<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay half-lives of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Sb</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>134</mml:mn><mml:mo>,</mml:mo><mml:mn>134</mml:mn><mml:mi>m</mml:mi></mml:mrow></mml:mmultiscripts></mml:math> and their isomeric yield ratio produced by the spontaneous fission of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Cf</mml:mi><mml:mprescripts/><mml:none/><mml:mn>252</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
A number of fission products possess isomeric states which have a nuclear spin significantly different from that of the ground state. The yield ratio of these states following fission is influenced by the angular momentum present in the fissioning system. The $^{134m,134}\mathrm{Sb}$ yield ratio had not been previously measured in the spontaneous fission of $^{252}\mathrm{Cf}$; however, it had previously been observed to favor the (${7}^{\ensuremath{-}}$) isomer over the (${0}^{\ensuremath{-}}$) ground state in $^{235}\mathrm{U}({n}_{th},f$) and $^{232}\mathrm{Th}$(25 MeV $p,f$). Using a mass-separated beam of low-energy $^{134,134m}\mathrm{Sb}$ ions produced by $^{252}\mathrm{Cf}$ spontaneous fission at the CARIBU facility, $\ensuremath{\beta}$ particles and $\ensuremath{\gamma}$ rays were detected using the SATURN/X-Array decay station to determine the fission-yield ratio and $\ensuremath{\beta}$-decay half-lives. The $^{134m}\mathrm{Sb}$ to $^{134}\mathrm{Sb}$ fission yield was determined to be $2.03\ifmmode\pm\else\textpm\fi{}0.05$ and the half-lives of $^{134m}\mathrm{Sb}$ and $^{134}\mathrm{Sb}$ were found to be $9.87\ifmmode\pm\else\textpm\fi{}0.08$ s and $0.674\ifmmode\pm\else\textpm\fi{}0.004$ s, respectively. These results represent the first isomeric yield ratio measurement for this nucleus, and improved measurements of the $^{134}\mathrm{Sb}$ ground state and the $^{134m}\mathrm{Sb}$ isomer half-lives.
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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 | 0.002 | 0.005 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.004 | 0.004 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.315 | 0.309 |
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".