Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">P</mml:mi><mml:mprescripts/><mml:none/><mml:mn>35</mml:mn></mml:mmultiscripts></mml:math>using the one-proton knockout reaction
Bibliographic record
Abstract
The structure of $^{35}\mathrm{P}$ was studied with a one-proton knockout reaction at 88 MeV/u from a $^{36}\mathrm{S}$ projectile beam at NSCL. The $\ensuremath{\gamma}$ rays from the depopulation of excited states in $^{35}\mathrm{P}$ were detected with GRETINA, while the $^{35}\mathrm{P}$ nuclei were identified event-by-event in the focal plane of the S800 spectrograph. The level scheme of $^{35}\mathrm{P}$ was deduced up to 7.5 MeV using $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences. The observed levels were attributed to proton removals from the $sd$ shell and also from the deeply bound ${p}_{1/2}$ orbital. The orbital angular momentum of each state was derived from the comparison between experimental and calculated shapes of individual $(\ensuremath{\gamma}$-gated) parallel momentum distributions. Despite the use of different reactions and their associate models, spectroscopic factors, ${C}^{2}S$, derived from the $^{36}\mathrm{S}\phantom{\rule{4pt}{0ex}}(\ensuremath{-}1p)$ knockout reaction agree with those obtained earlier from $^{36}\mathrm{S}(d,^{3}\mathrm{He})$ transfer, if a reduction factor ${R}_{s}$, as deduced from inclusive one-nucleon removal cross sections, is applied to the knockout transitions. In addition to the expected proton-hole configurations, other states were observed with individual cross sections of the order of 0.5 mb. Based on their shifted parallel momentum distributions, their decay modes to negative parity states, their high excitation energy (around 4.7 MeV), and the fact that they were not observed in the $(d,^{3}\mathrm{He})$ reaction, we propose that they may result from a two-step mechanism or a nucleon-exchange reaction with subsequent neutron evaporation. Regardless of the mechanism, that could not yet be clarified, these states likely correspond to neutron core excitations in $^{35}\mathrm{P}$. This newly identified pathway, although weak, offers the possibility to selectively populate certain intruder configurations that are otherwise hard to produce and identify.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.003 |
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".