3rd Rencontre PhyNuBE: Fission and Nuclear Astrophysics

6 oct. 2024, 09:30 → 11 oct. 2024, 19:20 Europe/Paris

Village CNRS Oléron (France)

Fairouz HAMMACHE (IPN-Orsay), Beatriz Jurado (IN2P3/CENBG), Denis LACROIX (Institut de Physique Nucléaire), Antoine Lemasson (GANIL / CNRS UPR3266), Guillaume Scamps (L2i Toulouse, CNRS/IN2P3, UT3), sorlin olivier (GANIL)

 

The third edition of PhyNuBE of the Groupement de Recherche Resanet will take place at the CNRS center of Oléron (France) between October 6 (arrival) and October 11 (departure). We propose to adress two scientific topics that are nuclear astrophysics and nuclear fission. The meeting will comprise a series of invited overview talks, oral contributions and poster presentations.

 

The PhyNuBe scientific meetings are intended to gather and educate students and senior scientists around major scientific topics of our field, as well as reinforcing links between theory and experiment and encouraging cross-fertilize activities. 

 

The astrophysics part will cover quiescent and explosive burning phases of stars in which nuclear physics plays an essential role, such as massive stars, novae, x-ray bursts, or neutron star mergers. Theoretical aspects of stellar modeling, nuclear reaction rates, and spectroscopy will be covered. Experimentally, results from reaction cross-section measurements of astrophysical relevance involving neutral, charged particles and neutrinos will be presented and confronted to observations.

Concerning fission,  the most relevant experimental programs for measuring fission cross sections, probabilities, fission fragment properties, and the associated emitted particles will be discussed, thus highlighting the related challenges, the solutions provided, and the main results. The advances and challenges in fission theory will also be covered by discussing the latest developments in microscopic dynamical models based on the energy density functional theory and in more phenomenological models. The various talks will also illustrate the importance of the fission process for fundamental nuclear physics, societal applications, and nuclear astrophysics.

A large amount of time will be dedicated to discussions and debates, as well as outdoor activities. Finantial support for local expenses is possible on demand for a limited number of participants. Fees are estimated to 550 euros for a sinle room and 440 euros in twin rooms with double occupancy, both for full board. Bus shuttles are planned to be organized between the train station of La Rochelle and the CNRS center of Oléron. Departures of these shuttles are planned on October 06 (4.45 pm from La Rochelle) and October 11 (at around noon from Oléron). They should be synchronized with the TGV trains between Paris and La Rochelle.

 

Submission abstract: May 4^th to July 15^th 

Notification of acceptance of abstracts: July 22^nd

Registration deadline: August, 31^st

 

The PhyNuBE3 meeting is organized under the umbrella of the GDR Resanet by F. Hammache, B. Jurado, D. Lacroix, A. Lemasson, G. Scamps and O. Sorlin.

PhyNuBE 1st announcement.pdf

lundi 7 octobre

Welcome Session

1 The fundamental role of fission during r-process nucleosynthesis

Orateur: Stéphane Goriely (ULB, Bruxelles Belgium)

2 Masses and beta-decay studies for the r process

Orateur: Sara Naimi (IJCLab, Orsay, France)

10:20 Pause

3 The intermediate neutron capture process

Orateur: Arthur Choplin (ULB, Bruxelles Belgium)

4 Study of Pigmy Dipole resonances and their potential roles in nuclear astrophysics

Orateur: Iolanda Matea (IJCLab, Orsay, France)

Discussions

12:20 Lunch

5 Introduction to experiments on nuclear fission P1

Orateur: Beatriz Jurado (LP2I, Bordeaux, France)

6 Introduction to the theory of nuclear fission P1

Orateur: David Regnier (CEA/DAM, Bruyères-le-Châtel, France)

17:40 Pause

7 Fission cross sections, evaluations and measurements

Orateur: Pierre Tamagno (CEA, Cadarache, France)

Discussions: Discussion

mardi 8 octobre

8 Introduction to the theory of nuclear fission P2

Orateur: David Regnier (CEA/DAM, Bruyères-le-Châtel, France)

9 Introduction to experiments on nuclear fission P2

Orateur: Beatriz Jurado (LP2I, Bordeaux, France)

10:10 Pause

10 Measurements in inverse kinematics around the Coulomb Barrier at VAMOS

Orateur: Diego Ramos (GANIL, Caen, France)

