Laser and decay spectroscopy of the short-lived isotope <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Fr</mml:mi><mml:mprescripts/><mml:none/><mml:mn>214</mml:mn></mml:mmultiscripts></mml:math> in the vicinity of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>126</mml:mn></mml:mrow></mml:math> shell closure
Bibliographic record
Abstract
Combined decay and laser spectroscopy measurements of the isotope $^{214}\mathrm{Fr}$ are reported, using the collinear resonance ionization spectroscopy (CRIS) technique at the ISOLDE facility at CERN. For the ${I}^{\ensuremath{\pi}}=({1}^{\ensuremath{-}})$ spin assignment, the $g$-factor value of $g(^{214}\mathrm{Fr})=+0.241(16)$ corresponds to a relatively pure $(\ensuremath{\pi}1{h}_{9/2}$ $\ensuremath{\bigotimes}$ $\ensuremath{\nu}2{g}_{9/2})$ ground-state configuration. An alternative interpretation with $g(^{214}\mathrm{Fr})=+0.144(10)$, for a $({2}^{\ensuremath{-}})$ spin assignment suggests a greater contribution of configuration mixing with the $\ensuremath{\nu}1{i}_{11/2}$ orbital. As the $N=126$ shell closure is passed, a kink is observed at the $\ensuremath{\delta}{\ensuremath{\langle}{r}^{2}\ensuremath{\rangle}}^{213,214}$ value, which is analogous to the behavior observed in the neighboring isotopic chains.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.023 | 0.004 |
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".