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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)
), ˆ ˆ( )
,( ,
3
4
1 2
)ˆ ˆ,
,(
nPE Erns
N n
E Ers
)ˆ ˆ( )ˆ ˆ(
1
1
)ˆ ˆ,
,(
2/1 )
,( ,
0
d
nP
E Ers
E Erns
n
Note that truncation pertains to the detail in the description of scatter cross
i i h i l
di
d h
h NOT di
i d i di
i
sect on n sp er ca coor nates an t at we ave
scret ze n rect on