11 Microscopic description of nuclear fission: Recent advances in the TDGCM approach

Orateur: Nathalie Pillet (CEA/DAM, Bruyères-le-Châtel, France)

Discussions: Discussion

12:20 Lunch

12 Massive stars modelling: Evolution and nucleosynthesis

Orateur: Thibaut Dumont (IPHC, Strasbourg, France)

13 Direct Measurements of Fusion Reactions of Astrophysics Impact

Orateur: Marcel Heine (IPHC, Strasbourg, France)

14 Coincidence measurements of fusion reactions involving carbon and oxygen with the high-precision STELlar LAboratory (STELLA)

Orateur: Aurélie Bonhomme (IPHC, Strasbourg, France)

Discussions

Poster Session

mercredi 9 octobre

15 The fundamental role of fission during r-process nucleosynthesis

Orateur: Stéphane Goriely (ULB, Bruxelles Belgium)

16 Neutron sources for the s-process and their experimental study

Orateur: Fairouz Hammache (IJCLab, Orsay, France)

10:15 Pause

17 Reaction models for astrophysics

Orateur: Guillaume Hupin (IJClab, Orsay, France)

Discussions

12:20 Lunch

18 State of the art on new region around neutron deficient Pb

Orateur: Christelle Schmitt (IPHC, Strasbourg, France)

16:45 Pause

19 Structure and angular momentum at scission from microscopic models

Orateur: Guillaume Scamps (L2I Toulouse, France)

20 Angular momentum and excitation energy of 120Cd/132Sn, 118Pd/134Te neutronless fragmentations in 252Cf(sf)

Orateur: Alexis Francheteau (GANIL, Caen, France)

Discussions

jeudi 10 octobre

21 Fission-fragment de-excitation as a fission probe

Orateur: Dr Jon Wilson (IJClab, Orsay, France)

22 Fission in heavy ion storage ring

Orateur: Boguslaw Wloch (LP2I, Bordeaux, France)

23 Fission studies at at NFS with SCONE

Fission modeling is still the subject of much work. The objective is to understand the structure and dynamic effects involved in this reaction. From the point of view of fission applications, the objective is to provide precise data on the fission fragments yields and kinetic energies, but also on the emission of neutrons and γ-rays. The work being carried out in numerous laboratories ultimately aims to enable the provision of such data based on theories or phenomenological models. In this presentation I will describe the new results obtained with the large SCONE detector (Solid COunter for NEutrons), based on plastic scintillator bars. The detector design includes a significant amount of Gd, in order to carry out neutron counting with an efficiency of about 70 percent for fission neutrons. In addition, by design, SCONE is also a good γ-ray calorimeter, and in particular the granularity allows to determine the average γ-ray multiplicities. I will present the experimental results of the fast neutron induced fission of uranium 238 campaign performed at the GANIL/NFS facility, for neutron energies ranging from 1 MeV to 30 MeV. The complete distributions of fission neutron multiplicities, the average total radiated γ-ray en ergy, and the average γ-ray multiplicity in the fast neutron induced fission of uranium 238 will be discussed. Furthermore, measuring the different observables continuously as a function of neutron energy makes it possible to study the effects of multi-chances which confer structures into those observables. For the first time the second chance fission probability on uranium 238 was mea- sured experimentally. In a ddition, the re-analysis of old data on uranium 235 and plutonium 239 allowed us to obtain the aforementioned probability also for these two isotopes. These measure- ments open a way to take into account the effects of multi-chance in fission, that overcomplicate the description of the neutron induced fission process. Unfolding these effects will simplify the achievement of more precise models.

Orateur: Gilbert Bélier (CEA, DAM, DIF)

10:05 Pause

24 Towards a more microscopic description of fission

Orateur: Luis Robledo (University of Madrid, Spain)

25 Measurements in inverse kinematics at relativistic energies (SOFIA)

Orateur: Audrey Chatillon (CEA/DAM, Bruyères-le-Châtel, France)

Discussions

12:15 Lunch

26 Novae & X-ray burst modeling

Orateur: Jordi Jose (UPC, Barcelona, Spain)

17:00 Pause

27 X-ray bursts studies using indirect methods

Orateur: Nicolas De Séréville (IJClab, Orsay, France)

28 Accessing explosive stellar nucleosynthesis from grounded laboratories

Orateur: Chloé Fougères (CEA/DAM, Bruyères-le-Châtel, France)

Discussions

vendredi 11 octobre

Restitution/Conclusions