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 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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.217 | 0.126 |
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".