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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.000 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 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".