Cluster decays of 12Be excited states
Bibliographic record
Abstract
An experimental study of the helium-cluster decays of the 12 Be excited states has been performed using the 9 Li + 7 Li → α + α + 8 He and 9 Li + 7 Li → α + 6 He + 6 He reactions at the 9 Li beam energy of 74.8 MeV. At excitation energies between 10 and 25 MeV, the 12 Be excited states decaying into the 4 He + 8 He, 6 He + 6 He, and 6 He + 6 He*(1.8 MeV, J π = 2 + ) have been observed. Most of the observed states decaying into the 4 He + 8 He and 6 He + 6 He correspond to previously reported states. The decay to the 6 He + 6 He*(1.8 MeV, J π = 2 + ) channel has been observed for the first time. Two of the five states observed in this new decay channel are also observed in the ground state channel 6 He + 6 He, while two may correspond to the 4 He + 8 He decaying states. The states around 13.5 and 20.0 MeV decay to the 6 He + 6 He and 4 He + 8 He channels, while the state around 22.3 MeV decays into all three decay channels examined. This experiment is complementary to all previous studies of the 12 Be cluster states because of the different reaction mechanisms used for the population of the 12 Be cluster states. The observation of the states at high excitations with these exotic decay properties strongly supports the molecular structure of the 12 Be excited states.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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".