Ispitivanje narušenja Paulijeva principa traženjem X-zraka iz zabranjenih prijelaza u olovu

master's thesis

• Title (english): Investigation of Pauli principle violation by searching X-rays from forbidden transitions in lead
• Author: Marijana Filipašić
• Mentor: Damir Bosnar (mentor)
• Committee member: Damir Bosnar (predsjednik povjerenstva)
• Committee member: Mario Basletić (član povjerenstva)
• Committee member: Maja Planinić (član povjerenstva)
• Committee member: Davor Horvatić (član povjerenstva)
• Committee member: Mihael Makek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2020-10-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Paulijev princip isključenja zabranjuje da dva fermiona u istom kvantnom sustavu budu u istom stanju. Od izrazitog je značaja no njegov uzrok još uvijek nije objasnjen. Zbog njegovog značaja, postoji značajan interes za traženje narušenja tog principa čak i u maloj mjeri. Generalno, traženje narušenja Paulijevog principa može se odviti tako da se traže već postojeći atomi ili jezgre koje krše taj princip ili da se traže prijelazi koji bi kršili Paulijev princip. U ovom diplomskom radu traži se kršenje Paulijeva principa tako da se traže X-zrake koje bi bile karakteristične za zabranjeni prijelaz u olovu. Uz pomoć 2 HPGe detektora mjeri se spektar zračenja olova kroz koje se ne propušta struja i kroz koje se propušta struja. Ukupno vrijeme mjerenja za svaki tip mjerenja iznosi 874 h. Rezultati mjerenja se kalibriraju i zbrajaju. Oduzimaju se zbrojeni grafovi za mjerenja sa strujom i mjerenja bez struje. Očekivana razlika je oko nule no konačna razlika kod rađenih mjerenja nije u tom području te je potrebno ispitati zašto se konačna razlika ne slaže s predviđanjima. Limit za narušenje Paulijeva principa se zbog toga nije računao.

Abstract (english)

The Pauli principle of exclusion forbids for two fermions to be in the same quantum state while there are in the same system. It has significant meaning, but his cause is still not explained. Because of his meaning there is a significant interest in searching for his violation even if it is in a small measure. Generally, search for Pauli principle violation can be done in two ways. There can be a search for atoms or cores that are already violating the principle or there can be a search for forbidden transition that violates the principle. In this dissertation, Pauli principle violation is sought by looking for X-rays that would be characteristic of the forbidden transition in lead. The radiation spectrum of lead through which current is not passed and through which current is passed is measured by using two HPGe detectors. Total measurement time for each type of measurement is 874 h. The measurement results are calibrated and summed. The summed graphs for measurements without current and with current are subtracted. The expected difference is around zero, but the final difference in the measurements is not in this area, so it is necessary to examine why the final difference does not agree with the predictions. The limit for Pauli principle violation was therefore not calculated.

• Keywords: Paulijev princip isključenja; narušenje Paulijeva principa isključenja; Fermi-Diracova statistika
• Keywords (english): Pauli exclusion principle; Pauli principle violation; Fermi-Dirac statistics
• Language: croatian
• URN:NBN: urn:nbn:hr:217:863431
• 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; Embargo expiration date: 2021-04-21
• Created on: 2021-01-04 13:57:06