<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-delayed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mtext>P</mml:mtext><mml:mprescripts/><mml:none/><mml:mn>26</mml:mn></mml:mmultiscripts></mml:math>: Possible evidence of a proton halo
Bibliographic record
Abstract
Background: Measurements of $\ensuremath{\beta}$ decay provide important nuclear structure information that can be used to probe isospin asymmetries and inform nuclear astrophysics studies.Purpose: To measure the $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ decay of $^{26}\text{P}$ and compare the results with previous experimental results and shell-model calculations.Method: A $^{26}\text{P}$ fast beam produced using nuclear fragmentation was implanted into a planar germanium detector. Its $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-ray emission was measured with an array of 16 high-purity germanium detectors. Positrons emitted in the decay were detected in coincidence to reduce the background.Results: The absolute intensities of $^{26}\text{P}\phantom{\rule{4.pt}{0ex}}\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays were determined. A total of six new $\ensuremath{\beta}$-decay branches and 15 new $\ensuremath{\gamma}$-ray lines have been observed for the first time in $^{26}\text{P}\phantom{\rule{4.pt}{0ex}}\ensuremath{\beta}$ decay. A complete $\ensuremath{\beta}$-decay scheme was built for the allowed transitions to bound excited states of $^{26}\text{Si}$. $ft$ values and Gamow-Teller strengths were also determined for these transitions and compared with shell-model calculations and the mirror $\ensuremath{\beta}$ decay of $^{26}\text{Na}$, revealing significant mirror asymmetries.Conclusions: A very good agreement with theoretical predictions based on the USDB shell model is observed. The significant mirror asymmetry observed for the transition to the first excited state $(\ensuremath{\delta}=51(10)%)$ may be evidence for a proton halo in $^{26}\text{P}$.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.320 | 0.226 |
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".