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Neutrino oscillations Jan Sobczyk (University of Wroclaw)

Neutrinos have intrigued physicists for years and also... inspire artists. The lightest known elementary particles are extremely penetrating, almost elusive. Studying them requires high intensity sources as well as huge detectors.

The existence of neutrinos was postulated in 1930 by Wolfgang Pauli to save the principles of conservation of energy and momentum in radioactive decays. The existence of neutrinos was confirmed experimentally only in 1956 by Frederick Reines and Clyde Cowan.

The most spectacular property of neutrinos is their oscillations: transition from one to another “flavor” states (electron, muon, tau) during free propagation.

The oscillation phenomenon is observed for natural sources of solar and atmospheric neutrinos as well as for reactor and accelerator neutrinos.

Perhaps the most unusual neutrino laboratory is located at the South Pole: an ice sheet is used to register neutrinos!

Currently, two large oscillation experiments are being prepared in the USA (DUNE) and in Japan (HyperKamiokande). Their aim is to observe the phenomenon of CP symmetry violation in the lepton sector of the Standard Model.

Jan Sobczyk is a professor at the Institute of Theoretical Physics of the University of Wrocław.

In the early years of his career, he specialized in mathematical physics.

From around 2000, thanks to cooperation with prof. Danuta Kiełczewska, prof. Agnieszka Zalewska, prof. Ewa Rondio and prof. Jan Kisiel the started to investigate properties of neutrinos.

He specializes in modeling the interactions of neutrinos with nuclei.

Together with his colleagues in Wrocław, he developed the NuWro neutrino Monte Carlo generator.

October 17, 2020 at 10.15am

Auditorium of Faculty of Physics, Univeristy of Warsaw

Credits:

Photos by Hyper-Kamiokande, Wikimedia Commons