Internal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>Decay and the Superallowed Branching Ratio for the<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:mmultiscripts><mml:mi mathvariant="normal">K</mml:mi><mml:none/><mml:mi>m</mml:mi><mml:mprescripts/><mml:none/><mml:mn>38</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The branching ratio for the superallowed ${\ensuremath{\beta}}^{+}$ decay of $^{38}\mathrm{K}^{m}$ was measured at TRIUMF's ISAC radioactive ion beam facility. The $M3$ internal transition between the isomer and the ground state of $^{38}\mathrm{K}^{m}$ was observed with a branching ratio of 330(43) ppm. A search for the nonanalogue $\ensuremath{\beta}$-decay branch to the first excited ${0}^{+}$ state in $^{38}\mathrm{Ar}$ was also performed and yielded an upper limit of $\ensuremath{\le}12\text{ }\text{ }\mathrm{ppm}$ at 90% C.L. These measurements lead to a revised superallowed branching ratio for $^{38}\mathrm{K}^{m}$ of 99.967(4)%, and increase the $^{38}\mathrm{K}^{m}$ $ft$ value by its entire quoted uncertainty to $ft=3052.1(10)\text{ }\text{ }\mathrm{s}$. Implications for tests of the nuclear-structure dependent corrections in superallowed $\ensuremath{\beta}$ decays and the extraction of the Cabibbo-Kobayashi-Maskawa matrix element ${V}_{\mathrm{ud}}$ are discussed.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.004 | 0.005 |
| Meta-epidemiology (broad) | 0.002 | 0.007 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.007 | 0.006 |
| Scholarly communication | 0.005 | 0.005 |
| Open science | 0.007 | 0.008 |
| Research integrity | 0.003 | 0.007 |
| Insufficient payload (model declined to judge) | 0.003 | 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; 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".