1-H -  3 LANL       EVAL-NOV01 G.M.Hale                         
                      DIST-DEC21                       20211105   
----JENDL-5           MATERIAL  131                               
-----INCIDENT NEUTRON DATA                                        
------ENDF-6 FORMAT                                               
                                                                  
History                                                           
21-11 JENDL-5b3 revised by N.Iwamoto                              
      Data taken from ENDF/B-VIII.0.                              
21-11 revised by O.Iwamoto                                        
      (MF8/MT16) added                                            
                                                                  
*** (n,2n) replaced by ENDF/B-VI.8, total adjusted (NNDC/2010/06 *
n-t scattering evaluation, based on an R-matrix analysis of p-3He 
scattering that was transformed from the 4Li system to the 4H     
system by moving all the eigenenergies downward by a Coulomb      
energy shift of 0.86 MeV.  The calculated neutron total cross     
section then agreed well with new measurements [1] by Phillips et 
al, and the coherent scattering length with a new measurement [2] 
from Rauch, as was described in ref. [3].  The parameters of the  
fit have been used to calculate total cross sections and elastic  
cross sections and angular distributions in the energy range from 
10^(-5) eV to 20 MeV.  Some allowance was made for the (n,2n)     
breakup cross section at energies above 8.4 MeV, so that the total
cross section exceeds the elastic cross section in that energy    
region.                                                           
***************************************************************** 
         MF=1                                                     
               MT=451      Nuclear mass = 3.01550116              
                                                                  
                                                                  
                                                                  
         MF=2                                                     
                                                                  
               MT=151      Scattering length=0.36399 X 10^(-12) cm
                                                                  
         MF=3                                                     
               MT=1        Total cross sections: calculated from  
                           R-matrix parameters after adjusting the
                           Coulomb energy shift to agree with the 
                           measurements of ref [1], which disagree
                           significantly with earlier data [4] at 
                           low energies.                          
                                                                  
               MT=2.       Elastic scattering cross sections:     
                           calculated from the n-t R-matrix       
                           parameters described above.  Identical 
                           with MT=1 at energies below 8.4 MeV.   
                                                                  
               MT=16       (n,2n) cross sections:  non-zero cross 
                           section obtained from allowing two-body
                           nn-d and nn-d0 absorption channels to  
                           couple to the n-t states.  This method 
                           probably underestimates the amount of  
                           (n,2n) cross section at energies above 
                           8.4 MeV.                               
         NOT GIVEN IN MF=3:                                       
                                                                  
               MT=17       (n,3n) cross section:  no data given   
                           since estimates from isospin con-      
                           siderations give essentially zero      
                           probabilities.                         
                                                                  
               MT=102      radiative capture cross section: The   
                           measured cross section is less than or 
                           equal to 6.7 microbarns at thermal.    
                           Since the Q-value is uncertain, but    
                           either zero or negative, this cross    
                           section assumed zero at all energies.  
                                                                  
         MF=4                                                     
               MT=2        Neutron elastic angular distributions  
                           in the center-of-mass system: given as 
                           Legendre coefficients calculated from  
                           the n-t R-matrix parameters.           
                                                                  
                                                                  
         NOT GIVEN:     MF=12, 13, 14, AND 15                     
 ***************************************************************  
                           Only radiative capture produces gamma  
                           rays.  Since the capture cross section 
                           is assumed zero at all energies, these 
                           files are purposely left empty.        
                                                                  
                                                                  
                                 REFERENCES                       
                                                                  
[1] T.W. Phillips, B.L. Berman and J.D. Seagrave, Phys. Rev. C 22,
    384 (1980).                                                   
[2] H. Rauch, D. Tuppinger, H. Wolwitsch and T. Wroblewski, Phys. 
    Lett. 165B, 39 (1985).                                        
[3] G.M. Hale, D.C. Dodder, J.D. Seagrave, B.L. Berman and T.W.   
    Phillips, Phys. Rev. C 42, 438 (1990).                        
[4] Los Alamos Physics and Cryogenics Group, Nucl. Phys. 12, 291  
    (1959).