Laser-assisted decay spectroscopy for the ground states of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Au</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>180</mml:mn><mml:mo>,</mml:mo><mml:mn>182</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
A study of the ground states of the laser-ionized and mass-separated odd-odd isotopes $^{180,182}\mathrm{Au}$ was performed using the Resonance Ionization Laser Ion Source, Windmill detection setup and ISOLTRAP Multi-Reflection Time-of-Flight Mass Spectrometer at ISOLDE, CERN. A complex fine-structure $\ensuremath{\alpha}$-decay pattern of $^{180}\mathrm{Au}$ was deduced, providing insight into the low-lying levels in the daughter nucleus $^{176}\mathrm{Ir}$. An $\ensuremath{\alpha}$-decay branching ratio of ${b}_{\ensuremath{\alpha}}(^{180}\mathrm{Au})=0.58(10)%$ and a half-life of ${T}_{1/2}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}7.2(5)$ s have also been derived, allowing for the calculation of the reduced $\ensuremath{\alpha}$-decay widths and determining the degree of hindrance of respective $\ensuremath{\alpha}$-decay branches. From complementary first in-source laser spectroscopy measurements of the hyperfine structure in atomic transitions of $^{180,182}\mathrm{Au}$, the nuclear magnetic moments of $\ensuremath{\mu}(^{180}\mathrm{Au})=\ensuremath{-}0.83(9)\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{N}$ and $\ensuremath{\mu}(^{182}\mathrm{Au})=1.66(9)\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{N}$ were extracted with an inclusion of a correction for the hyperfine anomaly. Based on the observed hyperfine structure patterns, and on the comparison of the measured and calculated $\ensuremath{\mu}$ values, a preferred ground-state spin and parity ${I}^{\ensuremath{\pi}}(^{180}\mathrm{Au}^{\mathrm{gs}})=({1}^{+})$ is proposed, and the earlier assignment of ${I}^{\ensuremath{\pi}}(^{182}\mathrm{Au}^{\mathrm{gs}})=({2}^{+})$ is confirmed. For $^{180}\mathrm{Au}$, the most probable proton-neutron Nilsson configuration of $\ensuremath{\pi}3/{2}^{\ensuremath{-}}[532]\ensuremath{\bigotimes}\ensuremath{\nu}5/{2}^{\ensuremath{-}}[512]$ suggests the same proton state as in the heavier deformed odd-odd nuclei $^{182,184}\mathrm{Au}$.
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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 | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
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".