High-precision half-life measurements for the superallowed Fermi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>β</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>emitter<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>14</mml:mn></mml:msup></mml:math>O
Why this work is in the frame
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Bibliographic record
Abstract
The half-life of the superallowed Fermi ${\ensuremath{\beta}}^{+}$ emitter ${}^{14}$O has been determined via simultaneous direct $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ counting experiments at TRIUMF's Isotope Separator and Accelerator (ISAC) facility. A $\ensuremath{\gamma}$-ray counting measurement was performed by detecting the 2312.6-keV $\ensuremath{\gamma}$ rays emitted from an excited state of the daughter ${}^{14}$N following the implantation of samples at the center of the 8$\ensuremath{\pi}$ $\ensuremath{\gamma}$-ray spectrometer, a spherical array of 20 high-purity germanium (HPGe) detectors. A simultaneous $\ensuremath{\beta}$ counting experiment was performed using a fast plastic scintillator positioned behind the implantation site with a solid angle coverage of $\ensuremath{\sim}$20$%$. The results, ${T}_{1/2}(\ensuremath{\beta})=70.610\ifmmode\pm\else\textpm\fi{}0.030\phantom{\rule{4.pt}{0ex}}\text{s}$ and ${T}_{1/2}(\ensuremath{\gamma})=70.632\ifmmode\pm\else\textpm\fi{}0.094\phantom{\rule{4.pt}{0ex}}\text{s}$, form a consistent set and, together with eight previous measurements, establish a new average for the ${}^{14}$O half-life of ${T}_{1/2}=70.619\ifmmode\pm\else\textpm\fi{}0.011\phantom{\rule{4.pt}{0ex}}\text{s}$ with a reduced ${\ensuremath{\chi}}^{2}$ of 0.99.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.003 |
| Meta-epidemiology (broad) | 0.001 | 0.005 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.002 | 0.012 |
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