Fission Product Yield Data for the Transmutation of Minor Actinide ...

4.2.2.5. Principal peak curves
The pair of principal peak curves is the main
contributor to the mass distribution for both high
and low energy fission. Equations for s 1,5 and D 1,5
were derived that represent both low and high
energy fission reactions. The equations are
dependent on both Z F and PE, as shown in
Table 4.2.1, Eq. (4.2.3), while the energy
dependences are shown in Figs 4.2.11 and 4.2.12.
The intensities of these curves (Y 1,5 ) were adjusted
(normalized) so that the sum of intensities of all
curves was 200%.
4.2.2.6. Inner peak curves
The yield of the pair of inner peak curves
(Y 2,4) decreases with PE and goes to zero when PE
is approximately >20 MeV, as shown in Fig. 4.2.14.
Those inner peak curves are narrow, as shown in
Fig. 4.2.15, and represent the sharp change in yields
that occurs below the heavy mass number (A H =
130) and above the light complement (these curves
replace the exponential functions used previously
[4.2.4]).
Mass numbers (A 4 ) at the maxima of the
heavy inner peak curves were determined, and a
function (Eq. (4.2.3), Table 4.2.1) was fitted to the
values by the least squares method. The resulting
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FIG. 4.2.13. Y¢ 3 function, Y¢ 3 = Y 3 – f(A f ). FIG. 4.2.14. Y¢ 2.4 – f(Z p ) function.
FIG. 4.2.15. Average s¢ 2,4 = 2.45 ± 0.05.
parameter values for the function are given in Table
4.2.1. The displacements (D 2 and D 4 ) were then
calculated from the function using Eq. (4.2.5) in the
footnotes to Table 4.2.1. Figure 4.2.16 shows the