Observation of<i>γ</i>vibrations and alignments built on non-ground-state configurations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">Dy</mml:mi><mml:mprescripts/><mml:none/><mml:mn>156</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>
Bibliographic record
Abstract
The exact nature of the lowest ${K}^{\ensuremath{\pi}}={2}^{+}$ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the \ensuremath{\gamma} degree of freedom perpendicular to the nuclear symmetry axis. Very few such \ensuremath{\gamma} bands have been traced past the usual backbending rotational alignments of high-$j$ nucleons. We have investigated the structure of positive-parity bands in the $N=90$ nucleus $^{156}\mathrm{Dy}$, using the $^{148}\mathrm{Nd}(^{12}\mathrm{C},4n)\phantom{\rule{0.28em}{0ex}}^{156}\mathrm{Dy}$ reaction at 65 MeV, observing the resulting \ensuremath{\gamma}-ray transitions with the Gammasphere array. The even- and odd-spin members of the ${K}^{\ensuremath{\pi}}={2}^{+}$\ensuremath{\gamma} band are observed up to ${32}^{+}$ and ${31}^{+}$, respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible \ensuremath{\gamma} vibration built on the aligned yrast $S$ band are observed up to spins ${28}^{+}$ and ${27}^{+}$. An even-spin positive-parity band, observed up to spin ${24}^{+}$, is a candidate for an aligned $S$ band built on the seniority-zero configuration of the ${0}_{2}^{+}$ state at 676 keV. The crossing of this band with the ${0}_{2}^{+}$ band is at $\ensuremath{\hbar}{\ensuremath{\omega}}_{c}=0.28(1)\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$ and is consistent with the configuration of the ${0}_{2}^{+}$ band not producing any blocking of the monopole pairing.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".