Absence of Low-Energy Shape Coexistence in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ge</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>80</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>: The Nonobservation of a Proposed Excited <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mn>0</mml:mn><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math> Level at 639 keV
Bibliographic record
Abstract
The $^{80}\mathrm{Ge}$ structure was investigated in a high-statistics $\ensuremath{\beta}$-decay experiment of $^{80}\mathrm{Ga}$ using the GRIFFIN spectrometer at TRIUMF-ISAC through $\ensuremath{\gamma}$, $\ensuremath{\beta}\text{\ensuremath{-}}e$, $e\text{\ensuremath{-}}\ensuremath{\gamma}$, and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ spectroscopy. No evidence was found for the recently reported ${0}_{2}^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}\mathrm{Ge}$. Large-scale shell model calculations performed in $^{78,80,82}\mathrm{Ge}$ place the ${0}_{2}^{+}$ level in $^{80}\mathrm{Ge}$ at 2 MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}\mathrm{Ge}$.
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How this classification was reachedexpand
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 | 0.004 | 0.003 |
| Meta-epidemiology (narrow) | 0.003 | 0.004 |
| Meta-epidemiology (broad) | 0.001 | 0.005 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.003 | 0.005 |
| Scholarly communication | 0.002 | 0.004 |
| Open science | 0.006 | 0.006 |
| Research integrity | 0.003 | 0.005 |
| Insufficient payload (model declined to judge) | 0.068 | 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; both teacher heads agree on what is shown here.
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".