Testing the Standard Model in beta decay at WISArD-ISOLDE
Last modification : Thursday, July 15, 2021
The research program at the "Instituut voor Kern- en Stralingsfysica" is
concentrated on experimental nuclear physics focusing on the study of the
strong, electromagnetic and weak interactions at play in atomic nuclei. The
research in the weak interaction group aims at investigating the symmetries
and detailed structure of this interaction at low energies using the beta
decay of exotic nuclei and ultracold neutrons. Experiments in nuclear beta
decay currently focus on searches for non-Standard Model scalar and tensor
weak interactions, the Vud quark-mixing matrix element and the weak magnetism
term in beta decay. This involves both correlation experiments and spectrum
shape measurements in the beta decay of often very short-lived radioactive
isotopes. Experiments are performed at ISOLDE (CERN, CH) and GANIL (Caen,
FR) in collaboration with international research partners. As to neutrons the
team is involved in the search for a permanent electric dipole moment at the
Paul Scherrer Institute (the nEDM Collaboration).
This research project is in the framework of an international collaboration
(with the CENBG-University of Bordeaux,the LPC Caen and University of Caen,
the Nuclear Physics Institute at Rez-Prague, and the University of Krakow).
The aim is to search for physics beyond the Standard Model, more specifically
possible scalar and/or tensor type components in the weak interaction, and
study matrix elements induced by thestrong interaction (so-called weak
magnetism), using the WISArD apparatus a tISOLDE-CERN. Scalar and tensor type
weak interactions are searched for by measuring the beta-neutrino correlation
in the beta-delayed proton decay of32Ar. A 0.2% precision is aimed at with a
detection setup that was developed followingan earlier proof-of-principle
experiment (Phys. Rev. C 101,055501 (2020)). Weak magnetism is studied by
constraining beta-particles (from e.g. a 32P source) in a strong magnetic
field thereby minimizing scattering effects and reaching a 4pi solid-angle.
You will join the ongoing research program in the weak interaction group,
where you will be responsible for the day-to-day organization of the ongoing
research projects at WISArD, the coordination and preparation of beam times
and off-line measurements, the maintenance of the apparatus, aswell as the
guidance of PhD students, and possible master and summer students joining the
We are searching for a researcher with PhD in physics, a good knowledge of
low-energy weak interactions, experience with ISOLDE-type physics research,
and good organizational qualities. Research experience at the ISOLDE-facility
itself is an advantage.
The contract will be for one year and can possibly be extended to a second
year. The starting date aimed at is September1st, 2021. After a one-month stay
at the home-institute in Leuven, the position will be full-time located at the
ISOLDE-facility at CERN, Geneva.
For more information please contact Prof. dr. Nathal Severijns, tel.: +32 16
32 72 65, mail: firstname.lastname@example.org.
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