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 machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.015 | 0.006 |
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; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".