Nuclear Data for the Next Decade

9 mars 2026, 00:00 → 13 mars 2026, 23:30 Europe/Paris

Amphithéâtre Farabeuf, Campus des Cordeliers, Paris

Guillaume Blanchon (CEA, DAM, DIF), Marc Dupuis (CEA, DAM, DIF), Olivier Roig (CEA), Paul INDELICATO (Laboratoire Kastler Brossel, CNRS)

We are delighted to announce the upcoming Third International Workshop on Nuclear Data for the Next Decade. This new edition is scheduled to take place in downtown Paris, from March 9th to 13th, 2026. The entire conference will take place at Campus des Cordeliers, located at 15 rue de l'école de médecine, in the latin quarter.

The aim of these conference series is to bring together researchers working on experimental and theoretical methods related to nuclear data production.

Since the second edition in 2014, nuclear-data science entered a new phase with significant methodological improvements and intensive experimental activities. Recent nuclear data evaluations broadened their scope by systematically including a wider range of nuclear reactions, notably neutron-induced reactions on unstable isotopes, charged-particle reactions, and photonuclear data. They have also significantly improved uncertainty quantification through Bayesian techniques, automated covariance production, and rigorous quality-assurance procedures. Yet, these statistical tools represent only a part of broader transformations. 

 

New experimental campaigns have greatly improved our understanding of nuclear data, notably via precise measurements such as fission yields, neutron multiplicities, and dedicated reaction cross-sections. Key new experiments using advanced detector arrays and setups significantly enhanced our capability to discriminate reaction channels and refine nuclear structure evaluations. Upcoming major infrastructures will soon provide additional high-quality data, especially for exotic beams and photonuclear reactions.

At the theoretical level, the systematic integration of microscopic nuclear models based on effective interactions has progressed significantly. Ab-initio methods already provide reliable predictions for few-body and lighter nuclei, and their application to heavier systems is actively explored. Hybrid microscopic and phenomenological approaches increasingly support data evaluations. These advances mark a crucial step towards fully integrating microscopic calculations into nuclear data production.

Artificial intelligence and machine learning techniques, once considered speculative, are now extensively applied. They provide efficient interpolation of sparse data, accelerate Monte Carlo simulations, and optimize Bayesian analyses, offering new tools to reduce uncertainties in evaluations.

 

Objectives

 

• Take stock of progress since P(ND)²-2, reviewing successes and persistent gaps in evaluations for fission, fusion, transmutation, medical isotopes, and astrophysics.
• Benchmark emerging methodologies (ML-augmented evaluations, emulators and reduced-order models, physics-informed neural networks) against traditional R-matrix, optical-model, and Hauser-Feshbach approaches.
• Identify priority experiments at new or upgraded accelerators, reactors, and laser facilities that can most effectively reduce uncertainties.
• Define best practices for covariance validation, data-format harmonisation, open-source reproducibility.
• Draft a ten-year road aligning modelling, measurement, and evaluation efforts with next-generation applications.

Key Questions to Be Addressed

These key questions will be central during the workshop discussions and will be specifically tackled during three thematic round tables, allowing participants  to collaboratively draft an initial version of the roadmap:

Experimental Priorities:

• Which single-parameter measurements will yield the largest sensitivity-weighted impact on critical applications?
• What governance and digital-infrastructure frameworks can foster open, version-controlled, community-owned data libraries for the next decade?

 

Artificial Intelligence:

• Which ML architectures demonstrably improve cross-section interpolation/extrapolation without sacrificing physics constraints?
• Can automated pipeline tools provide evaluator-vetted covariance matrices for all major projectile–target combinations and uncertainty propagation across evaluation libraries ?

 

Microscopic Models and Computational Resources: 

• What to be expected from applications of microscopic approaches based on effective forces in the near future ? Where are hybrid (microscopic + empirical) approaches still indispensable? How far can ab-initio or chiral-EFT-based models replace phenomenology for light- to medium- mass systems?
•  How can exascale resources be harnessed for global-fit evaluations and uncertainty propagation within reasonable wall-times?

Expected Outcomes

• A collectively agreed ten-year roadmap highlighting priority experimental, theoretical, and methodological developments required for robust nuclear data by 2036, published in peer-reviewed journal.
• Enhanced international cooperation linking theoretical, experimental, and applied nuclear-data communities.                            

 

Program and participation

• Scientific talks: by invitation only;
• Program: preliminary and subject to be changed;
• A limited number of seats is also available for scholars wishing to attend and follow the lastest developments in the field (registration is required);
• Registration deadline (conference attendee + conference dinner booking): 31th January 2026
  

Lunches & coffee breaks

We are pleased to provide complimentary lunches and coffee breaks for all invited participants throughout the conference.

For additional attendees, the surrounding area offers a wide range of options for all budgets- from gastronomic restaurants to affordable student meals (around 12€), particularly near acadamic hubs such as the Jussieu campus (Quartier Latin).

Social Events

 

We are delighted to host the conference dinner on Thursday, 12 March, in the Hansi Salon at Brasserie Bofinger, 5–7 rue de la Bastille, 75004 Paris.

Details for payment will be communicated shortly.

·       

Venue

 

 The exact  Conference address:

Campus des Cordeliers
Amphithéâtre "Farabeuf"
15 rue de l'école de médecine 
75006 PARIS

How to reach the conference site:

The Campus des Cordeliers, situated in the 6th arrondissement of Paris, offers a rich historical ambiance as a former 14th-century convent. Click below to view its location on Google Maps.

Metro-RER-Bus Transport information:

Subway: Line 10 (stop at Cluny-La Sorbonne) / Lines 4 and 10 (stop at Odéon)

    Bus: Line 58 (stop at Théâtre de l'Odéon) / Lines 63, 86, 87 (stop at Saint-Germain-Odéon)

• For Metro, RER and bus maps, please visit this link: https://www.ratp.fr/en/plans
• Please visit this link; you may find interesting options and prices with the Navigo week-pass. 
  http://parisbytrain.com/paris-train-metro-week-pass-navigo-decouverte/

How to reach downtown Paris by air/rail:

• From Charles de Gaulle (Roissy) airport: 
  Take RER B towards Massy or Saint-Rémy-lès-Chevreuse. One train every 15 minutes. Exit in one station serving the subway line of your accomodation in Paris.
  Another option is to take the Roissybus from the airport to the Opera station (downtown Paris).
• From Orly airport:
  First option is to take the automatic subway line 14 to downtown Paris from the airport.
  Another option is to take the Orlyval to the Antony suburban train station then take the connection to the RER B towards the north (either towards CDG airport or Mitry-Claye both service all the stations in Paris).
• From one of Paris train stations:
  Paris-Gare de Lyon services the South/South-east (Switzerland/Italy), Gare Montparnasse services the West/South-west (Spain), Gare du Nord/Gare de l'est services the North/North-east (UK, BE, GE etc...).
  All train stations are connect to Paris subway. You should plan your itinerary on https://www.ratp.fr to your hotel.

