In-situ low-energy background measurement in D2O+salt phase of the Sudbury Neutrino Observatory, using the isotropy of ß-? Cerenkov light
Bibliographic record
Abstract
In the second phase of the Sudbury Neutrino Observatory (SNO), salt was added to the D2O, increasing the sensitivity to measurement of the 8B solar neutrino flux through the neutral current reaction, in which the deuteron is split into its proton and its neutron. This reaction is detected by looking for the Cerenkov light which is produced when the neutron is captured on the salt or on the D2O. In this article, I will describe the in-situ method used for the determination of the neutron background from radioactivity within the D2O, as presented in [SNO Collaboration, ArXiv:nucl-ex/0309004, submitted to Phys. Rev. Lett.] (see also R.G.H. Robertson's contribution to this conference). This background is, when combined with ex-situ methods, found to be 0.72 +0.24 -0.23 neutrons per day.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".