Radiative neutron capture on a proton at big-bang nucleosynthesis energies
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Bibliographic record
Abstract
The total cross section for radiative neutron capture on a proton, $\mathit{np}\ensuremath{\rightarrow}d\ensuremath{\gamma}$, is evaluated at big-bang nucleosynthesis (BBN) energies. The electromagnetic transition amplitudes are calculated up to next-to-leading-order within the framework of pionless effective field theory with dibaryon fields. We also calculate the $d\ensuremath{\gamma}\ensuremath{\rightarrow}\mathit{np}$ cross section and the photon analyzing power for the $d\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}\ensuremath{\rightarrow}\mathit{np}$ process from the amplitudes. The values of low-energy constants that appear in the amplitudes are estimated by a Markov Chain Monte Carlo analysis using the relevant low-energy experimental data. Our result agrees well with those of other theoretical calculations except for the $\mathit{np}\ensuremath{\rightarrow}d\ensuremath{\gamma}$ cross section at some energies estimated by an $R$-matrix analysis. We also study the uncertainties in our estimation of the $\mathit{np}\ensuremath{\rightarrow}d\ensuremath{\gamma}$ cross section at relevant BBN energies and find that the estimated cross section is reliable to within $~1$% error.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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 | 0.001 |
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 it