High-Precision Half-Life Measurements for the Superallowed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>β</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Emitter<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>10</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>: Implications for Weak Scalar Currents
Bibliographic record
Abstract
Precision measurements of superallowed Fermi $\ensuremath{\beta}$-decay transitions, particularly for the lightest superallowed emitters $^{10}\mathrm{C}$ and $^{14}\mathrm{O}$, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the $^{10}\mathrm{C}$ half-life is addressed through two high-precision half-life measurements, via $\ensuremath{\gamma}$-ray photopeak and $\ensuremath{\beta}$ counting, that yield consistent results for the $^{10}\mathrm{C}$ half-life of ${T}_{1/2}=19.2969\ifmmode\pm\else\textpm\fi{}0.0074\text{ }\text{ }\mathrm{s}$ and ${T}_{1/2}=19.3009\ifmmode\pm\else\textpm\fi{}0.0017\text{ }\text{ }\mathrm{s}$, respectively. The latter is the most precise superallowed $\ensuremath{\beta}$-decay half-life measurement reported to date and the first to achieve a relative precision below ${10}^{\ensuremath{-}4}$. A fit to the world superallowed $\ensuremath{\beta}$-decay data including the $^{10}\mathrm{C}$ half-life measurements reported here yields ${b}_{F}=\ensuremath{-}0.0018\ifmmode\pm\else\textpm\fi{}0.0021$ (68% C.L.) for the Fierz interference term and ${C}_{S}/{C}_{V}=+0.0009\ifmmode\pm\else\textpm\fi{}0.0011$ for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.
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How this classification was reachedexpand
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 | 0.005 | 0.005 |
| Meta-epidemiology (narrow) | 0.003 | 0.005 |
| Meta-epidemiology (broad) | 0.001 | 0.007 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.005 | 0.005 |
| Scholarly communication | 0.005 | 0.005 |
| Open science | 0.008 | 0.007 |
| Research integrity | 0.004 | 0.005 |
| Insufficient payload (model declined to judge) | 0.417 | 0.007 |
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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".