Search for rare alpha and double beta decays of Yb isotopes to excited levels of daughter nuclei
Bibliographic record
Abstract
Abstract A search for alpha and double beta decays of ytterbium isotopes was performed with an ultra low-background high purity germanium detector at Gran Sasso Underground Laboratory (Italy). A 194.7 g Yb $$_2$$ 2 (C $$_2$$ 2 O $$_4$$ 4 ) $$_3$$ 3 powder sample was measured for 11.3 days with a total Yb exposure of 1.25 kg $$\times $$ × day. Half-life limits for $$\alpha $$ α -decay modes of $$^{168}\mathrm Yb$$ 168 Y b , $$^{170}\mathrm Yb$$ 170 Y b , $$^{171}\mathrm Yb$$ 171 Y b , $$^{172}\mathrm Yb$$ 172 Y b , $$^{173}\mathrm Yb$$ 173 Y b , $$^{174}\mathrm Yb$$ 174 Y b and $$^{176}\mathrm Yb$$ 176 Y b into the first excited states have been obtained between $$6\times 10^{14}$$ 6 × 10 14 years and $$2\times 10^{16}$$ 2 × 10 16 years. These are the first experimental constraints of these decay modes. Double electron capture of $$^{168}\mathrm Yb$$ 168 Y b and double beta decay of $$^{176}\mathrm Yb$$ 176 Y b into the first excited 2 $$^+$$ + and 0 $$^+$$ + states could be excluded with limits between $$1\times 10^{14}$$ 1 × 10 14 years to $$8\times 10^{16}$$ 8 × 10 16 years. This improves the experimental information on some of the decay modes compared to previous constraints.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".