7-N - 15

  7-N - 15 JAERI      EVAL-DEC88 T.FUKAHORI                       
JAERI-M 89-047        DIST-MAY10                       20100115   
----JENDL-4.0         MATERIAL  728                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
HISTORY                                                           
88-12 Newly evaluated by T.Fukahori (jaeri)/1/                    
94-04 JENDL-3.2                                                   
      Compiled by T.Fukahori and K.Shibata (ndc/jaeri)            
                                                                  
     *****   modified parts for JENDL-3.2   ********************  
      ( 2,151) Omitted except scattering radius                   
      ( 3,  1) Below 5.5 MeV, changed to point-wise cross section 
      ( 3,  2) Below 5.5 MeV, changed to point-wise cross section 
      ( 3,102) Below 5.5 MeV, changed to point-wise cross section 
      (12,102) From energy balance                                
     ***********************************************************  
01-07 Compiled by K.Shibata for JENDL-3.3                         
                                                                  
     *****   modified parts for JENDL-3.3   ********************  
      (1,451)     Updated.                                        
      (3.1)       Re-calculated.                                  
      (3,102)     Revised.                                        
      (3,251)     Deleted.                                        
      (4,2)       Transformation matrix deleted.                  
      (5,16-91)   INT=22                                          
     ***********************************************************  
                                                                  
06-05 Covariances for MF/MT=33/1 and 33/2 were added by K.Shibata.
                                                                  
10-01 Comments and MODn modified for JENDL-4.0.                   
                                                                  
                                                                  
mf=1          General information                                 
  mt=451    Descriptive data and dictionary                       
                                                                  
mf=2          Resonance parameters                                
  mt=151    Only scattering radius is given.                      
                                                                  
  2200 m/sec cross sections and resonance integrals               
                        2200 m/sec        res. integ.             
            total         4.590 b             -                   
            elastic       4.590 b             -                   
            capture       0.024 mb          0.016 mb              
                                                                  
mf=3          Cross sections                                      
  mt=1      Total cross section                                   
        Below 5.5 MeV, resonance parameters of the multi-level    
        Breit-Wigner formula /2,3/ are adjusted to reproduce the  
        experimental data of B.Zeitnitz et al./4/, and given as   
        point-wise data.  Above 5.5 MeV, smooth curve was obtained
        by fitting to the experimental data of B.Zeitnitz et al.  
  mt=2      Elastic scattering cross section                      
        Below 5.5 MeV, point-wise cross section obtained from MLBW
        calculation is given.  Above 5.5 MeV, the cross section   
        was obtained by subtracting the reaction cross sections   
        from the total cross section.                             
  mt=4      Total inelastic scattering cross section              
        Sum of mt=51-66 and 91.                                   
  mt=16,22,28,32,33,103,104,105,107                               
        Calculated with gnash /5/. The optical potential potential
        parameters, the level density parameters and the level    
        scheme are shown in tables 1-3, respectively.             
  mt=51-91  Inelastic scattering                                  
        Calculated with casthy /6/. The parameters are also shown 
        in tables 1-3.                                            
  mt=102    Capture cross section                                 
        Below 5.5 MeV, point-wise cross section obtained from MLBW
        calculation is given.  Above 5.5 MeV, the cross section   
        was obtained by casthy calculation.                       
        For JENDL-3.3, the direct p-wave capture was considered   
        using the formula derived by Meissner et al./11/          
                                                                  
mf=4           Angular distributions of secondary neutrons        
  mt=2,51-66                                                      
        Based on the casthy calculation.                          
  mt=16,22,28,32,33,91                                            
        Assumed to be isotropic in the center of mass system.     
                                                                  
mf=5          Energy distributions of secondary neutrons          
  mt=16,22,28,32,33,91                                            
        Based on the gnash calculation.                           
                                                                  
mf=12-15      Gamma-ray data                                      
        Based on the gnash calculation.  For mf=12,mt=102,        
        modification was done for energy balance.                 
                                                                  
mf=33         Covariances                                         
  mt=1                                                            
        Based on the least-squares fit to the measurements /4,12- 
        16/.                                                      
  mt=2                                                            
        Below 5.5 MeV, the covariance matrix is the same as that  
        for mt1.  Above 5.5 MeV, the covariances were obtained    
        from the Kalman/Eliese-Casthy calculations /17/.          
  The detais are given in Ref.18.                                 
                                                                  
