Energy structure of 999-group JEFF-3.0/A

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Perry Young

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Jul 15, 2025, 2:27:31 PMJul 15
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Hello,

Can someone tell me the lower and upper energy bins of the Origen 999 neutron energy group structure.
Specifically, this is the structure that is used with the neutron activation library:
origen.rev01.jeff999g

I've looked high and low but I cannot find information on the 999 group structure.

Thank you,
Perry

Pavlo Ivanusa

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Jul 15, 2025, 2:38:14 PMJul 15
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I think this may a good document for you: https://www.nrc.gov/docs/ML1218/ML12184A002.pdf 

Perry Young

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Jul 16, 2025, 2:54:58 PMJul 16
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Awesome,
thank you Pavlo
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