Isomeric states, high- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>K</mml:mi> </mml:math> bands, and possible prolate-oblate shape coexistence in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Cs</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>116</mml:mn> </mml:mmultiscripts> </mml:math>
Bibliographic record
Abstract
Two new low-lying isomeric states and two new rotational bands have been identified in the odd-odd nucleus $^{116}\mathrm{Cs}$ from a high-statistics experiment using the $^{58}\mathrm{Ni}(^{64}\mathrm{Zn},\ensuremath{\alpha}pn$)$^{116}\mathrm{Cs}$ fusion-evaporation reaction and the JUROGAM $3+\mathrm{MARA}$ setup. The spin-parity of the known ${T}_{1/2}=3.85\phantom{\rule{0.16em}{0ex}}\mathrm{s}$ isomer is firmly fixed as ${6}^{+}$, and its configuration is established as $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}1}\ensuremath{\bigotimes}\ensuremath{\nu}{g}_{7/2}$ from the properties of the strongly coupled band built on it. The ${8}^{+}$ and ${7}^{\ensuremath{-}}$ bandheads of the two rotational bands to which we assign $\ensuremath{\pi}{h}_{11/2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}$ and $\ensuremath{\pi}{h}_{11/2}\ensuremath{\bigotimes}\ensuremath{\nu}{d}_{5/2}$ configurations, respectively, have lifetimes of the order of a few nanoseconds and can therefore be considered as isomeric states. Several weak transitions depopulate the ${8}^{+}$ isomer, feeding states that can be based on oblate shapes. The analysis of the alignment properties, combined with the systematics of the doubly-odd cesium nuclei, and the results of extensive particle number conserving cranked shell-model calculations, led to a very good understanding of the bands structures. The spins and parities of two bands of $^{118}\mathrm{Cs}$ with properties similar to the bands built on the ${6}^{+}$ and ${7}^{\ensuremath{-}}$ isomers of $^{116}\mathrm{Cs}$ have been changed to ${7}^{+}$ and ${7}^{\ensuremath{-}}$ and reassigned to the $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}1}\ensuremath{\bigotimes}\ensuremath{\nu}{g}_{7/2}$ and $\ensuremath{\pi}{h}_{11/2}\ensuremath{\bigotimes}\ensuremath{\nu}{d}_{5/2}$ configurations, respectively. The band of $^{118}\mathrm{Cs}$ built on the $\ensuremath{\pi}{h}_{11/2}\ensuremath{\bigotimes}\ensuremath{\nu}{d}_{5/2}$ configuration has been extended to higher spin. The new results enrich the band structure in very light cesium nuclei and unveil the existence of multiple high-$K$ and possible shape isomers built on two-quasiparticle configurations close to the proton drip line.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.024 | 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; 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".