Effective Yet Elusive: Exploring Single-Particles
17-21 November 2025
PROGRAM 
ProgramESNTnovESPE2025.pdf
Effective yet elusive: exploring single-particles
Organizers: Louis Heitz (IJCLab, contact), J.-P. Ebran (CEA DAM, contact), E. Khan (IJCLab), D. Verney (IJCLab)
Effective Single-Particle Energies (ESPEs) have been a cornerstone of nuclear structure research, providing theoretical insights into nuclear shell evolution. Since the seminal work of Mayer to understand the existence of the so-called magic numbers, a wealth of observables have shown to be easily understood within the picture of nucleons sitting on single-particles states.
However, ESPEs present a fundamental limitation: they are theoretical constructs lacking direct experimental observability.
Our workshop aims to address this critical challenge by identifying and developing robust, experimentally accessible observables that can reliably characterize nuclear magicity.
The goals of the workshop are to:
1. Build bridges between experimental and theoretical quantities,
2. Clarify the usefulness / limitations of single particle energies,
3. Provide theoretical mechanisms to interpret experimental findings,
4. Identify relevant experimental observables to compare with theoretical calculations.
Introductory lectures
• David Verney (IJCLab) The pervasive ubiquity of shell effects and the vexing necessity of their conceptual companions
• Olivier Sorlin (GANIL) TBA (Shell structure : measurements and mechanisms)
• Thomas Duguet (CEA Saclay DRF) Calculation and use of effective single-particle energies
• Alfredo Poves (Universidad autónoma de Madrid) TBA
TALKS
• Vittorio Somà (CEA Saclay DRF) Calculation of ESPE in ab initio approaches (Emergence of magicity)
• Louis Heitz (CEA Saclay DRF & IJCLab) Use of ESPE as indicators in SR-EDF calculations
• Chloë Hebborn (IJCLab) Uncertainties in spectroscopic studies using transfer and knockout reactions
• Michael Bender (LP2I Lyon) Single-particle energies in self-consistent mean-field models and their connection to observables
• Louis Lalanne (IJCLab) Nuclear moments and charge radii probed with laser spectroscopy
• Vladimir Manea (IJCLab) TBA (Other observables : mass measurements)
• Benjamin Kay (Argonne National Laboratory) Single-particle energies and weak binding effects
Round Table I: What Do We Mean by a Single-Particle?
Round Table II: What Alternative Indicators for Modern Approaches?
Round Table III: Identifying Robust Theory–Experiment Comparisons
Round Table IV: Strengthening the Theory–Experiment Dialogue
Program (updated 10th Sept)
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Monday 17th Nov.
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Tuesday 18 |
Wednesday 19 |
Thursday 20 |
Friday 21 |
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| 9h15 | Welcome | ||||
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9h30 |
D. Verney
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O. Sorlin | TBA | M. Bender |
Round table IV
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| 10h45 | Break | Break | Break | Break | Break |
| 11h |
T. Duguet
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C. Hebborn | B. Kay |
V. Manea |
TBA |
| 12h15 | Lunch |
Lunch |
Lunch |
Lunch | Lunch |
| 14h | A. Poves |
V. Somà |
L. Lalanne
|
L. Heitz |
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| 15h | Break |
Break |
Break |
Break |
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| 15h30 | A. Poves |
Round Table I* |
Round Table II * |
Round table III* |
|
| 16h30 | End |
End |
End |
End |
End |
Round tables start at 15:30 and are expected to end at 16:30.
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Création-contact Web ESNT : Valérie Lapoux
