Measuring transitional matrix elements using first-order perturbation theory in Coulomb excitation
Bibliographic record
Abstract
The low-energy structure of the stable light nucleus 20 Ne has been examined using Coulomb excitation at the TRIUMF ISAC-II Facility in Vancouver, Canada.The highly-efficient and segmented TIGRESS HPGe gamma-ray array has permitted an accurate Coulomb-excitation study of the first excited-state state, 2 + 1 , at 1.634 MeV in 20 Ne.Beams of 20 Ne 5 + with approximately 1.7 × 10 7 ions/s were accelerated to 3.235 MeV/u and bombarded onto a 1.56 mg/cm 2 110 Pd target.Six TIGRESS HPGe clover detectors covering approximately 19% of 4πwere used to detect the gamma rays emitted in the de-excitation of the levels populated in the beam and target nuclei, while scattered ions were detected using annular double-sided, CD-type silicon detector.The angular coverage of the silicon detector at forward angles allows for a clean measurement of transitional matrix elements without second-order effects arising from the static quadrupole moment.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".