 

Accommodation

Participants must take their own travel and hotel arrangements. The region offers a large spectrum of lodging options. We recommend checking the online review prior to booking and making sure of the neighborhood and connection to subway lines. Some suggestions affordable are given below:

Hôtels in Paris close Cordeliers Campus

·         Hôtels **

o    Hôtel Saint Pierre

                            4 rue de l'Ecole de Médecine, 6e arr., 75006 Paris

o    Villa Des Princes

       19 Rue Monsieur le Prince, 6e arr., 75006 Paris, France

o    Hôtel Du Brésil

                    10 Rue Le Goff, 5e arr., 75005 Paris, France

·         Hôtels ***

o    Hôtel De Suez

31 Boulevard Saint Michel, 5e arr., 75005 Paris, France

o    Hôtel du Savoir

1, rue Racine, 6e arr., 75006 Paris, France

·         or...have a look at :

https://en.parisinfo.com/where-to-sleep-in-paris

 

Tourism

Paris hosts an extraordinary variety of attractions and activities, from world-renowned museums, concerts/spectacles to entertainment venues and free scientific lectures. Similar to transportation passes, you can purchase multi-site passes that offer access to several museum or historical landmark. To make the most of your visit, we highly recommend booking tickets online in advance to take advantage of priority access and avoid long lines. For comprehensive information on things to do in Paris, we encourage you to explore the extensive resources provided by local tourism authorities online:

• https://parisjetaime.com/eng/things-to-do-in-paris-i001
• https://www.visitparisregion.com/en

 

Website of the conference / Schedule

 

https://indico.ijclab.in2p3.fr/login/?next=/event/11675/

 

 

 

The P(ND)²-3 conference is jointly organized by CEA, Laboratoire Kastler Brossel, IJCLab/CNRS and Sorbonne Université. 

 

lun. 9 mars

08:00 Registration and welcome

Welcome to P(ND)2-3

1 Welcome and Workshop Overview

2 Opening Remarks

Orateur: Dr Stéphane Bernard (CEA)

Challenges of Nuclear Data: I

Overview of all challenges to obtain nuclear data from experiments, models with the best uncertainties for all domains needing new nuclear data.

Président de session: Stéphane Hilaire (CEA)

3 Nuclear Data Needs: Identifying the Highest Priorities for Applications

Nuclear data are key to modeling of applications involving nuclear processes and radiation. Developing new solutions in a technologically advanced society with high standards of living has become a costly process. To foster innovation at reduced cost it is important that modeling is reliable so that new developments can meet the challenges effectively and efficiently. Nuclear data libraries aim to bring the best scientific insights to the modeling community in well defined formats and with a high level of quality assurance. The author will speak about the benefits of the latest JEFF-4.0 library and the prioritized needs emerging from this project and the recent renewed interest in nuclear power.

Orateur: Dr Arjan Plompen (JRC Geel)

20260309 PND2-3 Plompen.pdf

4 Modeling for nuclear data: state-of-the-art and future perspectives

Nuclear reaction modeling for producing reliable nuclear data above the resonance region has been improved significantly in the last decade, and nuclear data evaluation based on theoretical model calculations is a common technique to produce the evaluated nuclear data libraries nowadays. Having said that, all of the models employed in the nuclear data production are not necessarily fully matured. Nuclear reaction data produced by available nuclear data production tools such as the statistical Hauser-Feshbach codes, which could have some compensations, may give a decent fit to the experimental data, albeit internally calculated quantities may not reflect the reality. One example is a pre-equilibrium model currently implemented in these nuclear data codes. Although it gives a reasonable particle emission spectrum, the calculated gamma-ray emission does not reproduce the experimental data. In this paper, we summarize the nuclear reaction models currently used in the nuclear data studies, then discuss what are the crucial subjects we need to address to improve the nuclear data for science and technology. The subjects include neutron scattering, capture, and fission. [LA-UR-25-32301]

Orateur: Dr Toshihiko Kawano (LANL)

PNDND_Kawano.pdf

5 Needs of Uncertainties Quantification

How to optimize uncertainties

Orateur: Dr Cyrille de Saint Jean (CEA)

PND2_3 Uncertainties_CDSJ.pptx

10:30 Coffee and more

Challenges of Nuclear Data: II

Président de session: Jean-Paul EBRAN (CEA)

6 Nuclear Data versus Machine Learning

Orateur: Dr Denise Neudecker (LANL)

7 ND for Reactors: What we need for GIV, for SMR, for all solutions

Orateur: Dr David Bernard

P(ND)2-3_DBernard_090326.pptx

12:00 Lunch and Poster session

Challenges of Nuclear Data: III

Président de session: Jean-Paul EBRAN (CEA)

8 Nuclear Data for Astrophysics

Astrophysics is the Physics of the Universe. It applies the laws and principles of physics to understand how objects in the cosmos form, behave, and evolve. A key branch of this field is Nuclear Astrophysics, which focuses on how nuclear processes drive cosmic phenomena (in particular, energy production in stars, element synthesis, and stellar evolution). This talk explores the current nuclear physics needs in astrophysical modeling, with emphasis in stellar explosions. We will review which are the main nuclear paths and processes that govern nucleosynthesis in stars, identifying key uncertain nuclear reactions from sensitivity studies. We will confront experimental vs. theoretical data, needed to estimate reaction cross sections. Additional aspects, at the crossroads between nuclear and atomic physics, such as screening, EOS, and opacities, will also be discussed.

Orateur: Prof. Jordi José (UPC)

Paris2026jjpres.pdf

9 Nuclear Data for Medical Applications

For many years, nuclear medicine was focus mainly on imaging using Technecium-99m. Some therapy was conducted using Iodine-131 mainly to treat thyroid cancer. In the 2000’s, positron emission tomography (PET) imaging arrived leading to a new wave of applications for nuclear medicine especially in cancer imaging using Flurodesoxyglucose labelled with fluorine-18 (18F-FDG). Several attempt to develop therapeutic agents failed to reach the market despite some efficacy as for example the Zevalin, an antibody labelled with Yttrium-90 for some lymphomas. Since 2013, the third wave of applications has started, focused on therapeutic agent using the peptide receptor radionuclide therapy and coupling imaging and therapy in the so-called theranostics approach. This has resulted in the approval of several new products for routine use including 2 therapeutic radiophamarmaceuticals labelled with Lutecium-177: 177Lu-DOTATATE for neuroendocrine tumors approved in 2018 and 177Lu-PSMA for metastatic prostate cancers (2021). This new wave uses new radionuclides for therapy such as Lutecium-177, Copper-67, Terbium-161… for targeted beta-therapy and Actinium-225, Lead-212/Bismuth-212, Astatine-211 … for targeted alpha therapy. New imaging radionuclides are also developed to be used as imaging counterparts to apply the theranostics approach using PET such as Gallium-68 or Copper-64 or using SPECT such as Lead-203 for example. In parallel, people start to explore the potential of Auger emission. For many of these radionuclides, there is not yet a consensus on the best production method and it is important to get cross section data for the radionuclide of interest but also contaminants. The technical evolution of accelerators also open wider the nuclear reaction that can be used making different projectiles available (p,d,t, electrons) and/or allowing higher energy to be used (commercial machine available up to 70 MeV). All these lead to the need of cross section data. Acknowledgements This work has been, in part, supported by a grant from the French National Agency for Research called "Investissements d'Avenir", ISITE NEXT no. ANR-16-IDEX-0007 and SIRIC ILIAD. It has also been supported partly through funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101008571 (PRISMAP).

