Observation of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>μ</mml:mi><mml:mtext>s</mml:mtext></mml:math> isomer in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">In</mml:mi><mml:mn>85</mml:mn><mml:none/><mml:mprescripts/><mml:mrow><mml:mspace width="0.16em"/><mml:mspace width="0.16em"/><mml:mspace width="0.16em"/><mml:mn>49</mml:mn></mml:mrow><mml:mn>134</mml:mn></mml:mmultiscripts></mml:math>: Proton-neutron coupling “southeast” of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Sn</mml:mi><mml:mn>82</mml:mn><mml:none/><mml:mprescripts/><mml:mrow><mml:mspace width="0.16em"/><mml:mspace width="0.16em"/><mml:mspace width="0.16em"/><mml:mn>50</mml:mn></mml:mrow><mml:mn>132</mml:mn></mml:mmultiscripts></mml:math>
Bibliographic record
Abstract
We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus $^{134}\mathrm{In}$. The nuclei of interest were produced by in-flight fission of a $^{238}\mathrm{U}$ beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a $\ensuremath{\gamma}$ ray of energy 56.7(1) keV and with a half-life of ${T}_{1/2}=3.5(4)\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{s}$. Based on the comparison with shell-model calculations, we interpret the isomer as the ${I}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$ member of the $\ensuremath{\pi}0{g}_{9/2}^{\ensuremath{-}1}\ensuremath{\bigotimes}\ensuremath{\nu}1{f}_{7/2}^{3}$ multiplet, decaying to the ${I}^{\ensuremath{\pi}}={7}^{\ensuremath{-}}$ ground state with a reduced-transition probability of $B(E2;{5}^{\ensuremath{-}}\ensuremath{\rightarrow}{7}^{\ensuremath{-}})=0.53(6)\phantom{\rule{0.28em}{0ex}}\mathrm{W}.\mathrm{u}.$ Observation of this isomer, and lack of evidence in the current work for a ${I}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$ isomer decay in $^{132}\mathrm{In}$, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart ``southeast'' of $^{132}\mathrm{Sn}$, where experimental information on excited states is sparse.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.011 | 0.007 |
| Meta-epidemiology (narrow) | 0.007 | 0.013 |
| Meta-epidemiology (broad) | 0.004 | 0.011 |
| Bibliometrics | 0.004 | 0.008 |
| Science and technology studies | 0.008 | 0.010 |
| Scholarly communication | 0.008 | 0.010 |
| Open science | 0.013 | 0.014 |
| Research integrity | 0.010 | 0.013 |
| Insufficient payload (model declined to judge) | 0.148 | 0.013 |
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".