Laserspectroscopie van actiniden: octupoolvervorming en gasjetkarakterisatie
Bibliographic record
Abstract
Elise Verstraelen her PhD thesis reports on a laser spectroscopy study in the actinide region and covers three main topics. Firstly, the results on in-source resonance-ionization spectroscopy of the neutron-rich actinium isotopes 225-229Ac are detailed. These measurements were performed at the TRIUMF ISAC facility in Vancouver and resulted in new data on the changes in mean-square charge radii and the magnetic dipole moments of isotopes 226,228,229Ac, which lie in one of the regions of the nuclear chart with presumed octupole deformation. In these measurements, the attained spectral resolution did not allow to resolve the full hyperfine structure. Secondly, the in-gas-jet laser spectroscopy method, which is one of the techniques that be applied to measure the (trans)actinides with an improved spectral resolution, has been characterized. An in-depth characterization of the flow properties of a Mach-8.5 de Laval nozzle, designed at the Von Karman Institute for Fluid Dynamics, is presented. Using the well-established Planar Laser-Induced Fluorescence (PLIF) as well as the recently presented and validated Planar Laser-Induced Fluorescence Spectroscopy (PLIFS) technique, relative-density profiles and hyperfine spectra of copper were measured to validate the achievable spectral resolution prior to the utilization in i.a. on-line in-gas-jet resonance ionization spectroscopy of nobelium at the SHIP set-up at GSI. Finally, the initial commissioning of a new laser laboratory (IGLIS II) is presented with the aim to identify and characterize new, efficient laser ionization schemes with particular sensitivities to determine the nuclear observables, that can be compared with atomic theory calculations and used during i.a. on-line in-gas-jet laser-spectroscopy experiments at the S3 Low Energy Branch (LEB) facility at GANIL, France.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".