Orateur: Dr Ferid Haddad (Subatech / GIP Arronax)

Setup for Cross-Sections

Focus on new setups, new facilities for cross-sections

Président de session: Marine Vandebrouck (CEA Saclay Irfu/DPhN)

10 Cross sections and nucleardata measurements measurements with the SCONE detector

The SCONE device is a new large volume detector with many capabilities. After its description we will descrbe how it can be use to measure (n,xn) reactions cross sections. A first experiment has been performed at NFS with a multiplate fission chamber. Results obtained on the neutron induced fission on uranium 238 will be presented. I will conclude with the presentation of theforeseen program at NFS.

Orateur: Dr Gilbert Bélier (CEA, DAM, DIF)

Abstract.pdf

11 The Medley experimental program on light-ion emission at GANIL/NFS

An overview of the cross-section experiments done with the Medley setup at the GANIL-NFS neutron beam will be presented. Future plans for the setup and possibilities for future measurements will be discussed.

Orateur: Dr Diego Tarrio

260309_DTarrio_PerspNuclDataNextDecade_v3.pdf

12 Cross-Sections Measurements at IP2I Bordeaux

Orateur: Dr Ludovic MATHIEU (IP2I Bordeaux)

16:15 Coffer and more

13 242,240,238Pu fission cross sections with the EPIC setup

A new experimental setup dedicated to the measurement of the fission cross sections of even plutonium isotopes relative to 235U is currently under development. The goal is to provide new measurements in the neutron energy range from 1 to 20 MeV for these three isotopes, addressing nuclear data needs identified in the High Priority Request List (HPRL). The presentation will introduce the experimental setup, specifically designed to achieve efficient alpha–fission discrimination, and will discuss the first in-beam test results. The first experiment on the measurement of the 242Pu fission cross section will be scheduled at the LANSCE/FP15L this year.

Orateur: Dr Audrey Chatillon (CEA, DAM, DIF)

EPIC_PND2-3_v2.pdf

14 Constraining Neutron-Capture Cross Sections: Recent Results from the Shape and Inverse Oslo Methods

Orateur: Dr Mathis Wiedeking (Berkeley National Lab)

PND23_2026_Wiedeking.pptx

15 Cross Section Measurements in Plasmas at the National Ignition Facility

The National Ignition Facility (NIF) laser at Lawrence Livermore National Laboratory is capable of producing a plasma with temperatures ~10 keV, particle densities ~10^32 m-3, and neutron fluxes of up to 10^34 m^-2 s^-1. These features, combined with the advanced x-ray, neutron and radiochemistry diagnostics that are available at the NIF, make it uniquely suitable for carrying out experiments to investigate interactions between Plasma Physics and Nuclear Physics. The plasmas at the NIF are produced by using the laser to compress capsules (diameter ~1 mm) containing deuterium or deuterium-tritium fuel on timescales of ~1 ns, resulting in a neutron source of ~100 μm in diameter and duration ~100 ps. Trace amounts of various isotopes can also be added to the capsule. The hot plasma environment can populate excited nuclear states of these isotopes which can then undergo neutron capture reactions. Experiments using the Tm171 isotope are underway to develop a reliable platform on the NIF for measuring capture cross sections of excited state nuclei.

Orateur: Dr Brian Appelbe (Imperial College London)

16 Cross-Sections Measurements at nToF-CERN facility

Orateur: Dr Alice Manna (CERN)

mar. 10 mars

Machine Learning for Nuclear Data

Président de session: David Regnier (CEA, DAM, DIF)

17 Modeling Prompt Neutrons and Gamma Rays from Fission Fragments: CGMF and the Role of Machine Learning

Fission event generators have become the state-of-the-art tool for studying correlations between the neutrons and  rays emitted from fission and how these observables depend on the initial conditions of the fission fragments that emit them. CGMF is one such Monte Carlo fission fragment event generator, developed at Los Alamos Laboratory. Phenomenological models are constructed for the fission fragment initial conditions in mass, charge, total kinetic energy, spin, and parity, then are sample and used to initialize the decay of the daughter fragments, using the Hauser Feshbach statistical theory. Information on nuclear masses, level densities, and -ray strength functions are additionally used to emit the resulting neutrons and  rays. Energy, momentum, and angular momentum are conserved at every step in the decay. In addition to being used to understand the relationship between fission fragment properties and the emitted neutrons/ rays, CGMF has also been used in neutron multiplicity evaluations in ENDF/B-VIII.0 and ENDF/B-VIII.1. Finally, to facilitate optimization of the fission fragment initial conditions and propagate uncertainties to prompt fission observables, a novel emulator for CGMF has recently been developed. In this talk, we will discuss the underlying models within CGMF, its use in basic science and nuclear data evaluations, along with how machine learning can be used to emulate CGMF.

Orateur: Dr Amy Lovell (LANL)

18 Deep-learning nuclear cross sections

Beyond their many impacts in our societies, artificial intelligence and machine learning are also often seen as representing a paradigm shift in scientific research. Their unsurpassed ability to learn complex patterns in large datasets have found multiple applications ranging from designing powerful emulators of complex theories, to processing massive amounts of data to opening new ways to solve inverse problems. Nuclear theory offers a unique playground for the application and development of AI/ML techniques. In contrast to other natural science domains or human sciences, nuclear theory has very robust foundations yet rely on a small set of free parameters that must be calibrated on experimental data. Most if not all nuclear theories are also computationally expensive. Finally, the amount of experimental data available for training AI/ML models is quite limited. In this presentation, I will discuss recent attempts to employ deep-learning techniques to directly learn how nuclear cross sections transform across the chart of isotopes. I will also attempt to identify possible future research directions at the intersection of nuclear theory and modeling and AI/ML.

Orateur: Dr Nicolas Schunck (LLNL)

PND2.pdf

Uncertainties and propagation

Président de session: Marc Verrière (CEA)

19 UQ Developments at the IAEA-Nuclear Data Section and Perspectives

This talk will present recent developments in uncertainty quantification at the IAEA Nuclear Data Section and discuss perspectives on areas that may be worthwhile to pursue in the future.

