The Mass of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">g</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>22</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
Mass measurements with a relative precision of better than $1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ were performed on $^{22}\mathrm{M}\mathrm{g}$ and its reaction partners $^{21}\mathrm{N}\mathrm{a}$ and $^{22}\mathrm{N}\mathrm{a}$ with the ISOLTRAP Penning trap mass spectrometer at CERN, yielding the mass excesses $D(^{22}\mathrm{M}\mathrm{g})=\ensuremath{-}399.92(27)\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$, $D(^{21}\mathrm{N}\mathrm{a})=\ensuremath{-}2184.71(21)\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$, and $D(^{22}\mathrm{N}\mathrm{a})=\ensuremath{-}5181.56(16)\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$. The importance of these results is twofold. First, a comparative half-life ($Ft$ value) has been obtained for the superallowed $\ensuremath{\beta}$ decay of $^{22}\mathrm{M}\mathrm{g}$ to further test the conserved-vector-current hypothesis. Second, the resonance energy for the $^{21}\mathrm{N}\mathrm{a}$ proton capture reaction has been independently determined, allowing direct comparisons of observable $\ensuremath{\gamma}$ radiation in nova explosions with the yield expected from models.
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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 | 0.003 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.002 | 0.005 |
| Insufficient payload (model declined to judge) | 0.108 | 0.056 |
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".