                                                                  
         Table 1   The optical potential parameters               
------------------------------------------------------------------
 neutron  V   = 50.08-0.012E MeV   r0 = 1.22 fm   a0 = 0.66 fm    
          Ws  =  8.91+0.618E MeV   ri = 1.45 fm   ai = 0.13 fm    
          Vsym=  5.50        MeV   r0 = 1.15 fm   a0 = 0.50 fm    
                                                                  
 proton   V   = 51.30-0.220E MeV   r0 = 1.21 fm   a0 = 0.61 fm    
          Ws  =  6.40-0.050E MeV   ri = 1.03 fm   ai = 0.53 fm    
          Vsym=  6.00        MeV   r0 = 1.06 fm   a0 = 0.53 fm    
                                                                  
 deuteron  Perey-Perey's potential/7/                             
                                                                  
 triton    Becchetti-Greenlees's potential/8/                     
                                                                  
 alpha    V   = 43.9         MeV   r0 = 1.91 fm   a0 = 0.45 fm    
          Wv  =  3.85        MeV   ri = 1.91 fm   ai = 0.45 fm    
------------------------------------------------------------------
                                                                  
             Table 2   The level density parameters               
-------------------------------------------------------           
           a(1/MeV)    t(MeV)    pair.(MeV)   Ex(MeV)             
-------------------------------------------------------           
  B-11      1.431       6.149       2.67       25.58              
  B-12      1.491       6.201       0.0        26.78              
  C-12      1.700       5.971       5.60       37.91              
  C-13      1.846       5.382       2.80       30.57              
  C-14      1.988       4.887       5.00       28.94              
  C-15      1.988       4.600       0.0        19.28              
  N-14      1.600       5.000       0.0        10.00              
  N-15      2.130       3.758       2.20       10.07              
  N-16      2.130       4.547       0.0        22.11              
-------------------------------------------------------           
                                                                  
Table 3  The level scheme (energy(MeV), spin and parity)/3,9,10/  
------------------------------------------------------------------
       N-14      N-15      N-16      C-15      C-14     C-13      
------------------------------------------------------------------
 gs  0.0   1+ 0.0   1/2- 0.0   2- 0.0   1/2+ 0.0   0+ 0.0   1/2-  
  1  2.313 0+ 5.270 5/2+ 0.120 0- 0.740 5/2+ 6.094 1- 3.089 1/2+  
  2  3.948 1+ 5.299 1/2+                     6.589 0+ 3.685 3/2-  
  3  4.915 0- 6.324 3/2-                     6.728 3- 3.854 5/2+  
  4  5.106 2- 7.155 5/2+                     6.903 0-             
  5  5.691 1- 7.301 3/2+                     7.012 2+             
  6  5.834 3- 7.567 7/2+                     7.341 2-             
  7  6.204 1+ 8.313 1/2+   ---------------------------------------
  8  6.446 3+ 8.571 3/2+            C-12     B-11       B-12      
  9  7.029 2+ 9.050 1/2+   ---------------------------------------
 10           9.152 3/2-     gs   0.0   0+ 0.0   3/2- 0.0   1+    
 11           9.155 5/2+      1            2.125 1/2- 0.953 2+    
 12           9.225 1/2-      2            4.445 5/2- 1.674 2-    
 13           9.758 5/2-      3            5.020 3/2- 2.620 1-    
 14           9.829 7/2-      4            6.743 7/2- 2.720 0+    
 15           9.928 3/2-      5            6.793 1/2+             
 16          10.070 3/2+      6            7.286 5/2+             
------------------------------------------------------------------
                                                                  
References                                                        
 1) Fukahori T.: JAERI-M 89-047 (1989).                           
 2) Mughabghab S.F. et al. : 'Neutron Cross Sections' Vol.1 Part A
    (Academic Press 1981, New York)                               
 3) Ajzenberg-Selove F.: Nucl. Phys. A460 (1986) 1                
 4) Zeitnitz B. et al.: KfK-1443 (1971)                           
 5) Young P.G. et al.: GNASH, a preequilibrium,statistical        
    nuclear-model code for calculation of cross section and       
    emission spectra, LA-6947 (1977).                             
 6) Igarasi S. and Fukahori T.: JAERI 1321 (1991).                
 7) Perey F.G.: Phys. Rev. 131 (1963) 745                         
 8) Becchetti Jr. F.D. and Greenlees G.W.: 'Polarization Phenomena
    in Nuclear Reactions', the University of Wisconsin Press      
    (1971)                                                        
 9) Ajzenberg-Selove F.: Nucl. Phys. A449 (1986) 1                
10) Ajzenberg-Selove F.: Nucl. Phys. A433 (1985) 1                
11) Meissner J. et al.: Phys. Rev. C53 (1996) 977                 
12) Sikkema C.P.: Nucl. Phys. 32 (1962) 470                       
13) Schellenberg L. et al.: Helevetica Physica Acta, 32 (1959) 357
14) Fossan D.B. et al.: Phys. Rev. 135 (1964) B1347               
15) Fossan D.B. et al.: Phys. Rev. 152 (1966) 980                 
16) Donoghue T.R. et al.: Nucl. Phys. 54 (1964) 49                
17) Kawano T, Shibata K.: JAERI-Data/Code 97-037 (1997) [in       
    Japanese]                                                     
18) Shibata K, Nakagawa T.: J. Nucl. Sci. Technol., 44, 1 (2007).