Evidence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ξ</mml:mi></mml:math>hypernuclear production in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mo>,</mml:mo><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msubsup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi>Ξ</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:math>reaction
Bibliographic record
Abstract
The E885 Collaboration utilized the $1.8 \mathrm{GeV}{/cK}^{\ensuremath{-}}$ beam line at the Alternating Gradient Synchrotron (AGS) to accumulate greater than 10 times the world's existing data sample of ${(K}^{\ensuremath{-}}{,K}^{+})$ events on carbon. A total of about $3\ifmmode\times\else\texttimes\fi{}{10}^{5} {(K}^{\ensuremath{-}}{,K}^{+})$ events were collected and analyzed. $\ensuremath{\Xi}$ hypernuclear states are expected to be produced through the reaction ${K}^{\ensuremath{-}}{+}^{12}\stackrel{\ensuremath{\rightarrow}}{C}{K}^{+}{+}_{\ensuremath{\Xi}}^{12}\mathrm{Be}.$ A signal could also result from direct production of ${}_{\ensuremath{\Lambda}}^{11}\mathrm{Be}+\ensuremath{\Lambda}$ without a distinct $\ensuremath{\Xi}$ intermediate state. The measured missing-mass spectrum indicates the existence of a signal below the threshold for free ${\ensuremath{\Xi}}^{\ensuremath{-}}$ production that cannot be explained by background or effects of limited resolution. Although the resolution was not sufficient to resolve discrete hypernuclear states, the excess of events in the region of missing mass, kinematically inaccessible in free ${\ensuremath{\Xi}}^{\ensuremath{-}}$ production, can be compared with theoretical predictions for ${}_{\ensuremath{\Xi}}^{12}\mathrm{Be}$ production. Reasonable agreement between the data and theory is achieved by assuming a $\ensuremath{\Xi}$-nucleus potential well depth ${\mathrm{V}}_{0\ensuremath{\Xi}}$ of about 14 MeV within the Woods-Saxon prescription.
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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 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.077 | 0.029 |
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".