Coulomb excitation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Rn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>222</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The nature of quadrupole and octupole collectivity in $^{222}\mathrm{Rn}$ was investigated by determining the electric-quadrupole ($E2$) and octupole ($E3$) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive $^{222}\mathrm{Rn}$ beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball $\ensuremath{\gamma}$-ray spectrometer following the bombardment of two targets, $^{120}\mathrm{Sn}$ and $^{60}\mathrm{Ni}$. Transition $E2$ matrix elements within the ground-state and octupole bands were measured up to $10\ensuremath{\hbar}$ and the results were consistent with a constant intrinsic electric-quadrupole moment, $518(11)\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{2}$. The values of the intrinsic electric-octupole moment for the ${0}^{+}\ensuremath{\rightarrow}{3}^{\ensuremath{-}}$ and ${2}^{+}\ensuremath{\rightarrow}{5}^{\ensuremath{-}}$ transitions were found to be respectively ${2360}_{\ensuremath{-}210}^{+300}\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{3}$ and ${2300}_{\ensuremath{-}500}^{+300}\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{3}$ while a smaller value, ${1200}_{\ensuremath{-}900}^{+500}\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{3}$, was found for the ${2}^{+}\ensuremath{\rightarrow}{1}^{\ensuremath{-}}$ transition. In addition, four excited non-yrast states were identified in this work via $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences.
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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 | 0.001 |
| 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 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.032 | 0.006 |
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".