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 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 | 0.003 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.003 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.004 | 0.005 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.001 | 0.005 |
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".