Measurement of gamma rays energies at ortho-positronium decay

Pavelić, Luka (2014) Measurement of gamma rays energies at ortho-positronium decay. Diploma thesis, Faculty of Science > Department of Physics.

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Abstract

Electron and positron can be in an unstable bound state called positronium (Ps). Positronium is an exotic atom analogus to hidrogen, therefore, they share similar energy levels. The electron and positron spins can be aligned in the same direction (singlet states) or in the opposite directions (triplet states). Singlet state (para-positronium) and triple state (ortho-positronium) decay in two and three gamma rays respectively. Two different states also have different life time and decay probability. In this thesis, gamma rays energies were measured for certain emission angles of ortho-positronium decay. For detection of these photons, system of three BaF2 detectors and fast signal digitizer was used. Data analysis was made with ROOT platform.

Item Type: Thesis (Diploma thesis)
Keywords: ortho-positronium, gamma rays
Supervisor: Bosnar, Damir
Date: 30 September 2014
Number of Pages: 60
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 Nov 2014 10:14
Last Modified: 20 Jan 2017 14:04
URI: http://digre.pmf.unizg.hr/id/eprint/3388

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