General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0137
Thesis topic details
Category
Corpuscular physics and outer space
Thesis topics
Prompt fission neutron multiplicity in the Resolved Resonance Region of 239Pu
Contract
Thèse
Job description
Prompt fission neutron multiplicity in the Resolved Resonance Region of 239Pu
This thesis investigates the role of the (n,gf) process on the number of prompt neutrons emitted per fission (multiplicity “nubar”) in the resolved resonance region of Pu-239 (from 0.3 to 100 eV). The emission of gamma rays prior to fission may explain the observed reduction in nubar in this energy region. In a first step, time-of-flight experiments are to be carried out at JRC's GELINA facility in Geel, Belgium. A second step of the thesis will be to use the FIFRELIN code developed in our Cadarache laboratory to simulate fission events. For resonances with a strong (n,gf) component, the gamma emitted before fission should significantly modify the spectrum of prompt fission gammas emitted by the fragments, due to a decrease in the excitation energy in the system. This phenomenon of gamma emission before fission is not yet taken into account in the FIFRELIN code, the student will have to implement a model to do so. A simple solution would be to model the process in two stages: emission of a gamma by the compound nucleus (model already implemented) and then fission of the residual nucleus (model also implemented). As part of this research work, the doctoral student will develop competence in theoretical and experimental nuclear physics
University / doctoral school
Ecole Doctorale de Physique de Grenoble (EdPHYS)
Université Grenoble Alpes
Thesis topic location
Site
Cadarache
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
SEROT Olivier olivier.serot@cea.fr
CEA
DES/IRESNE/DER/SPRC/LEPh
CEA/Cadarache
Bâtiment 230 - porte 125
13115 St-Paul-Lez-Durance Cedex
France
0442257630
Tutor / Responsible thesis director
Litaize Olivier olivier.litaize@cea.fr
CEA
DES/IRESNE/DER/SPRC/LEPH
DES/IRESNE/DER/SPRC/LEPH
Bat 230
13108 Saint Paul Lez Durance
France
04 42 25 72 57
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