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Joint seminars of the NPI

The joint seminars of the Nuclear Physics Institute are reserved for subjects extending the scope of interests of one department (mainly seminars of the important guests, reviews on NPI groups and the outstanding results, usually in English).

Next seminars

3. 9. 2026, 10.00

Prof. RNDr. Jiří Chýla, CSc., Institute of Physics CAS
The Centenary of Wave–Particle Duality and the Birth of Quantum Mechanics

Abstract:

On 25th November 1924 Louis de Broglie defended his Thesis Recherches sur la Théorie des Quanta, in which he extended the concept of wave-particle duality developed by Einstein for the description of the behaviour of the photon to massive particles, like the electron. His Thesis started rapid development of the Wave Mechanics, one approach to emerging Quantum Mechanics, by Erwin Schrȍdinger in 1926. Independently and unrelated to de Broglie hypothesis, Heisenberg with Born and Jordan developed in 1925 the Matrix Mechanics, which Schrȍdinger showed in March 1926 to be equivalent to his Wave Mechanics. 
I will sketch the difficult life of Einstein’s idea, the last attempt of Bohr, Kramers and Slater to save classical physics for the description of atomic phenomena and key role played by Compton experiments with scattering of X-rays on electrons for the final acceptance of the Einstein conception of the photon. I will emphasize the influence of de Broglie idea of matter waves on Schrȍdinger and will show that Schrȍdinger adopted it, but chose its completely different realization based on Hamilton-Jacobi equation of classical physics. I will recall that the final confirmation of the physical relevance of de Broglie’s idea of matter waves came from diffraction experiments of Davisson and Germer with electrons. And I will close with the subtle question of interpretation of matter waves by Max Born. 

 24. 9. 2026, 10.00

Kyrylo Merkotan, Ph.D., DHIP NPI CAS
Neutral Pion Production in Au+Au Collisions Studied Using the HADES Electromagnetic Calorimeter ECAL

Abstract: 

The High-Acceptance Dielectron Spectrometer (HADES) at the SIS18 synchrotron of FAIR/GSI Darmstadt investigates strongly interacting matter created in heavy-ion collisions at beam energies of a few GeV per nucleon. In this energy regime, collisions of heavy nuclei provide access to high baryon densities and allow the study of particle production and collective phenomena in dense nuclear matter. The HADES physics program covers a broad range of topics, including dielectron spectroscopy, strangeness production, and collective flow.
The Electromagnetic Calorimeter (ECAL), developed and installed by Czech group from the Nuclear Physics Institute of the CAS together with colleagues from Poland and Germany, extends HADES towards photon measurements and neutral-meson reconstruction through their two-photon decay channels. Neutral pions are particularly relevant for the interpretation of dielectron measurements and provide an additional observable for studying particle production in heavy-ion collisions.
This seminar will focus on the analysis of Au+Au collisions at a beam kinetic energy of 800 AMeV, with neutral pions reconstructed through their π⁰ → γγ decay using ECAL. The performance of the calorimeter relevant for the analysis will be discussed together with the current status of the analysis. The results obtained so far on neutral pion production and pion flow will be presented and discussed in the context of previous HADES measurements. The seminar will also address the prospects for further studies of neutral pion production and collective phenomena in the Au+Au system.

Archive

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2022

  • Monday, September 9, 2019 - 10:00
    A. Turbiner (ICN-UNAM, Mexico and Stony Brook University, USA) 
    Choreography in Physics

 

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