Excitations of the magic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>50</mml:mn></mml:mrow></mml:math> neutron-core revealed in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ga</mml:mi><mml:mprescripts/><mml:none/><mml:mn>81</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The high-spin states of the neutron-rich $^{81}\mathrm{Ga}$, with three valence protons outside a $^{78}\mathrm{Ni}$ core, were measured. The measurement involved prompt $\ensuremath{\gamma}$-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer ($\mathrm{VAMOS}++$) and the advanced gamma tracking array (AGATA). The new $\ensuremath{\gamma}$-ray transitions, observed in coincidence with $^{81}\mathrm{Ga}$ ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in $^{81}\mathrm{Ga}$ are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic $N=50$ neutron core. These results support the doubly magic character of $^{78}\mathrm{Ni}$ and the persistence of the $N=50$ shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic $N=50$ shell gap, only few nucleons away from $^{78}\mathrm{Ni}$.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.004 |
| Meta-epidemiology (broad) | 0.002 | 0.005 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.003 | 0.004 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.006 | 0.006 |
| Research integrity | 0.002 | 0.005 |
| Insufficient payload (model declined to judge) | 0.022 | 0.010 |
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".