The TRIUMF Annular Chamber of Tracking and Identification of Charged Particles (TACTIC)
Bibliographic record
Abstract
Many nuclear reactions important for nucleosynthesis are investigated by transfer reactions using a radioactive ion beam on gas targets such as 1 H, 2 H, 3 He and 4 He.Since these measurements are performed in inverse kinematics, the energies of the ejectiles are usually low with a strong angular dependence in the laboratory system.Therefore, a new kind of detector is needed that allows the detection of low-energy ions from a gas target with good energy and angle resolution and a large angular coverage.TACTIC is a cylindrical time-projection chamber that can utilize the target gas also as the drift medium so that no separation window is required.Moreover, the reaction region is still separated from the drift region which allows for the higher beam currents needed for impact energies far below the Coulomb barrier.The cylindrical design is possible by the application of gas electron-multiplier (GEM) foils for the amplification of the weak electrondrift signals.From the electron-drift times the ion track can be reconstructed while the collected charge provides additional information about the ion species.
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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) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.002 |
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".