Elucidation of the Anomalous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>9</mml:mn></mml:math>Isospin Quartet Behavior
Why this work is in the frame
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Bibliographic record
Abstract
Recent high-precision mass measurements of $^{9}\mathrm{Li}$ and $^{9}\mathrm{Be}$, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two $A=9$ quartets. The presence of a cubic $d=6.3(17)\text{ }\text{ }\mathrm{keV}$ term for the ${J}^{\ensuremath{\pi}}=3/{2}^{\ensuremath{-}}$ quartet and the vanishing cubic term for the excited ${J}^{\ensuremath{\pi}}=1/{2}^{\ensuremath{-}}$ multiplet depend upon the presence of a nearby $T=1/2$ state in $^{9}\mathrm{B}$ and $^{9}\mathrm{Be}$ that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. $T=1/2$ states have been observed near the calculated energy, above the $T=3/2$ state. However, an experimental confirmation of their ${J}^{\ensuremath{\pi}}$ is needed.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it