The 16N calibration source for SNO
Bibliographic record
Abstract
The N Calibration Source for SNO b (I M . R. D r a g o w s k y A . Hamer Y . D. C h a n , R. Deal . D. E a r l e , W . Frati °. E . Gaudette , A . Hallin°. C. Hearns , J. Hewett ' , G . Jonkmans ' , Y . K a j i y a m a , A . B . McDonald , B . A . Moffat , E . B . N o r m a n , B . S u r , N . Taggg' d d f 2 d c b b d a b Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA c d Oregon State University, Corvallis, OR 97331, USA Queen's University, Kingston, ON K7L 3N6, Canada Atomic Energy of Canada Limited, Chalk River, ON KOJ 1J0, Canada e University of Pennsylvania, Philadelphia, PA 19104-6396, USA f Laurentian University, Sudbury, ON P3E 2C6, Canada g University of Guelph, Guelph, ON NIG 2W1, Canada A calibration source using 7-rays from N (tx/2 = 7.13 s) /3-decay lias been developed for the Sudbury Neutrino Observatory (SNO) for the purpose of energy and other calibrations. The N is pro- duced via the (n,p) reaction on 0 in the form of CO2 gas us- ing 14-MeV neutrons from a commercially available Deuterium- Tritium (DT) generator. The N is produced in a shielding pit in a utility room near the S N O cavity and transferred to the water volumes (D2O or H2O) in a CO2 gas stream via small diameter capillary tubing. The bulk of the activity decays in a decay/trigger chamber designed to block the energetic /3-particles yet permit the primary branch 6.13 M e V 7-rays to exit. Detection of the coinci- dent /3-particles with plastic scintillator lining the walls of the decay chamber volume provides a tag for the S N O electronics. This paper gives details of the production, transfer, and triggering systems for this source along with a discussion of the source 7-ray output and performance. Los Alamos National Laboratory, Los Alamos, N M 87545, U S A Department of Physics and Astronomy, University of Western Ontario, London, O N N6A 3K7, Canada Institut de Physique, Universite de Neuchâtel, Neuchâtel, CH-2000, Switzerland Nuclear and Astrophysics Laboratory, Oxford University, Keble Road, Oxford, Preprint submitted to Elsevier Preprint 17 June 2001
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".