Modes de décroissance des réactions de capture radiative résonnantes des collisions 12C+12C et 12C+16O
Bibliographic record
Abstract
Mon travail contribue a la recherche du lien entre resonances etroites et etats moleculaires dans les systemes 12C+12C et 12C+16O proches de la barriere de Coulomb via le processus de capture radiative. Ce mecanisme permet de sonder a la fois la voie d’entree par son recouvrement avec les etats du noyau composite et la nature des etats alimentes via les transitions electromagnetiques. Les experiences ont ete realisees au laboratoire Triumf (Canada) afin d’utiliser le spectrometre a 0° Dragon et l'ensemble de 30 BGO associes. Les resultats presentent pour la premiere fois le spectre de decroissance complet de la capture radiative et montrent en particulier qu’une branche importante (>50% du flux γ) decroit vers des etats quasi-lies autour de 10-11 MeV. En utilisant le code de transport Geant3 pour decrire l’ensemble de l’appareil de detection, j’ai propose trois scenarii de decroissance : l’un, purement statistique, le deuxieme, resonnant, a spin d’entree unique, et le dernier base sur un modele cluster. J’ai ainsi determine les spins d’entree ainsi que les sections efficaces totales de capture radiative. J’ai egalement effectue des calculs Hartree Fock dependant du temps pour etudier le mecanisme de reaction et determiner le temps de vie dinucleaire de ces reactions. Mon etude se termine par des calculs de simulation GEANT4 etudiant la fonction de reponse du futur multidetecteur PARIS, base sur l’utilisation des nouveaux cristaux scintillants de LaBr3 qui sera installe aupres de Spiral2. Mes resultats montrent que la resolution et l’efficacite de ce futur detecteur permettra de statuer parmi les differents scenarii proposes dans ce travail.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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 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".