Timescale for equilibration of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>/</mml:mo><mml:mi>Z</mml:mi></mml:mrow></mml:math>gradients in dinuclear systems
Bibliographic record
Abstract
Equilibration of $N/Z$ in binary breakup of an excited and transiently deformed projectile-like fragment (PLF${}^{*}$), produced in peripheral collisions of ${}^{64}\mathrm{Zn}+{}^{27}$Al, ${}^{64}$Zn, ${}^{209}$Bi at $E/A=45$ MeV, is examined. The composition of emitted light fragments ($3\ensuremath{\le}Z\ensuremath{\le}6$) changes with the decay angle of the PLF${}^{*}$. The most neutron-rich fragments observed are associated with a small rotation angle. A clear target dependence is observed with the largest initial $N/Z$ correlated with the heavy, neutron-rich target. Using the rotation angle as a clock, we deduce that $N/Z$ equilibration persists for times as long as 3--4 zs ($1\phantom{\rule{4pt}{0ex}}\mathrm{zs}=1\ifmmode\times\else\texttimes\fi{}\phantom{\rule{0.16em}{0ex}}{10}^{\ensuremath{-}21}$ s $=300$ fm$/c$). The rate of $N/Z$ equilibration is found to depend on the initial neutron gradient within the PLF${}^{*}$.
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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 | 0.000 |
| 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 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.003 |
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".