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UCRL-6252
changes in the relative proportions of fissions proceeding by each of the
two modes.
We can now proceed in the following manner.
Let us refer to the prod-
uct distribution of one fission mode as Type A fission and to that of the other
mode as Type B fission.
We shall consider here only those fission yields
representing total cumulative yields for an entire mass chain.
Suppose the
subscript i refers to some arbitrary mass chain.
Let a,
= fission yield of mass chain i in Type A fission, ©
b,
= fission yield of mass chain iin Type B fission,
y,;
= observed fission yield of mass chain i,
fa = fraction of total fissions resulting in Type A fission,
ip =l- fA = fraction of total fissions resulting in Type B fission.
We can then write for the observed fission yield of i,
y, = fa, tf,b, = f,a, t+ (1-£,)b, .
Hence
.
y,
= f(a, - b,) + b. :
6
y. -b.
=i
i
A
|
(1)
a, -by
Since the choice of mass chain i was arbitrary we can also write for
any other mass chain j,
Therefore
Since as
b.,
as,
and b are all independent of energy,
the above expres-
sion represents a linear relationship between Y; and Y; that can be written
5001902
¥i = S¥, 745.
(2)