300 Icode in Interaction of Neutron with a piece of Lead

Hi,
I have simulated the Interaction of a Neutron with a piece of Lead, I have got Icode=300, Due to the activation of Usdraw entry in mgdraw.f subroutine, can anyone help me understand what type of interactions Icode=300 describes?
Thanks

It’s a (whatever) nuclear interaction undergone by a low-energy (<20 MeV) neutron.

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Do you mean neutron capture or elastic scattering? right?

I mean in addition any other kind of reaction channel.

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