New short-lived isomer in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Xe</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>128</mml:mn> </mml:mmultiscripts> </mml:math>
Bibliographic record
Abstract
A search for short-lived isomers in $^{128}\mathrm{Xe}$ has been conducted using the generalized centroid difference method applied to $\ensuremath{\gamma}$-ray spectra measured with high-purity germanium detectors. A lifetime of 2.8 ($\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.5$) ns has been extracted for the ${6}^{\ensuremath{-}}$ state, and a shorter lifetime, of the order of one nanosecond, has been extracted for the ${5}^{\ensuremath{-}}$ state. This results emphasize the possibility to measure lifetimes of the order of a few nanoseconds using arrays of germanium detectors in fusion-evaporation reactions. The obtained results reveal an unexpected hindrance of the 271-keV, ${6}^{\ensuremath{-}}\phantom{\rule{4pt}{0ex}}\ensuremath{\rightarrow}\phantom{\rule{4pt}{0ex}}{5}^{\ensuremath{-}}$ transition, which points to predominant $1/{2}^{+}[400]\phantom{\rule{4pt}{0ex}}\ensuremath{\bigotimes}\phantom{\rule{4pt}{0ex}}9/{2}^{\ensuremath{-}}[514]$ and $3/{2}^{+}[402]\phantom{\rule{4pt}{0ex}}\ensuremath{\bigotimes}\phantom{\rule{4pt}{0ex}}9/{2}^{\ensuremath{-}}[514]$ Nilsson configurations of the bands built on the ${5}^{\ensuremath{-}}$ and ${6}^{\ensuremath{-}}$ states, respectively. The obtained results are supported by projected shell-model calculations, which nicely reproduce the bands built on the ${K}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$ and ${K}^{\ensuremath{\pi}}={6}^{\ensuremath{-}}$ states, under the assumption of an attenuated monopole pairing strength.
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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) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.007 | 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".