<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-delayed neutron decay of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>82</mml:mn></mml:mrow></mml:math> nucleus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>In</mml:mi><mml:mn>82</mml:mn><mml:none/><mml:mprescripts/><mml:mn>49</mml:mn><mml:mn>131</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
The half-lives of three $\ensuremath{\beta}$-decaying states of $_{49}^{131}\mathrm{In}_{82}$ have been measured with the GRIFFIN $\ensuremath{\gamma}$-ray spectrometer at the TRIUMF-ISAC facility to be ${T}_{1/2}(1/{2}^{\ensuremath{-}})=328(15)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, ${T}_{1/2}(9/{2}^{+})=265(8)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, and ${T}_{1/2}(21/{2}^{+})=323(55)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, respectively. The first observation of $\ensuremath{\gamma}$ rays following the $\ensuremath{\beta}n$ decay of $^{131}\mathrm{In}$ into $^{130}\mathrm{Sn}$ is reported. The $\ensuremath{\beta}$-delayed neutron emission probability is determined to be ${P}_{1n}=12(7)%$ for the $21/{2}^{+}$ state and $2.3(3)%$ from the combined $1/{2}^{\ensuremath{-}}$ and $9/{2}^{+}$ states of $_{49}^{131}\mathrm{In}_{82}$ observed in this experiment. A significant expansion of the decay scheme of $^{131}\mathrm{In}$, including 17 new excited states and 35 new $\ensuremath{\gamma}$-ray transitions in $_{50}^{131}\mathrm{Sn}_{81}$ is also reported. This leads to large changes in the deduced $\ensuremath{\beta}$-branching ratios to some of the low-lying states of $^{131}\mathrm{Sn}$ compared to previous work with implications for the strength of the first-forbidden $\ensuremath{\beta}$ transitions in the vicinity of doubly magic $_{50}^{132}\mathrm{Sn}_{82}$.
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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 | 0.004 | 0.009 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.003 |
| Bibliometrics | 0.003 | 0.005 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.011 | 0.008 |
| Open science | 0.005 | 0.004 |
| Research integrity | 0.004 | 0.004 |
| Insufficient payload (model declined to judge) | 0.490 | 0.615 |
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".