Orateur: Dr Georg Schnabel (IAEA)

2026-03-10-georg-schnabel-uq-developments.pdf

10:15 Coffee and more

20 Uncertainty quantification for optical potentials

Optical potentials (OMPs) have been a workhorse reaction theory tool for more than sixty years, but only in the last decade has OMP uncertainty quantification (UQ) made major strides. This stock-take will review OMP UQ across three avenues: improving training methodology for phenomenological OMPs, incorporating complementary reaction data for OMP training and testing, and broadening scope away from β-stability via microscopic and dispersive models. I hope to show that OMP UQ has grown from a boutique concern of reaction theorists to a practical tool for experimentalists, evaluators, and astrophysicists who need to quantitatively assess the “degree of surprise” remaining in state-of-the-art reaction models.
Auspices statement:
This manuscript has been authored by Lawrence Livermore National Security, LLC under Contract No. DE-AC52-07NA27344 with the US. Department of Energy, with support from LDRD project 24-ERD-023. The United States Government retains, and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.
Release number: LLNL-ABS-2016583

Orateur: Dr Cole Pruit

2_C_PRUIT.pdf

21 What to expect in 2026 from microscopic nuclear modelling for keff calculations?

This presentation will summarize the impact of microscopic cross section calculations, performed with TALYS, on criticality benchmark calculations. It is a follow up of the previous work presented in NPA1054(2025)122979 applied to Pu239(n,f) (only), and generalizing the previous application to more actinides and cross sections. This helps to quantify our current knowledge without adjustment due to semi-empirical reaction models.

Orateur: Dr Dimitri Rochman (NAGRA)

pnd2.rochman.2026.pdf

22 Recent Advances in Experimental Uncertainty Quantification for Fission Yields data

Nuclear applications require a continuous improvement of nuclear data, in particular for the fission yields involved in a large time-scale calculations of reactor physics observables. Then,this time-scale requires a consistency between independent and cumulative yields. The Laboratory of Physics Studies (LEPh) of CEA Cadarache has developed a new methodology for the evaluation of fission product yields, within the framework of the recent JEFF-4.0 nuclear data library. Statistical tests of experimental datasets and data ranking are used to estimate with the best accuracy the fission yield central values, uncertainties and associated correlation matrix. In order to properly evaluate the independent and cumulative yields, the analyses of mass and chain
yields represent two key elements to perform a complete and consistent evaluation. These two attributes are the goal of the new JEFF-4 library: it provides a complete description of the correlation matrix of each observable and ensures consistency with the sum rules for the main statistical moments - namely mean values, uncertainties and correlations. Results on mass yields of four fissionning systems will be presented and discussed: 233,235U(nth,f) and 239,241Pu(nth,f). Because statistical analysis is performed using only the experimental data, the results are free of models and can be compared independently. The large amount of data used (EXFOR database) allows us to obtain unmatched precision with relative uncertainties between 1.5% and 3% for the high yields depending on the fissioning system. This new precision brings the possibility to discuss the origin of the structures in the post-neutron mass yields and their consistency with both the pre-neutron mass yields coupled with the prompt neutron multiplicity per mass. The presentation will be focused on the selection of the experimental data used and the statistical method applied to propose a reinterpretation of experimental data uncertainties in order to build a consistent dataset. The new fission product evaluations will allow us to address the physical structure in light of recent improvements in microscopic calculations.

Orateur: Dr Grégoire Kessedjian (CEA)

P(ND)2-3_Eval_kessedjian_V3.pdf

12:00 Lunch and Round Tables: IA, Uncertainties, ...

Which single-parameter and integral measurements will yield the largest sensitivity-weighted impact on critical applications?
What governance and digital-infrastructure frameworks can foster open, version-controlled, community-owned data libraries for the next decade?

Challenges of Nuclear Data: Challenges of Nuclear Data: Experimental Part

Overview of all challenges to obtain nuclear data from experiments, models with the best uncertainties for all domains needing new nuclear data.

Président de session: Stéphane Hilaire (CEA DAM DIF)

23 Experiments towards Nuclear Data

Orateur: Dr Ulli Koester

Measurements for Fission Data

Président de session: Dr Julien Taieb (CEA)

24 Fission Studies in Inverse Kinematics Using the SOFIA/R3B Experimental Setup at the GSI/FAIR Facility

The SOFIA/R3B experimental setup at the GSI/FAIR facility (Darmstadt, Germany) is designed to exploit relativistic heavy-ion beams produced at the Fragment Separator (FRS), and in the future at the Super-FRS. These spectrometers deliver intense beams of exotic heavy nuclei, which are used as projectiles in inverse kinematics for fission studies performed with the SOFIA/R3B setup. Building on the pioneering fission experiment carried out at the FRS by K.-H. Schmidt and collaborators, where the identification of the fission fragments was limited to their nuclear charge, the experimental approach has evolved significantly. The present SOFIA/R3B configuration allows for the complete kinematic characterization of the fission process through the simultaneous measurement of the charge, mass, and total kinetic energy of both fission fragments. This is achieved through the use of a double ionization chamber, which provides an excellent charge resolution of ΔZ ≈ 0.34 (FWHM), in combination with tracking detectors and a high-resolution time-of-flight wall (40 ps FWHM), allowing an accurate determination of the fragment trajectories and velocities. Together with the large-acceptance superconducting GLAD dipole magnet, these measurements yield fragment masses with a resolution of about 0.6–0.8 mass units (FWHM), enabling detailed studies of fission-fragment ! yields. This talk will focus on the results obtained from the various SOFIA/R3B fission campaigns at GSI, covering fission induced by Coulex, spallation, and quasi-free (p,2p) reactions. Finally, perspectives and new ideas for future fission experiments at FAIR will be discussed.

Orateur: Dr Jose-Luis Rodriguez-Sanchez (Coruna University)

NDND_fission_202603.pdf

25 Fission at ILL using Lohengrin spectrometer

The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the LPSC, the CEA and the ILL, a program of actinide fission yield measurements is ongoing at the LOHENGRIN spectrometer. Different experimental observables are achievable: mass yields, charge distributions, isomeric ratios, spectroscopic kinetic energy distributions, ionic charge – kinetic energy correlations etc. The Lohengrin separation power is better than 𝐴 Δ𝐴 > 400 allowing a mass identification up to A~160 with usual actinide target. The fission product separation is carried out according to their mass-over-ionic charge and velocity. However, the measurement of very low fission yields in the symmetry region and in the heavy far asymmetric wing of the distributions may be affected by contaminations with masses from the peaks of the fission distribution that undergo ionic charge exchange due to collisions with residual gas in the spectrometer. The velocities of such artefact ions then differ by about 5% from those of the normal ions satisfying the separator condition. Thus, an additional velocity measurement via a Time-of-Flight (ToF) system can reject such
background artefact ions and improve the precision of the mass yield measurements. For this purpose, the ToF condition is added to the presently practiced ΔE-E analysis with a split-anode ionization chamber. The new ToF system uses two 50 nm thin Si3N4 foils as transmission detectors. The emitted electrons are detected and serve as start and stop signals respectively. The flight distance is approximately 50 cm. Based on the upgrade of the Lohengrin spectrometer, the presentation deals with the future experimental program of interest for the nuclear data evaluation needs for applications. The new data require a specification of bias and uncertainty quantifications in order to apply statistical test
on fission models to assess the validity of physical assumptions and to propagate their consequences on nuclear data evaluation.

Orateur: Dr Grégoire Kessedjian (CEA/DES/IRESNE/DER/SPRC/LEPh)

P(ND)2-3_Lohengrin_kessedjian_V0.pdf

26 Fission at LANSCE using the CHI-NU, SPIDER, VENDETA setups

Orateur: Dr Matthew Devlin (LANL)

P(ND)2-3 Devlin.pptx

16:15 Coffee and more

27 Fission at GANIL using the PISTA/VAMOS setup

Orateur: Dr Pierre Morfouace (CEA)

GANIL_PISTA_VAMOS.pdf

28 Fission product yield data for basic physics research and applications

A.P. Tonchev1,4, A.P.D. Ramirez1, R.C. Malone1, J.A. Silano1, R. Henderson1, M.A. Stoyer1, N. Schunck1, M.E. Gooden2, J. Wilhelmy2, W.
Tornow3,4, C.R. Howell3,4, S. Finch3,4 1Lawrence Livermore National
Laboratory, Livermore, California 94550, USA 2Los Alamos National
Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA 3Triangle
Universities Nuclear Laboratory, Durham, North Carolina, 27708, USA
4Department of Physics, Duke University, Durham North Carolina, 27708,
USA

Observables from fission are essential ingredients for addressing both fundamental and applied physics problems. Despite the fact that new applications require accurate energy dependent fission product yield (FPY) data over a wide range of incident neutron energies, FPY data files evaluated to date contain only three energy points: thermal, fast, and 14 MeV incident energies. The purpose of this presentation is to give an overview of an energy-dependent FPY measurements of 235U(n,f), 238U(n,f), and 239Pu(n,f) using monoenergetic neutron beams over a wide range of incident energies [1]. The FPY results will be discussed in terms of (i) contributions from different fission modes, (ii) fission fragment isomeric ratios, (iii) comparison with inverse-kinematic fission-fragment yields, and (iv) fission yield databases [2-4].

[1] A. Tonchev et al., Nucl. Data Sheets 202, 12 (2025).
[2] M. Gooden et al., Phys. Rev. C 109, 044604 (2024).
[3] N. Schunck et al., Phys. Rev. C 107, 044312 (2023).
[4] A.P.D. Ramirez et al., Phys. Rev. C 107, 054608 (2023).

Orateur: Dr Anton Tonchev (LLNL)

29 The future of nuclear data measurements at n_TOF, CERN

Orateur: Dr Frank Gunsing (CEA)

Franck_Gunsing.pdf

mer. 11 mars

Calculations, Models for Fission Data

Président de session: David Regnier (CEA, DAM, DIF)

30 The GEF code

Orateur: Dr Karl-Heinz Schmidt

31 Microscopic large-scale fission calculations with BSkG3

Modeling fission properties, such as barriers and rates, is highly challenging. The most advanced methods, based on energy density functionals (EDFs), rely on a limited set of collective coordinates to describe the evolution of a fissioning nucleus from its ground state to scission. Commonly used degrees of freedom include the quadrupole moment, which describes axially symmetric ellipsoids, and the octupole moment, which characterizes pear shapes. Mapping the nuclear energy landscape as a function of these shapes allows for the calculation of fission pathways and reaction rates. However, this requires exploring thousands of nuclear shapes, making large-scale computations prohibitively expensive [3]. To address this challenge, we employ the MOCCa nuclear structure code, which leverages the speed and numerical accuracy of a coordinate space representation. Combined with the BSkG3 model fitted to all known empirical fission barriers and isomer excitation energies this framework allows us to incorporate both triaxial and octupole deformations into fission paths while maintaining computational efficiency. This study is the first to systematically explore the fission properties of the heaviest neutron-rich isotopes with microscopic models simultaneously accounting for: (1) axial and triaxial quadrupole moments along with the axial octupole moment, (2) all nuclei, including odd and odd-odd cases, and (3) fission paths determined via the least action principle. To demonstrate its predictive power, we will compare BSkG3-based results with available experimental data, such as spontaneous fission half-lives or fission fragment yields.

Orateur: Dr Adrian Sanchez-Fernandez

ASF-PND23.pdf

32 Fission with the SPY code

There is a large variety of models to describe the fission process, from phenomenological to microscopical, with eventually a time dependence. The SPY model takes advantage of the microscopic description of the static properties of the nucleus (energy, nucleon distribution, and state density), based on the HFB method, and the simplicity of the statistical description of the fission process at the scission point, which allows one to perform systematic calculations from light fissionable nuclei like mercury isotopes up to superheavy nuclei produced during r-process stellar nucleosynthesis. The impact of fragments' nuclear properties on the fission process can easily be studied. In this work, the SPY model will be presented, and some results, including systematic calculations based on Gogny D1M nucleon-nucleon interaction, will be discussed. In conclusion, some outlooks will be given.

Orateur: Dr Jean-François Lemaitre (CEA)

10:15 Coffee and more

33 Advances and Future Perspectives in Monte Carlo Fission Data Simulations with FIFRELIN

Orateur: Dr Olivier Litaize (CEA)

PND2-3-Litaize.pdf

34 Microscopic Theory of Angular Momentum Distributions Across the Full Range of Fission Fragments

Orateur: Dr Petar Marevic (Zagreb University)

Marevic_PND23_2026.pdf

35 Spin and Deformation of Fission Fragments

The intrinsic spin of fission fragments is closely connected to their strong deformation at scission, yet its microscopic origin remains unclear within density functional theory. Although angular momentum projection techniques reproduce spin distributions qualitatively, the role played by deformation-driven angular fluctuations has not been clearly identified. In this contribution, fission fragment spin is studied within a microscopic time-dependent density functional theory framework, with emphasis on deformation effects. Spin distributions obtained from projection methods are compared with predictions based on the uncertainty relation between orientation angle and angular momentum, using angular fluctuations estimated by Monte Carlo sampling of nucleon positions. It is shown that most of the fragment spin originates from quantum uncertainty associated with the orientation of deformed fragments, dominated by quadrupole deformation with a smaller contribution from octupole deformation.

Orateur: Dr Guillaume SCAMPS (L2iT)

presentation.pdf

11:50 Lunch and Round Table: Experimental Priorities

Which single-parameter and integral measurements will yield the largest sensitivity-weighted impact on critical applications?
What governance and digital-infrastructure frameworks can foster open, version-controlled, community-owned data libraries for the next decade?

Mixing Micro/Phenomelogy

Président de session: Chloë Hebborn (IJClab)

36 Innovations in the Surrogate Reactions Method: Integrating Microscopic Theory for Improved Nuclear Data

Reliable nuclear data with quantified uncertainties are essential for basic and applied science. When measurements are not possible, evaluators rely on systematics, theory predictions, and indirect observables. This is particularly relevant for applications involving reactions with short-lived nuclei, such as simulations undertaken to understand stellar evolution and the synthesis of the elements. Integrated nuclear structure and reaction descriptions provide the basis for reliable reaction predictions, for achieving consistent evaluations across multiple isotopes, and for enabling indirect (surrogate) measurements of cross sections. This talk will focus on advances in incorporating state-of-the-art nuclear structure theory, newly-developed optical-model potentials, and improved approaches to uncertainty quantification into reaction calculations. I will discuss strategies for predicting neutron capture reactions, progress in extracting cross sections from indirect measurements, and challenges that lie ahead. This work is performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Support from the Laboratory Directed Research and Development Program at LLNL, Projects 19-ERD-017, 24-ERD-023, and 25-LW-063, is acknowledged.

Orateur: Dr Jutta Escher (LLNL)

Escher_PNDND3_20260310.pdf

37 Microscopic driven Optical Model Potentials

Orateur: Dr Hugo ARELLANO

38 Dispersive optical model: achievements & perspectives

Optical potentials, or nucleon self-energies, can be determined using a nonlocal dispersive optical model (DOM). By enforcing the dispersion relation connecting the real and imaginary part of the self-energy, both experimental scattering data and nuclear structure data are used to constrain these self-energies. The ability to simultaneously calculate both bound and scattering states positions these self-energies to consistently describe complex reactions. In this talk, I will discuss how DOM predictions of bound-state properties like neutron skins, spectroscopic factors, and high momentum content can be informed by scattering observables like total inelastic cross sections and exclusive knockout cross sections.

Orateur: Dr Mack Atkinson

atkinson-seminar-pnd23.pdf

39 Constraining Direct and Pre-equilibrium Models through Microscopic Approaches

Advanced nuclear reaction theory is indispensable for producing reliable nuclear data used for both basic science and practical applications across various fields. Microscopic approaches incorporating nuclear structure information have predictive capabilities for neutron-induced reactions. We have developed a calculation method for direct and pre-equilibrium processes in neutron-induced inelastic scattering based on a noniterative finite amplitude method (FAM) and the distorted-wave Born approximation. Scattering processes to both discrete and continuum states are consistently calculated within the same framework by solving quasiparticle random-phase approximation equations derived from the noniterative FAM. We demonstrate the capability of the developed framework for heavy nuclei by comparing the calculated results with available experimental data.

Orateur: Dr Hirokazu Sazaki

pnd2-3_sasaki.pdf

Fusion/Charged Particles

Président de session: Chloé Fougeres (CEA)

15:40 Coffee and more

40 New Frontiers in R-matrix Calculations for Charged Particle Data

Orateur: Prof. Helmut Leeb (Techn. University Vienna)

41 Green Function as a tool for Reactions

Orateur: Prof. Gregory Potel (Sevilla University)

Tools for Evaluations

Président de session: Dimitri Rochman (NAGRA)

42 RIPL-4 news

Our theoretical understanding of low-energy nuclear reactions induced by light particles has reached a reasonable degree of reliability, and nuclear modeling codes are widely used to assess and guide nuclear data evaluations (with measurements remaining crucial for data testing and benchmarking). Since such modeling codes require a considerable amount of numerical input, the International Atomic Energy Agency (IAEA) has initiated extensive efforts to develop a library of validated nuclear-model input parameters, referred to as the Reference Input Parameter Library (RIPL. Research activities officially started in 1993. The last RIPL coordinated research project on “ Recommended Input Parameter Library for Fission Cross Section Calculations” (RIPL-4) was brought to a successful conclusion in 2024, after many years of challenging work carried out through four consecutive IAEA coordinated research projects. A summary of RIPL-4 outcomes will be given.

Orateur: Prof. Stéphane Goriely (Bruxelles University)

Goriely-pnd2.pdf

43 Nuclear Data at BNL: Toward ENDF/B-IX.0

Orateur: Dr Gustavo Nobre (BNL)

Nobre_NNDC_ENDF.pdf

44 Light-Ion Reactions From First Principles

Light-ion reactions represent one of the most fascinating areas of nuclear data & theory. Residing far from the mass region where collective mean-field descriptions are valid, only a fully microscopic quantum many-body approach can be applied in hopes of reaching a predictive regime. First principles approaches offer a completely new framework for the evaluation of nuclear data, ranging from neutron standards cross sections, to thermonuclear fusion reactions. We will discuss such approaches, focusing on recent results and future prospects.

Orateur: Dr Konstantinos Kravvaris (LLNL)

PNDND_Kravvaris.pdf

jeu. 12 mars

Formalims for Nuclear Structure

Président de session: Dr Vittorio Soma (CEA)

45 PAN@CEA: Bridging Nuclear Structure and Reactions with Modern A-body Methods

A quantitative and predictive description of nuclear reactions requires a coherent treatment of nuclear interactions, many-body correlations, and reaction dynamics within a unified computational framework. In this talk, the ongoing developments of the PAN@CEA collaboration toward such an integrated A-body approach will be presented. The end goal is the design of a single, extensible code meant to consistently address nuclear structure and reactions. I will first detail the modular architecture of the structure solver, which allows for the use of a wide range of nuclear interactions—including valence-space interactions, chiral EFT interactions, and phenomenological energy density functionals such as Gogny and Skyrme—within a common numerical framework. Calculations can be performed in both harmonic-oscillator and Bessel bases, and support mean-field and beyond-mean-field approaches under spherical, axial, and triaxial symmetries, with optional breaking of parity and isospin symmetry. This flexibility enables systematic comparisons between interactions and many-body approximations while preserving a coherent treatment of symmetries and correlations. This structure module is designed to interface directly with optical-model reaction solvers, including calculable R-matrix and Lippmann–Schwinger approaches, enabling a consistent treatment of direct reactions. Extensions toward inelastic scattering and more general reaction channels are part of the ongoing development of the PAN@CEA framework.

Orateur: Dr Mikaël Frosini (CEA)

46 De-excitation gamma strength function with the QRPA approach

Orateur: Dr Sophie Péru (CEA)

47 Configuration Interaction Shell Model: Recent Developments and Applications

In this talk, I will provide a review of the calculations of photon strength functions within the Configuration Interaction Shell Model and will illustrate their importance for various applications as well as for the benchmark and developments of other many-body methods in nuclear structure.

Orateur: Dr Kamila SIEJA (IPHC)

pnd_sieja.pdf

10:15 Coffee and more

48 Challenges in beta decay calculations

Orateur: Dr Xavier Mougeot (CEA/LNHB)

PND2-3_2026_XMougeot.pdf

49 Gogny Forces versus HFB, UQ

Orateur: Dr Nathalie Pillet (CEA)

PND2_pillet2026.pdf

50 From nuclear structure to neutron-induced cross-section evaluations

Orateur: Dr Gilles Noguere (CEA)

Noguere_pnd2_2026.pdf

11:50 Lunch and Round Tables: Microscopic Models

What to be expected from applications of microscopic approaches based on effective forces in the near future ?
Where are hybrid (microscopic + empirical) approaches still indispensable?
How far can ab-initio or chiral-EFT-based models replace phenomenology for light- to medium- mass systems?
How can exascale resources be harnessed for global-fit evaluations and uncertainty propagation within reasonable wall-times?

Experiments for Nuclear Structure

Président de session: Dr Chloé Fougères (CEA)

51 Overview of the beta decay

Orateur: Dr Sylvain Leblond (CEA)

52 The AGATA multi-detector for Nuclear Structure

Orateur: Dr Emmanuel CLEMENT (GANIL)

Nuclear_Data_AGATA_clement.pdf

53 The Oslo Method for Nuclear Models Ingredients: Recent Results and Applications

Orateur: Prof. Ann-Cecilie Larsen (Olso University)

talk_Larsen_PND2-3_Paris_2026.pdf

54 Nuclear Structure and Reaction Data for Reactor Applications at IPHC

The “Nuclear Data for Reactors” research group at the Institut pluridisciplinaire Hubert-Curien (IPHC) in Strasbourg (France) has developed a comprehensive and long-term experimental program to experimentally characterize the inelastic neutron scattering reactions. These reactions play an important role in nuclear reactor physics, influencing neutron slowing-down, power distribution, and material integrity. However, significant uncertainties persist in evaluated nuclear data libraries, particularly for key isotopes in next-generation reactors. After outlining the context and motivation for studying inelastic neutron scattering, and their importance for reactor applications, this presentation will present the γ-spectrometer GRAPhEME,developed at IPHC and installed at the GELINA facility (EC-JRC, Geel), detailing its components and the methods used to perform measurements on high radioactivity samples, with high level of background. A focus of the presentation will be a review of the experimental results obtained with GRAPhEME and their impact on nuclear models and theory. Including the 238U (n,n′γ) cross sections, which have brought new insights on the modelization of spin distributions and level densities in reaction codes ; Tungsten isotopes (182, 183, 184, 186W), where several complementary datasets have tested the models for deformed nuclei ; as long as 232Th and 233U, both isotopes at the center of the thorium fuel cycle. Finally, the presentation will introduce new data recently recorded at the NFS facility (GANIL/SPIRAL2), which extends the energy range for (n,2nγ) and (n,3nγ) measurements, and discuss future perspectives, including the DELCO project for measuring conversion electrons.

Orateur: Dr Greg HENNING (IPHC)

ghenning.pdf

Nuclear Structure and Reaction Data for Reactor Applications at IPHC

55 New opportunities at FRIB

There are approximately 300 stable and 3,000 known unstable (rare) isotopes. Estimates are that over 7,000 different isotopes are bound by the nuclear force. It is now recognized that the properties of many, sometimes undiscovered, rare isotopes hold the key to understanding how to develop a comprehensive and predictive model of atomic nuclei, to accurately model a variety of astrophysical environments, and to understand the origin and history of elements in the Universe. Some of these isotopes also offer the possibility to study nature's underlying fundamental symmetries and to explore new societal applications of rare isotopes. This presentation will give a glimpse of the opportunities that arise at the Facility for Rare Isotope Beams (FRIB) that started operations at Michigan State University in 2022, A.G. is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under Award No. DESC0023633

Orateur: Prof. Alexandra Gade (FRIB)

56 Recent advances related to nuclear moment measurements: Perspectives for update of the databases

Nuclear moment measurements are a central topic in studies of exotic nuclei far away from stability, since they provide information about the composition of the wave function and the shapes of atomic nuclei. The progress in the field was reviewed recently [1-3]. In this talk I will present the recent advances in the field related to the different experimental techniques and the prospects for the next decade. I will also address the status of the nuclear moment data bases and the perspectives for their upgrade in recent years. I will also discuss the complementarity of the nuclear moment databases with data compilations of related quantities, such as charged radii, transition probabilities, molecular and crystal lattice electric field gradients, hyperfine fields, etc., and their importance for the correct understanding of the experimental results from which nuclear moments were derived. The recommendations of two successive meetings, which took place at IAEA, Vienna, related to the support and handling of the databases on nuclear moments and nuclear charge radii will be commented, too.
[1] G. Georgiev, D.L. Balabanski, A.E. Stuchbery, and H. Ueno, Nuclear electromagnetic moments in the new millennium: The sunset of high-spin physics and the sunrise of exotic nuclear studies, The European Physical Journal A (2026) under review.
[2] A. Koszorus, R. P. de Groote, B. Cheal, P. Campbell, and I. D. Moore, Nuclear structure studies by collinear laser spectroscopy, The European Physical Journal A 60, 20 (2024).
[3] X. Yang, S. Wang, S. Wilkins, and R. G. Ruiz, Laser spectroscopy for the study of exotic nuclei, Progress in Particle and Nuclear Physics 129, 104005 (2023).

Orateur: Prof. Dimiter Balabanski (ELI-NP/IFIN-HH)

16:30 Coffee

Tools for Evaluations

Président de session: Stéphane Hilaire (CEA DAM DIF)

57 Nuclear Data Evaluations of Actinides

Evaluations of nuclear reaction data for actinides are reviewed, with examples drawn from recent work conducted within the IAEA INDEN project. By combining state of the art theoretical modelling with selected and vetted experimental data for the major reaction channels, high quality evaluations with excellent integral performance can be achieved. Particular emphasis is placed on the key channels—fission, capture, and especially elastic and inelastic scattering—while highlighting the associated evaluation challenges. The new comprehensive actinide evaluations undertaken within the INDEN project demonstrate very good agreement with available differential data and show outstanding integral performance. They represent a significant step forward in the ongoing effort to provide improved nuclear data for applications and help define the roadmap for future actinide evaluations.

