Zahlavi

Ústavní semináře

Ústavní semináře, obvykle vedené v anglickém jazyce, jsou vyhrazeny tématům, rozšiřujícím znalosti v oblastech zájmu jednotlivých oddělení: zejména jde o semináře významných hostů ÚJF AV ČR, referáty odborných skupin ÚJF a prezentace vynikajících výsledků. Semináře se konají v seminární místnosti ÚJF od 10 hodin.

Příští semináře:

16. 4. 2026

doc. Mgr. Pavel Stránský, Ph.D. (Institute of Particle and Nuclear Physics, MFF UK): The Birth and Death of Schrödinger’s Cats

Abstract:
Schrödinger cat states — superpositions of macroscopically distinct quantum states — provide both a testing ground for the foundations of quantum mechanics and a resource for quantum technologies. Their emergence and stability are often governed by quantum criticality. In this seminar, we will use the Rabi model, which describes a two-level system coupled to a harmonic oscillator, as a simple yet powerful platform to explore critical behaviour in quantum systems. We will see how quantum phase transitions give rise to various types of Schrödinger cat states, and how small symmetry breaking can trigger their collapse through a purely unitary process. The phenomena will be illustrated by detailed animations of the cat-state dynamics.

30. 4. 2026

Ing. David John (ODZ ÚJF): Two Clocks, One Timeline: Synergy of Radiocarbon and EPR Dating

Abstract:
Accurate dating is essential in both archaeology and wildlife crime investigations, where establishing a reliable timeline is key to interpreting past human activity or identifying the origin of illegally traded biological materials. Radiocarbon (¹⁴C) dating is one of the most reliable used methods, however it has own limitations. In certain periods, plateaus in the ¹⁴C calibration curve reduce chronological resolution, as similar radiocarbon ages can correspond to wide calendar ranges. In addition, modern anthropogenic effects, especially the burning of fossil fuels, is altering the atmospheric ¹⁴C content (the Suess effect), leading to dilution of the isotopic signal and further complicating age determination. These issues highlight the need to combine radiocarbon dating with independent methods in some cases. Electron paramagnetic resonance (EPR) spectroscopy offers such a possibility. As a retrospective dosimetric technique, EPR estimates age by measuring radiation-induced paramagnetic centers in materials. However, its practical application is not straightforward. The EPR signal of hard organic-tissue is complex to interpret, and accurate age determination also depends critically on reliable dose rate estimation.

This seminar focuses on the potential of combining ¹⁴C and EPR dating. By integrating these approaches, it is possible to reduce the impact of their individual limitations, improve chronological precision, and build more robust age models for both archaeological and forensic applications.
 

Archiv ústavních seminářů:

2026

2025

2024

 

2023

 

Pro odbornou veřejnost
O Ústavu jaderné fyziky
Oddělení
Výzkum a vývoj
Naše služby
Pro veřejnost a média
Projekt STAR
Statutární zástupce: Ing. Ondřej Svoboda, Ph.D.  •  IČ: 61389005  •  DIČ: CZ61389005  •  Číslo účtu: 671958383/0300  •  Elektronická podatelna: ujf@ujf.cas.cz  •  ID datové schránky: t8xmzqw
© Středisko společných činností AV ČR, v. v. i.