Ispitivanje narušenja Paulijeva principa

master's thesis

• Title (english): Investigation of violation of the Pauli exclusion principle
• Author: Mihael Zelić
• Mentor: Damir Bosnar (mentor)
• Committee member: Damir Bosnar (predsjednik povjerenstva)
• Committee member: Dubravko Klabučar (član povjerenstva)
• Committee member: Ivan Kokanović (član povjerenstva)
• Committee member: Mario Novak (član povjerenstva)
• Committee member: Danko Radić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2019-02-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Paulijev princip zabranjuje postojanje dva fermiona u istom stanju. Iako Paulijev princip ima dalekosežne posljedice, njegov uzrok još uvijek nije objašnjen. Što isto tako znači da taj princip može biti određenoj, vrlo maloj mjeri i narušen u nekim reakcijama. Narušenja Paulijevog principa eksperimentalno su istraživana u traženju X-zraka emitiranih u prijelazima elektrona u popunjene ljuske određenih atoma, kao i traženjima gama zraka emitiranih u prijelazima u jezgrama, a koji su inače zabranjeni Paulijevim principom. U diplomskom radu smo HPGe detektorom mjerili spektar x zračenja iz olova kroz koji prolazi određena struja, odnosno postoje dodatni slobodni elektroni koji mogu, u slučaju narušenja Paulijevog principa, emitirati X-zrake određenih energija u slučaju elektronskih prijelaza u popunjeno osnovno stanje olova. Rezultati probnoga mjerenja pokazuju da bi vrijeme potrebno za mjerenje s postojećim eksperimentalnim postavom trebalo biti duže od vremena probnog mjerenja. Koristeći dva HPGe detektora potrebno je ≈ 75 h mjerenja dok je za jedan detektor potrebno ≈ 150 h.

Abstract (english)

The Pauli exclusion principle is the quantum mechanical principle which states that two or more identical fermions cannot occupy the same quantum state within a quantum system simultaneously. Although the Pauli principle has far-reaching consequences, its cause has not been explained yet, which indicates that the principle, in some specific reactions, could be violated to a point. Those instances of Pauli principle violation have been explored experimentally by searching for X-rays released during the electron transitions into filled atomic shells, as well as searching for gamma radiation that would occur in Pauli-prohibited nuclear transitions. These transitions are not allowed by the Pauli exclusion principle. In this graduate thesis we measured the spectrum of X-ray radiation from lead exposed to specific electric current utilizing HPG detectors. Exposure to electric current would allow for the existence of additional, free electrons, which, in case of a violation of the Pauli exclusion principle, could radiate X-rays of a specific energy, caused by electrons transitioning into the filled ground state of lead. The results of the test measurements indicate that the time needed for final testing, with the existing experimental setting, would be longer that the initial testing time. Specifically, utilizing one HPG detector it takes ≈ 150 h for the test. With two HPG detectors the time could be reduced to ≈ 75 h.

• Keywords: Paulijev princip isključenja; Bose Einstenova statistika; Fermi-Diracova statistika; narušenje Paulijeva principa isključenja
• Keywords (english): Pauli exclusion principle; Bose-Einstein statistics; Fermi-Dirac statistics; Violation of the Pauli exclusion principle
• Language: croatian
• URN:NBN: urn:nbn:hr:217:491458
• Study programme: Title: Physics; specializations in: Education; Course: Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije fizike (magistar/magistra edukacije fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-04-17 11:25:45