Skip to content

Update branching percentages in CNO bicycle figure after #14 and #20 land #21

Description

@ajsteinmetz

CNO_Bicycle_Loop.pdf (Fig. 12, \label{fig:CNO_Bicycle}) has the branching percentages baked into the artwork. They are the only text in the figure, and there are exactly four labels:

99.94%     0.06%      <- the 15N branch point
64.39%    35.61%      <- the 17O branch point

Both pairs were computed from the NACRE-I rates, so both are invalidated by the two open issues on the surrounding text. The figure currently disagrees with the manuscript body it illustrates.

What changes

${}^{17}$O branch — from #14 (already applied to the text). ETR25 median rates at $T_9 = 0.015$ give $R_{17} = 0.5429$ and $f_{p\gamma} = 0.35187$:

figure now should be
$(p,\gamma){}^{18}$F, into CNO-III 35.61% 35.19%
$(p,\alpha){}^{14}$N, back to CNO-I 64.39% 64.81%

${}^{15}$N branch — pending #20. The figure's 99.94% / 0.06% comes from the NACRE-I ratio $5.9\times10^{-4}$. If the factor-2 LUNA revision discussed in #20 holds at solar core temperature, this becomes roughly 99.97% / 0.03%. These numbers should not be touched until #20 settles what the ratio actually is.

Precision is overstated

Independent of which evaluation is used, quoting four significant figures is not defensible. The ETR25 factor uncertainty on ${}^{17}\mathrm O(p,\alpha){}^{14}\mathrm N$ at $T_9 = 0.015$ is $\approx 1.7$ — the rate itself is uncertain at the tens-of-percent level, so "35.61%" claims precision the input does not support. Consider dropping to whole percentages (35% / 65%, >99.9% / <0.1%) to match how the body text now reads after #14.

Editing route

The percentage labels will be edited by hand in art/CNO_Bicycle_Loop.svg, then re-exported to CNO_Bicycle_Loop.pdf at the repo root, which is what the manuscript includes.

This is a clean edit: all four percentages are live <text> nodes in the SVG, each appearing exactly once, so they can be changed directly without touching the diagram geometry.

Note that art/CNO_Bicycle.svg is a separate, number-free version of the diagram and needs no changes.

Depends on

Activity

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    editorialWording, framing, units, or numerical-value correction

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions