<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 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 | 0.007 | 0.006 |
| Meta-epidemiology (narrow) | 0.005 | 0.007 |
| Meta-epidemiology (broad) | 0.003 | 0.008 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.007 | 0.009 |
| Scholarly communication | 0.005 | 0.006 |
| Open science | 0.009 | 0.010 |
| Research integrity | 0.005 | 0.008 |
| Insufficient payload (model declined to judge) | 0.040 | 0.008 |
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".