Line-shape analysis of Doppler-broadened<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>lines following the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Li</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The $\ensuremath{\beta}$ decay of $^{11}\mathrm{Li}$ is studied at the TRIUMF Isotope Separation and Acceleration (ISAC) facility using the $8\ensuremath{\pi} \ensuremath{\gamma}$-ray spectrometer coupled with an inner array of $20$ plastic scintillators for $\ensuremath{\beta}$ detection. Doppler-broadened line shapes resulting from the decay of the excited states in $^{10}\mathrm{Be}$ populated by $\ensuremath{\beta}$-delayed one-neutron emission are analyzed using Monte Carlo simulations. New $\ensuremath{\beta}$-delayed neutron decay branches are shown to contribute to the complex decay of $^{11}\mathrm{Li}$. The half-lives of all but one bound excited state in $^{10}\mathrm{Be}$ are also deduced from this work. Among them, the half-life of the ${2}^{\ensuremath{-}}$ state in $^{10}\mathrm{Be}$ is shown to be much shorter than previously thought, yielding a new experimental $B(E1)$ now well within the range of theoretical predictions and providing further evidence that the ${2}^{\ensuremath{-}}$ state in $^{10}\mathrm{Be}$ is an excited halo state. The nature of the $8.82$-MeV state in $^{11}\mathrm{Be}$ and its decay paths to excited states in $^{10}\mathrm{Be}$ are found to be consistent with the $\ensuremath{\beta}$ decay of the core proceeding through this particular state.
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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 | 0.005 | 0.004 |
| Meta-epidemiology (narrow) | 0.003 | 0.005 |
| Meta-epidemiology (broad) | 0.002 | 0.009 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.004 | 0.004 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.007 | 0.007 |
| Research integrity | 0.004 | 0.005 |
| Insufficient payload (model declined to judge) | 0.031 | 0.006 |
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; both teacher heads agree on what is shown here.
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".