Inverse kinematics study of the energy levels of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Ne</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>21</mml:mn> </mml:mmultiscripts> </mml:math> populated with the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mi>Ne</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>20</mml:mn> </mml:mmultiscripts> <mml:mo>+</mml:mo> <mml:mi>d</mml:mi> </mml:mrow> </mml:math> reaction
Bibliographic record
Abstract
In recent years there has been significant experimental effort aimed at studying the impact of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mmultiscripts> <a:mi mathvariant="normal">O</a:mi> <a:mprescripts/> <a:none/> <a:mn>16</a:mn> </a:mmultiscripts> </a:math> neutron poisoning on the weak <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mi>s</c:mi> </c:math> process in rotating massive stars. Improving the understanding of energy levels in <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"> <d:mmultiscripts> <d:mi>Ne</d:mi> <d:mprescripts/> <d:none/> <d:mn>21</d:mn> </d:mmultiscripts> </d:math> is crucial to reducing uncertainties in the rates of the <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"> <e:mi>α</e:mi> </e:math> -induced reactions on <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"> <f:mmultiscripts> <f:mi mathvariant="normal">O</f:mi> <f:mprescripts/> <f:none/> <f:mn>17</f:mn> </f:mmultiscripts> </f:math> that determine the overall efficiency of the weak <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"> <h:mi>s</h:mi> </h:math> process. This paper reports on one such experiment: a study of the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"> <i:mmultiscripts> <i:mi>Ne</i:mi> <i:mprescripts/> <i:none/> <i:mn>20</i:mn> </i:mmultiscripts> </i:math> <j:math xmlns:j="http://www.w3.org/1998/Math/MathML"> <j:mrow> <j:mo>(</j:mo> <j:mi>d</j:mi> <j:mo>,</j:mo> <j:mi>p</j:mi> <j:mo>)</j:mo> <j:mmultiscripts> <j:mi>Ne</j:mi> <j:mprescripts/> <j:none/> <j:mn>21</j:mn> </j:mmultiscripts> </j:mrow> </j:math> reaction in inverse kinematics. Deduced spin-parity assignments were made based on adiabatic distorted-wave approximation analysis and neutron partial widths were estimated by comparison with a previous experiment. Of particular significance for nuclear astrophysics is the resulting neutron partial width for the 7820-keV energy level, estimated to be <k:math xmlns:k="http://www.w3.org/1998/Math/MathML"> <k:mrow> <k:mn>12</k:mn> <k:mspace width="0.16em"/> <k:mn>200</k:mn> <k:mo>(</k:mo> <k:mn>2900</k:mn> <k:mo>)</k:mo> <k:mspace width="0.16em"/> <k:mi>eV</k:mi> </k:mrow> </k:math> , and an upper limit of <n:math xmlns:n="http://www.w3.org/1998/Math/MathML"> <n:mrow> <n:mo>≤</n:mo> <n:mn>9300</n:mn> <n:mspace width="0.16em"/> <n:mi>eV</n:mi> </n:mrow> </n:math> for that of the 7749-keV energy level. These results are in tension with previous studies and therefore this paper also discusses the current state of the research into the astrophysically relevant energy levels and highlights both areas of agreement and areas of disagreement between this and various other studies that have investigated this nucleus.
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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 | 0.004 | 0.003 |
| Meta-epidemiology (narrow) | 0.003 | 0.004 |
| Meta-epidemiology (broad) | 0.002 | 0.005 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.005 | 0.005 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.007 | 0.007 |
| Research integrity | 0.003 | 0.006 |
| Insufficient payload (model declined to judge) | 0.017 | 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".