Precision Branching Ratio Measurement for the Superallowed<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>Ga</mml:mi><mml:mprescripts/><mml:none/><mml:mn>62</mml:mn></mml:mmultiscripts></mml:math>and Isospin-Symmetry-Breaking Corrections in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>≥</mml:mo><mml:mn>62</mml:mn></mml:math>Nuclei
Bibliographic record
Abstract
A high-precision branching ratio measurement for the superallowed ${\ensuremath{\beta}}^{+}$ decay of $^{62}\mathrm{Ga}$ was performed at the Isotope Separator and Accelerator radioactive ion beam facility. Nineteen $\ensuremath{\gamma}$ rays emitted following ${\ensuremath{\beta}}^{+}$ decay of $^{62}\mathrm{Ga}$ were identified, establishing the dominant superallowed branching ratio to be $(99.861\ifmmode\pm\else\textpm\fi{}0.011)%$. Combined with recent half-life and $Q$-value measurements, this branching ratio yields a superallowed $ft$ value of $3075.6\ifmmode\pm\else\textpm\fi{}1.4\text{ }\text{ }\mathrm{s}$ for $^{62}\mathrm{Ga}$ decay. These results demonstrate the feasibility of high-precision superallowed branching ratio measurements in the $A\ensuremath{\ge}62$ mass region and provide the first stringent tests of the large isospin-symmetry-breaking effects predicted for these decays.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.037 | 0.009 |
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".