<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 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 | 0.008 | 0.005 |
| Meta-epidemiology (narrow) | 0.006 | 0.009 |
| Meta-epidemiology (broad) | 0.003 | 0.010 |
| Bibliometrics | 0.002 | 0.006 |
| Science and technology studies | 0.008 | 0.008 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.011 | 0.013 |
| Research integrity | 0.007 | 0.010 |
| Insufficient payload (model declined to judge) | 0.022 | 0.017 |
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".