for a student
to be hired in the frame of a project financed by the
Polish National Science Centre

In experiments investigating neutrino oscillations (Nobel Prize in 2015), it was confirmed that neutrinos
have mass, however, its absolute value is still unknown. It is also unknown whether the neutrino is a Dirac or
Majorana particle. In the latter case, the lepton number would not be conserved, which is not predicted by the
Standard Model. Confirmation that neutrinos are Majorana particles (their own antiparticles, i.e. matter and
antimatter would be the same entity) would mean that the neutrinoless double beta decay can take place. By
measuring the half-life of this process, it would be possible to determine the effective neutrino mass and infer
which neutrino (among the three lepton families) is the lightest and which is the heaviest. This would be very
important, for example, for explaining the asymmetry in the amount of matter and antimatter observed in the
Universe. Neutrinoless double beta decay is therefore of great importance for a full understanding of the
properties of neutrinos, as described within the framework of various theoretical models, or unification

The main scientific objective of the project is the search for the neutrinoless double beta decay of the 76Ge
isotope in the LEGEND-200 experiment (200 kg of germanium enriched to 86% in 76Ge). In particular, the
planned research tasks concern the development and implementation of new methods for background
reduction. By background we mean any signal that can interfere with the expected signal. It is a critical
parameter that essentially determines the success of an experiment. Candidates are expected to have some experience in experimental physics, especially in measurements with radiation detectors, and the ability to analyze data.

CV with the motivation letter and documents confirming the status of a student should be sent until
24.03.2024 to the address given below.

Dr hab. Grzegorz Zuzel, prof. UJ
Zakład Doświadczalnej Fizyki Komputerowej
Instytut Fizyki UJ, pok. F-0-20
Tel.: 012 664-48-61