Recoil ions from the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Sb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>134</mml:mn></mml:mmultiscripts></mml:math> confined in a Paul trap
Bibliographic record
Abstract
The low-energy recoiling ions from the $\ensuremath{\beta}$ decay of $^{134}\mathrm{Sb}$ were studied by using the Beta-decay Paul Trap. Using this apparatus, singly charged ions were suspended in vacuum at the center of a detector array used to detect emitted $\ensuremath{\beta}$ particles, $\ensuremath{\gamma}$ rays, and recoil ions in coincidence. The recoil ions emerge from the trap with negligible scattering, allowing $\ensuremath{\beta}$-decay properties and the charge-state distribution of the daughter ions to be determined from the $\ensuremath{\beta}$-ion coincidences. First-forbidden $\ensuremath{\beta}$-decay theory predicts a $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\nu}$ correlation coefficient of nearly unity for the ${0}^{\ensuremath{-}}$ to ${0}^{+}$ transition from the ground state of $^{134}\mathrm{Sb}$ to the ground state of $^{134}\mathrm{Te}$. Although this transition was expected to have a nearly 100% branching ratio, an additional 17.2(52)% of the $\ensuremath{\beta}$-decay strength must populate high-lying excited states to obtain an angular correlation consistent with unity. The extracted charge-state distribution of the recoiling ions was compared with existing $\ensuremath{\beta}$-decay results and the average charge state was found to be consistent with the results from lighter nuclei.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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".