Trinity Term, 2008An Improved Measurement of the 8 B Solar Neutrino Energy Spectrum at the Sudbury Neutrino Observatory
Bibliographic record
Abstract
The Sudbury Neutrino Observatory (SNO) has successfully demonstrated the phenomenon of neutrino flavour transformation in the flux of neutrinos from the Sun. Its unique use of heavy water as a detection medium allowed a measurement of both the total active solar neutrino flux, via the Neutral Current (NC) interaction, and the pure electron neutrino component via the Charged Current (CC) interaction. This thesis presents the most detailed analysis of the CC spectrum using the combined data from the first two phases of the experiment: the pure D2O and the salt phases. The neutrino fluxes and spectra have been extracted down to an effective electron kinetic energy threshold of 3.5 MeV, lower than that achieved by any previous water Čerenkov experiment. The significant improvements made in the evaluation of the systematic uncertainties result in the most precise measurement of the total active solar neutrino flux ever reported: Φ uncon
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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 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.053 | 0.022 |
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".