula of Gilbert-  
  Cameron were evaluated.                                         
  Spin cut-off parameter C1 was taken as 0.146.                   
                                                                  
                                   Ga- 69      Ga- 70             
                                 --------    --------             
          a (1/MeV)                11.340      11.590             
          spin cut-off param.       8.271       8.442             
          pairing energy (MeV)      1.500       0.0               
          normalization factor    1481.60     1536.20             
          E-joint (MeV)             6.924       4.221             
                                                                  
  The capture cross section was normalized to 60 millibarns at    
  100keV to reproduce Dovbenko's data/6/.                         
  Above 1 MeV, direct/semidirect capture cross section normalized 
  to 0.77mb at 14 MeV were aded to casthy's results/7/.           
                                                                  
  mt=16,22,28,32,33,103,104,105,106,107,111                       
     (n,2n),(n,na),(n,np),(n,nd),(n,nt),(n,p).(n,d),(n,t),        
     (n,he-3),(n,a),(n,2p)                                        
  were evaluated with modified egnash-2/8/ using f2=0.6 and       
  following optical potential                                     
     neutron   :same as used in casthy                            
     proton    :Perey's omp/9/                                    
     deutron   :Lohr-Haeberli's omp/10/                           
     triton    :Becchetti-Greenlees' omp/11/                      
     he-3      :Becchetti-Greenlees' omp                          
     alpha     :Lemos omp/12/                                     
  and normalized to following data.                               
     (n,2n)     886.0    mb     Chatterjee's data/13/             
     (n,na)       2.2    mb     systematics/14/                   
     (n,np)      17.3    mb     systematics                       
     (n,p)       38.0    mb     Qaims data/15,16/                 
     (n,d)        6.87   mb     systematics                       
     (n,t)        0.55   mb     systematics                       
     (n,a)       22.0    mb     av. exp. data/17/                 
                                                                  
                                                                  
mf=4  Angular distributions of secondary neutrons                 
  mt=2,16,22,28,32,51-75,91                                       
  Elastic and inelastic scattering cross section,(n,2n),(n,na),   
  (n,np) and (n,nd)                                               
  Angular distributions were calculated with casthy for ela-      
  stically and inelastically scattered neutrons.                  
  Diect inelastic contributions were evaluated with dwucky/18/,   
  and added to casthy's results.                                  
  Deformation parameters used in the dwucky calculation were      
  evaluated from compilation/19,20/ and ENDSF half life data.     
  as for (n,2n),(n,na),(n,np) and (n,nd),isotropic distribution   
  was assumed.                                                    
                                                                  
mf=5  Energy distributions of secondary neutrons                  
  mt=16,22,28,32,91                                               
  For (n,2n),(n,na),(n,np),(n,nd) and continum inelastic scatter- 
  ing, secondary neutron energy distributions were calculated with
  egnash-2.                                                       
  ****************************************************************
  For JENDL-3.3, distributions at threshold were modified.        
  ****************************************************************
                                                                  
References                                                        
 1)L.Koester et. al.       Z.Phys. A318,347(1984)                 
 2)M.Ohkubo et. al.        JAERI-M 90-213(1990)                   
 3)S.F.Mughabghab et. al., Neutron Cross Section Vol.1 Part A     
                           Academic Press(1981)                   
 4)S.Igarasi,T.Fukahori    JAERI-1321    (1991)                   
 5)Evaluated Nuclear Structural Data File                         
 6)A.G. Dovbenko et al.    AE 26,67(1969)                         
 7)T,Nakagawa              CAPDIR manual                          
 8)N.Yamamuro              JAERI-M 90-006(1991)                   
 9)F.G.Perey               Phys. Rev. 131, 745(1963)              
10)J.M.Lohr,W.Haeberli     Nucl. Phys. A232, 381(1974)            
11)F.D.Becchetti  and      Polarization Phenomena in Nuclear      
     G.W.Greenlees         Reaction   682(1971) Univ. Wisconsin   
12)O.F.Lemos               Orsay Rep.Ser.A No.136(1972)           
13)A.Chatterjee et al.     69 Rookee 2,117(1969)                  
14)R.A.Forrest             AERE-R 12419(1986)                     
15)S.M.Qaim et al          Nucl. Phys. A283,269(1977)             
16)G.P. Vinitskaya et al.  Vinitskaya (1969) acc.no.=40009008     
17)K.Kawade et al          JAERI-M 92-020(1992)                   
18)N.Yamamuro              JAERI-M 88-140(1988)                   
19)S.Raman et.al.          AND 42,1(1989)                         
20)R.H.Spear               AND 42,55(1989)