Examination of the role of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mrow><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi></mml:mrow><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">F</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>17</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>reaction rate in type-I x-ray bursts
Bibliographic record
Abstract
The $^{14}\mathrm{O}(\ensuremath{\alpha},p)^{17}\mathrm{F}$ reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type-I x-ray bursts (XRBs). The resonant properties in the compound nucleus $^{18}\mathrm{Ne}$ have been investigated through resonant elastic scattering of $^{17}\mathrm{F}+p$. The radioactive $^{17}\mathrm{F}$ beam was separated by the Center for Nuclear Study radioactive ion beam separator (CRIB) and bombarded a thick ${\mathrm{H}}_{2}$ gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by three $\ensuremath{\Delta}E\text{\ensuremath{-}}E$ silicon telescopes at laboratory angles of ${\ensuremath{\theta}}_{\mathrm{lab}}\ensuremath{\approx}3{}^{\ensuremath{\circ}},10{}^{\ensuremath{\circ}}$, and $18{}^{\ensuremath{\circ}}$. Five resonances at ${E}_{x}=6.15$, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions, and their spin-parities have been determined based on an $R$-matrix analysis. In particular, ${J}^{\ensuremath{\pi}}={1}^{\ensuremath{-}}$ was firmly assigned to the 6.15-MeV state which dominates the thermonuclear $^{14}\mathrm{O}(\ensuremath{\alpha},p)^{17}\mathrm{F}$ rate below 2 GK. As well, a possible new excited state in $^{18}\mathrm{Ne}$ was observed at ${E}_{x}=6.85\ifmmode\pm\else\textpm\fi{}0.11$ MeV with tentative $J=0$ assignment. This state could be the analog state of the 6.880 MeV $(0{}^{\ensuremath{-}})$ level in the mirror nucleus $^{18}\mathrm{O}$, or a bandhead state $(0{}^{+})$ of the six-particle four-hole (6p-4h) band. A new thermonuclear $^{14}\mathrm{O}(\ensuremath{\alpha},p)^{17}\mathrm{F}$ rate has been determined, and the astrophysical impact of multiple recent rates has been examined using an XRB model. Contrary to previous expectations, we find only a modest impact on predicted nuclear energy generation rates from using reaction rates differing by up to several orders of magnitude.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.009 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.005 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.059 | 0.021 |
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".