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The method
➢
We can truncate the expansion of μ
s
up to N
(N=3 is adequate for
192
Ir anisotropic scattering)
Note that truncation pertains to the detail in the description
of scatter cross section in terms of the scattering angle
and that we have NOT discretized in direction
)ˆ ˆ( )ˆ ˆ(
1
1
)ˆ ˆ,
,(
2/1 )
,( ,
), ˆ
ˆ( )
,( ,
3
0 4
1 2
)
ˆ ˆ,
,(
−
→
=→
→
=
=
+
= →
d
nP
E Ers
E Erns
nPE Erns
N
n
n
E Ers