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Portail > Offres > Offre UMR6534-AURGON-017 - CDD Chercheur (H/F) : Recherche de couplages exotiques tensoriels dans la décroissance bêta de 6He

Postdoctoral researcher (M/F) : Search for exotic tensor couplings in 6He beta decay

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : jeudi 25 août 2022

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General information

Reference : UMR6534-AURGON-017
Workplace : CAEN
Date of publication : Thursday, August 4, 2022
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 October 2022
Proportion of work : Full time
Remuneration : Between 2690 € and 3099 € gross monthly
Desired level of education : PhD
Experience required : 1 to 4 years


The goal of this project is to perform the most precise measurement ever of the shape of the full energy spectrum of beta particles emitted in the decay of 6He nuclei. This measurement will enable to determine a parameter, the so-called “Fierz term”, which is sensitive to a possible contribution of exotic tensor type interactions to the weak decays. Such a contribution would be a signature of new physics beyond the standard electroweak model. The choice of this particular nucleus relies on a number of critical properties but in particular on the fact that it is possible to make a highly accurate description of the theoretical beta energy spectrum. The largest instrumental difficulty, related to the backscattering of electrons in matter, will be eliminated or strongly reduced by the appropriate design of the detection system geometries. These will fully surround the emitting source. The experiments are carried out at GANIL, Caen, using two types of radioactive beams, with either low or high energies, and with two experimental setups adapted to the beam energy. The possibility to perform complementary measurements at low and high energies with two setups enables to study systematic effects, which are very different at the two energies. GANIL is the only laboratory worldwide that is able to deliver radioactive beams of 6He nuclei at high energy, from fragmentation reaction in the LISE beam line, as well as at low energies, extracted from the SPIRAL target-source system.


Depending on skills, the successful candidate will :
- contribute to the simulations of the experimental setup, to the tests and optimization of the detection system and the real time data acquisition system.
- take part in the running of experiments and, depending on the available time, in performing a preliminary data analysis.


We seek talented and strongly motivated candidates, to work on a competitive project in a well-established research team. Candidates should have a PhD in Experimental Nuclear Physics. A familiarity with topics related to the weak interactions or with precision measurements at low energies will be a plus.

Work Context

On the research aspect, the candidate will join the MPBE group (low energy precision measurements) within the Laboratoire de Physique Corpusculaire in Caen. The laboratory performs fundamental research in nuclear physics, physics of elementary particles and fundamental interactions, and is also involved in nuclear applied research.

Constraints and risks

- Work under ionizing radiation,
- Travels in France and international.

Additional Information

Interested candidates should submit a short letter of motivation; a CV describing previous research activities and publications, and arrange for two letters of reference.

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