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:
pair production
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Apr29-09, 06:40 PM
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4
Bob S
pair production
Pair production requires BOTH the photon energy exceeding 1.02 MeV, AND something momentum can be transferred to, like a nucleus. The cross section is proportional to Z
2
Ln(
E
) from 3 MeV to over 1 GeV. (
E
=
hv
)