Measurement of the static scalar polarizability of the 88Sr+ clock transition
Bibliographic record
Abstract
We have reported recently a high-accuracy measurement of the differential static scalar polarizability, Δα0, of the clock transition of88Sr+. In this paper, we review the method used to make this measurement and the results obtained. Δα0is an essential parameter for the control of the systematic shifts in ion optical frequency standards as it determines the blackbody radiation shift coefficient and the scalar Stark shift caused by micromotion. The new experimental value of Δα0reduces the uncertainty of the blackbody radiation shift coefficient by a factor of 24, from 2 × 10-17to 8.3 × 10-19. In addition, Δα0determines the trap rf frequency for optimum cancellation of the positive Stark shift with the negative time-dilation shift. A suppression factor of more than 200 is obtained with the new value of Δα0, resulting in a net micromotion shift fractional uncertainty at the 10-19level.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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".