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Use NUBASE2020 for half-life data #22

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0f56445
Use NUBASE2020 for half-life data
Dec 23, 2025
9e1d831
update changelog to include recent b_c updates
Feb 27, 2026
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20 changes: 17 additions & 3 deletions activation/index.html
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Expand Up @@ -1031,6 +1031,7 @@ <h3>Thermal flux</h3>
handbook (<a class="cite" href="#ref_IAEA">IAEA 1987</a>), and the
scattering calculator uses the IUPAC 2021 atomic weights and isotope composition
database (<a class="cite" href="#ref_CIAAW">CIAAW 2021</a>).
Half-life values come from NUBASE2020 (<a class="cite" href="#ref_Kondev2021">Kondev 2021</a>).
</p>
<p>
For very high fluences, e.g., more than 10<sup>16</sup> n/cm2, the activation
Expand Down Expand Up @@ -1392,21 +1393,34 @@ <h3>References</h3>
Williams & Wilkins, Baltimore.
[<a href="https://github.com/python-periodictable/periodictable/blob/master/periodictable/activation.dat">activation data</a>]
</li>
<li id="ref_Kondev2021">
Kondev, F.G.; Wang, M.; Huang, W.J.; Naimi, S. and Audi, G. (2021).
<em>The NUBASE2020 evaluation of nuclear physics properties.</em>
Chin. Phys. C45, 030001.
doi:10.1088/1674-1137/abddae
[<a href="https://www.anl.gov/phy/reference/nubase-2020-nubase4mas20">half-life data</a>]
</li>
</ol>
</div>

<div id="help_history" class="help">
<h3>History</h3>
<dl class="inline">
<dt>2026-02-27 v2.2.0</dt>
<dd>Use half-life from NUBASE2020. The following isomers change by 20% or more:
32Si 38Clm 41Ca 79Se 97Tc 108Ag 121Snm 126Sn 135Cs 157Tb 177Lum
<br />Update neutron cross sections for
13C Li 6Li 7Li 141Pr Nd 142-146,148,150Nd 144,147-150,152,154Sm 153Eu 174Yb
</dd>
<dt>2025-04-23 v2.0.0</dt>
<dd>Fix sort by half-life with units of ky, My, Gy.</dd>
<dt>2025-02-28 v2.0.0</dt>
<dd>Use standard year as 365 rather than 365.2425 days when reporting decay time.
</dd>
<dt>2024-12-03 v2.0.0</dt><dd>Update mass and abundance tables, and physical constant values
<br />neutron cross section updates for H, He, C, O, Zn, Kr, Sn, Xe, Sm, Eu, Ir, Pb, Bi
<br />X-ray cross section updates for Pt, Cr, Nb, Y, Er
<br />208Pb activation scaled by 0.001 (value was reported in mbarns but added as barns)
<br />Update neutron cross section for H, He, C, O, Zn, Kr, Sn, Xe, Sm, Eu, Ir, Pb, Bi
<br />Update X-ray cross section for Pt, Cr, Nb, Y, Er
<br />Update activation for 208Pb (reference value is in mbarns instead of barns)
</dd>
<dt>2024-03-22 v1.7.0</dt><dd>Mixture formulas allow wt% and vol%.
<br />Formulas allow unicode subscripts such as H₂O.
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