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 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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.004 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.004 | 0.004 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.030 | 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".