Reorientation-effect measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>〈</mml:mo><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup><mml:mo>∥</mml:mo><mml:mover accent="true"><mml:mrow><mml:mi>E</mml:mi><mml:mn>2</mml:mn></mml:mrow><mml:mo></mml:mo></mml:mover><mml:mo>∥</mml:mo><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup><mml:mo>〉</mml:mo></mml:mrow></mml:math>matrix element in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>10</mml:mn></mml:msup></mml:math>Be
Bibliographic record
Abstract
The highly-efficient and segmented TIGRESS $\ensuremath{\gamma}$-ray spectrometer at TRIUMF has been used to perform a reorientation-effect Coulomb-excitation study of the 2${}_{1}^{+}$ state at 3.368 MeV in ${}^{10}$Be. This is the first Coulomb-excitation measurement that enables one to obtain information on diagonal matrix elements for such a high-lying first excited state from $\ensuremath{\gamma}$-ray data. With the availability of accurate lifetime data, a value of $\ensuremath{-}0.110\ifmmode\pm\else\textpm\fi{}0.087$ $e$b is determined for the $\ensuremath{\langle}{2}_{1}^{+}\ensuremath{\parallel}\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{E2}\ensuremath{\parallel}{2}_{1}^{+}\ensuremath{\rangle}$ diagonal matrix element, which assuming the rotor model, leads to a negative spectroscopic quadrupole moment of ${Q}_{{}_{S}}({2}_{1}^{+})=\ensuremath{-}0.083\ifmmode\pm\else\textpm\fi{}0.066$ $e$b. This result is in agreement with both no-core shell-model calculations performed in this work with the CD-Bonn 2000 two-nucleon potential and large shell-model spaces, and Green's function Monte Carlo predictions with two- plus three-nucleon potentials.
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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 | 0.013 | 0.009 |
| Meta-epidemiology (narrow) | 0.008 | 0.013 |
| Meta-epidemiology (broad) | 0.004 | 0.015 |
| Bibliometrics | 0.003 | 0.009 |
| Science and technology studies | 0.010 | 0.010 |
| Scholarly communication | 0.008 | 0.010 |
| Open science | 0.015 | 0.015 |
| Research integrity | 0.010 | 0.013 |
| Insufficient payload (model declined to judge) | 0.128 | 0.014 |
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".