Effective Yet Elusive: Exploring Single-Particles

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17-20 November 2025

 

PROGRAM   ProgESNTwESPEnov2025vf.pdf

 

Effective yet elusive: exploring single-particles

Organizers:  Louis Heitz (CEA DRF & DAM; IJCLab; contact), J.-P. Ebran (CEA DAM), 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

     ESNTnov2025_DVerney.pdf

 

• Thomas Duguet (CEA Saclay DRF) Effective single-particle energies in many-body physics: model-independent definition and meaningful use

    ESNTnov2025_TDuguet.pdf

 

• Olivier Sorlin (GANIL) Shell evolutions and nuclear forces probed by transfer and knockout reactions

    ESNTnov2025_OSorlin.pdf

 

• Chloë Hebborn (IJCLab & FRIB)  Probing single-particle properties through nucleon-addition and removal reactions: status and challenges

     ESNTnov2025_CHebborn.pdf

 

 

TALKS

 

• Andrea Gottardo (INFN Legnaro) Electromagnetic transition strengths as probes for shell structure
    ESNTnov2025_AGottardo.pdf

 

• Wim Dickhoff (Washington University) The dispersive optical model as the interface between theory and experiment

    ESNTnov2025_WDickhoff.pdf

 

• Sophie Péru (CEA DAM DIF) Advantages and consequences of a quasi-particle vacuum in a HFB framework

   

 

• Michael Bender (LP2I Lyon) Single-particle energies in self-consistent mean-field models and their connection to observables

     ESNTnov2025_MBender.pdf

 

• Louis Lalanne (IJCLab) Nuclear moments and charge radii probed with laser spectroscopy

    ESNTnov2025_LLalanne.pdf

 

• Vittorio Somà (CEA Saclay DRF) Emergence of magicity in ab initio theories

    ESNTnov2025_VSoma.pdf    

 

• Louis Heitz (CEA DRF Irfu & DAM DIF ; IJCLab) An EDF viewpoint on shell structure evolution

   

 

• Vladimir Manea (IJCLab)  A recent view on the trends of empirical single-particle energies from atomic masses

  ESNT-DPhN seminar on Thursday: Seminar Abstract

 

 

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

 

 

PROGRAM

 

	Monday  17th Nov.	Tuesday 18	Wednesday  19	Thursday 20
9h15	Welcome
9h30	D. Verney	A. Gottardo	M. Bender	L. Heitz
10h45	Break	Break	Break	Break
11h	T. Duguet	W. Dickhoff	L. Lalanne	V. Manea Seminar
12h15	Lunch	Lunch	Lunch	Lunch
14h	O. Sorlin	S. Péru	V. Somà	Round table III
15h	Break	Break	Break	Break
15h30	C. Hebborn	Round Table I	Round Table II	Round table III
16h30	End	End	End	End

 

 

 

 

 

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Création-contact Web ESNT : Valérie Lapoux