Orateur: Dr Roberto Capote Noy (IAEA)

58 Current Initiatives and Future Trends in WPEC Nuclear Data Activities

Orateur: Dr Anastasia Georgiadou (NEA)

PND2-3_WPEC_AGeorgiadou.pdf

59 The JEFF‑4.0 Nuclear Data Library: Status and Perspectives

Orateur: Dr Antonio Jiménez-Carrascosa (NEA)

JEFF-4_PND23_2026_JimenezCarrascosa.pptx

60 Modernizing Access to Experimental Nuclear Reaction Data: The IAEA Nuclear Reaction Data Explorer

Current nuclear data formats such as EXFOR and ENDF-6 inherit structural constraints originating from the Fortran punch-card era. While these formats have been successfully used for decades, their ASCII-based fixed-width structure makes them difficult to understand for new users and cumbersome to use in modern computational environments. As a result, tasks such as programmatic searching, version control, data retrieval, integration with plotting or visualization tools, and large-scale data utilization for AI/ML applications remain challenging. These limitations create a high entry barrier for newcomers, as effective use of ENDF-6 and EXFOR data typically requires expert knowledge and preprocessing. To address these challenges, it is essential to decouple the presentation layer from the underlying data formats and access mechanisms, enabling intuitive and format-agnostic access for entry-level users while preserving the integrity of the original data. The IAEA Nuclear Reaction Data Explorer is a web interface, Python 3–based project designed to modernize access to experimental and evaluated nuclear reaction data. It provides a reaction-based data plotter that allows users to retrieve evaluated and experimental datasets by specifying targets and reactions, including cross sections, thermal neutron cross sections, residual production cross sections, and fission yields. In addition, an EXFOR entry viewer enables easy access to experimental data without requiring prior knowledge of the EXFOR format, supporting reaction-based searches, entry visualization, and geographical analysis. The platform also offers Web APIs for computational access to data, EXFOR entries, EXFOR keyword definitions, and RIPL-3 level information, facilitating integration with external tools and workflows. Together, these developments lower entry barriers, enhance accessibility, and enable broader use of nuclear data in modern scientific and data-driven applications.

Orateur: Dr Shin Okumura (International Atomic Energy Agency)

PND2-3-Okumura.pdf

PND2-3-Okumura.pptx

ven. 13 mars

Benchmarks for Nuclear Data: Benchmarks

Which benchmarks for which Nuclear Data. Do we need others benchmarks ?

Président de session: Dr Anthony Marchix (CEA)

61 UPM Activities in Nuclear Data

Orateur: Dr Oscar Cabellos

PND2_OCabellos_March_2026-v10.pptx

62 A perspective on the role of integral benchmarks for improving nuclear data

Orateur: Dr S. Van der Mark

PND2-3_VanderMarck.pptx

63 The TRIPOLI code

Orateur: Dr Cédric Jouanne

cjouanne_tripoli.pdf

64 Perspectives on Integral Nuclear Data for the Next Decade

Orateur: Dr Catherine Percher (LLNL)

P(ND)2-Percher-IntegralData-Mar26-Final.pdf

P(ND)2-Percher-IntegralData-Mar26-Final.pptx

10:10 Coffee

Facilities for Nuclear Data

Président de session: Dr Isabelle Lantuéjoul (CEA)

65 Perspectives on setups and experiments for nuclear data with the gamma-ray beams at ELI-NP

The γ-ray beam under construction at the ELI-NP facility is projected to provide users with high-energy, high-intensity and narrow-bandwidth photon beams for nuclear structure studies. This will open the possibilities for user to use monochromatic photon beams in a European facility for photonuclear data. Some examples of these are nuclear Jπ = 1- level densities, the electric dipole photon strength functions, and high-precision (γ,n) cross-sections. Furthermore, as a part of our preparation for these measurements, we have started an experimental program of complementary measurements at the 3-MV and 9-MV Tandem facilities at IFIN-HH. Here I will present our suite of instruments, our current activities, and perspectives for the future with the availability of high-brilliance γ-ray beams.

Orateur: Dr Pär-Anders Soderstroem (ELI-NP)

soderstrom_pndnd-3.pdf

66 Surrogate reactions at heavy-ion storage rings

Neutron-induced reaction cross sections of short-lived nuclei are essential for astrophysics and applications in nuclear technology. However, these cross sections are very difficult or impossible to measure due to the difficulty to produce and handle the necessary radioactive targets. We are developing a project that uses for the first time surrogate reactions in inverse kinematics at a heavy-ion storage ring. This allows one to measure all the de-excitation probabilities as a function of the excitation energy of the nuclei formed through the surrogate reaction with unrivaled precision and indirectly determine the aforementioned cross sections. In this talk, I will present our new methodology and the results of the two first surrogate-reaction experiments that we have performed at the ESR storage ring of the GSI/FAIR facility in Darmstadt, Germany. In these experiments we have achieved a significant breakthrough by measuring for the first time the fission, gamma-ray, neutron and even two- and three-neutron emission probabilities simultaneously. The measurement of all competing decay channels sets significant constraints on fundamental quantities, including fission barriers, particle transmission coefficients, gamma-ray strength functions, and nuclear level densities. These quantities are then employed to infer (n,f), (n,gamma), (n,n'), (n,2n), and (n,3n) cross sections.

Orateur: Dr Beatriz Jurado (IP2I)

67 The NFS facility @ GANIL

The NFS (Neutrons for Science) facility at Ganil in Caen, France, offers unique worldwide fluxes of neutron beams ranging from 1 to 40 MeV. These neutrons are produced via p+Li or d+Be reactions, made possible by the beams delivered by the SPIRAL-2 linear accelerator. The resulting collimated, pulsed neutron beam enables several experiments to be performed simultaneously. In addition to the neutron beam, the facility has an irradiation station and a pneumatic sample transfer system that enable cross-section measurements using the activation technique for neutron- or ion-induced reactions. The facility has been operational since 2021, with several experiments performed to study reactions induced by neutrons, such as fission, the production of light charged particles, and (n,xng) cross-section measurements, as well as nuclear structure studies. Excitation function measurements of proton-, deuteron- or alpha-induced reactions have also been performed. This talk will present the NFS installation and its technical characteristics. Some experiments that have already been carried out or are planned for the near future will be presented.

Orateur: Dr xavier LEDOUX (GANIL)

PND2_Ledoux.pdf

68 The DANCE/DICER to MORDOR facilities

The neutron capture process represents the dominant transmutation reaction open in neutron-rich environments at energies below a few hundred keV. As such, it is essential for understanding the evolution of material in such diverse environments as stellar burning or nuclear reactors. While past decades have seen substantial experimental work on stable isotopes, for many unstable isotopes, we are still reliant on nuclear theory due to the challenges of producing and measuring neutron-induced reactions on unstable isotopes. I will discuss the present state of the art for direct measurement of neutron capture, with a focus on the role of the Los Alamos Neutron Science Center (LANSCE) with its high-intensity, high-energy proton accelerator and spallation physics program. Further, I will discuss a current LANL project which has been undertaken to perform the first neutron capture measurement in inverse kinematics to test the feasibility of a true neutron target to be coupled to an ion storage ring.

Orateur: Dr Aaron Couture (LANL)

Go into the Universe

69 How quantum is the Universe?

Orateur: Dr Patrick PETER (CNRS)

12:50 Synthesis