Detailed spectroscopy of doubly magic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>132</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The structure of the doubly magic $_{50}^{132}\mathrm{Sn}_{82}$ has been investigated at the ISOLDE facility at CERN, populated both by the ${\ensuremath{\beta}}^{\ensuremath{-}}\phantom{\rule{0.28em}{0ex}}\mathrm{decay}$ of $^{132}\mathrm{In}$ and ${\ensuremath{\beta}}^{\ensuremath{-}}$-delayed neutron emission of $^{133}\mathrm{In}$. The level scheme of $^{132}\mathrm{Sn}$ is greatly expanded with the addition of 68 $\ensuremath{\gamma}$ transitions and 17 levels observed for the first time in the $\ensuremath{\beta}$ decay. The information on the excited structure is completed by new $\ensuremath{\gamma}$ transitions and states populated in the $\ensuremath{\beta}\text{\ensuremath{-}}n$ decay of $^{133}\mathrm{In}$. Improved delayed neutron emission probabilities are obtained both for $^{132}\mathrm{In}$ and $^{133}\mathrm{In}$. Level lifetimes are measured via the advanced time-delayed $\ensuremath{\beta}\ensuremath{\gamma}\ensuremath{\gamma}$(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the $N$ = 82 and $Z$ = 50 shells, leading to positive- and negative-parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of $^{132}\mathrm{Sn}$.
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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) | 0.001 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 0.008 |
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".