Negative nuclide ID's in ENSDF data?

[Paul Wilson]

Hello all, (and especially Cameron Bates)

When accessing some of the decay scheme data that PyNE imports from ENSDF, we find some nuc IDs that are negative.

While the nucname documentation says that "* Negative nuclides have no meaning (yet).", I was wondering if anyone familiar with ENSDF could explain why it would generate negative nuc ID's?

Thanks in advance,

Paul

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Paul P.H. Wilson (he/him/his)
Grainger Professor of Nuclear Engineering
Chair, Department of Engineering Physics
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