Nuclear structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Sm</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>157</mml:mn> </mml:mmultiscripts> </mml:math> via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>β</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math> decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Pm</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>157</mml:mn> </mml:mmultiscripts> </mml:math>
Bibliographic record
Abstract
Excited states of the neutron-rich nucleus $^{157}\mathrm{Sm}$ were populated through the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay of $^{157}\mathrm{Pm}$, which has a tentatively assigned ground-state spin and parity of ${J}^{\ensuremath{\pi}}=(5/{2}^{\ensuremath{-}})$. Over 30 levels have been observed, 16 of which are new, and over 45 new $\ensuremath{\gamma}$-ray transitions have been placed in the level scheme. An evolution in the ground-state configurations for $N=95$ nuclei from $5/{2}^{\ensuremath{-}}[523]$ (Er/Yb), to $5/{2}^{+}[642]$ (Dy), to $3/{2}^{\ensuremath{-}}[521]$ (Sm/Gd) can be explained based on increasing deformation from $Z=70$ to $Z=62$ and the fact that these three orbitals are energetically close to each other at deformations near ${\ensuremath{\beta}}_{2}\ensuremath{\approx}0.25--0.3$. Tentative spin and parity assignments are made for most of the states below 1500 keV based on the decay properties of the levels and using excitation-energy systematics of the various orbitals observed in $N=95$ nuclei.
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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 | 0.006 | 0.004 |
| Meta-epidemiology (narrow) | 0.007 | 0.010 |
| Meta-epidemiology (broad) | 0.004 | 0.011 |
| Bibliometrics | 0.002 | 0.006 |
| Science and technology studies | 0.007 | 0.009 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.011 | 0.013 |
| Research integrity | 0.007 | 0.011 |
| Insufficient payload (model declined to judge) | 0.013 | 0.015 |
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".