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 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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.011 | 0.001 |
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".