File 6 - Laboratory Angle-Energy Law (LAW=7)


The continuum energy-angle representation (LAW=1) is good for nuclear model code results and for experimental data that have been converted to Legendre coefficients. However, since experiments normally give spectra at various fixed angles, some evaluators may prefer to enter data sorted according to (E,μ,E'), rather than the LAW=1 ordering (E,E',μ).

The following quantities are defined for LAW=7:

NR,NE,EINT
normal TAB2 parameters for incident energy E;
NRM,NMU,MUINT
normal TAB2 parameters for emission cosine MU; and
NRP,NEP,EPINT
normal TAB1 parameters for secondary energy EP.

The structure of a subsection is: 

   [MAT, 6, MT/ 0.0, 0.0, 0, 0, NR, NE/ EINT] TAB2
   [MAT, 6, MT/ 0.0, E1, 0, 0, NRM, NMU/ MUINT] TAB2
   [MAT, 6, MT/ 0.0, MU1, 0, 0, NRP, NEP/ EPINT/
                EP1, f(E1,EP1,MU1), EP2, f(E1,EP2,MU1), ...
                EPNEP, f(E1,EPNEP,MU1)] TAB1
                ----------------------------
                continue with TAB1 structures for
                the rest of the NMU emission cosines
                ----------------------------
                continue with TAB2/TAB1 structures for
                the rest of the NE incident energies
                ----------------------------
Emission cosine and secondary energy must be given in the laboratory system for LAW=7. Also, both variables must cover the entire angle-energy range open to the emitted particle.


23 January 1998 T-2 Nuclear Information Service ryxm@lanl.gov