Personal web page : http://irfu.cea.fr/Pisp/thierry.lasserre/
Laboratory link : http://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=3427
The proposed thesis focuses on the detection of neutrinos emitted by nuclear reactors according to the coherent diffusion process, first demonstrated in 2017 with neutrinos from a spallation source of a few tens of MeV. The Nu-Cleus experiment, which is the subject of the thesis, is currently at the end of its design phase. It will be deployed at the Chooz nuclear power plant from 2019. A new detection site, located between the two cores of the plant, will be used for the measurement. Detection will be done with mini-bolometers with an extremely low detection threshold, in the order of 10 eV, in order to observe small nuclear retreats induced by neutrinos. A first phase of the experiment, between 2020 and 2021, will use a detector mass of around 10 grams. This reduction in fiduciary mass will represent a technological breakthrough in neutrino physics. A network of around 100 bolometers will then be used to conduct an innovative physics programme: standard model tests and research into new low-energy physics (including sterile neutrinos), weak nucleus shape factors, application to reactor monitoring.
The main thesis work will involve the development of a simulation chain and analysis of experience data. This chain will be used to optimize detection, to carry out sensitivity studies, and finally to analyze and publish the results of the measurements. The student will also participate in the integration of the on-site experience, scheduled for 2020, followed by the commissioning of the detectors. This work will be done in close collaboration with the University of Munich, the Irfu Nuclear Physics Department, and the CNPE Chooz teams.
Irfu is firmly involved in the theme of low-energy neutrinos, with the measurement of theta-13 mixing angle by the Double Chooz experiment, non-proliferation applications by the Nucifer experiment, and sterile neutrino research by the Stereo and KATRIN experiments.
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