prikaz prve stranice dokumenta Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće
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master's thesis
Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće
Zagreb: University of Zagreb, Faculty of Science, 2019. urn:nbn:hr:217:285432
Ravlić, Ante
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

Cite this document

Ravlić, A. (2019). Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:285432

Ravlić, Ante. "Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće." Master's thesis, University of Zagreb, Faculty of Science, 2019. https://urn.nsk.hr/urn:nbn:hr:217:285432

Ravlić, Ante. "Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće." Master's thesis, University of Zagreb, Faculty of Science, 2019. https://urn.nsk.hr/urn:nbn:hr:217:285432

Ravlić, A. (2019). 'Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće', Master's thesis, University of Zagreb, Faculty of Science, accessed 23 July 2024, https://urn.nsk.hr/urn:nbn:hr:217:285432

Ravlić A. Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2019 [cited 2024 July 23] Available at: https://urn.nsk.hr/urn:nbn:hr:217:285432

A. Ravlić, "Uhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:217:285432

Metadata
TitleUhvat elektrona u atomskoj jezgri u okviru relativističkog funkcionala gustoće
Title (english)Electron capture in atomic nucleus based on the relativistic energy density functional
AuthorAnte Ravlić
MentorNils Paar (mentor)
Committee memberNils Paar (predsjednik povjerenstva)
Committee memberTamara Nikšić (član povjerenstva)
Committee memberMatko Milin (član povjerenstva)
Committee memberMirko Planinić (član povjerenstva)
Committee memberKrešimir Pavlovski (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2019-06-13, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract
U okviru ovog rada razvijen je teorijski formalizam za opis nuklearnih procesa slabog međudjelovanja koji se odvijaju u unutrašnjosti zvijezde u fazi koja prethodi eksploziji supernove. Proučavali smo proces uhvata elektrona na atomskim jezgrama koji je posebice važan za dinamiku kolapsa zvijezde. Naime, degenerirani elektronski plin pruža protutežu gravitacijskoj sili. Reakcijama uhvata elektrona smanjuje se broj elektrona, a time i tlak koji može proizvesti degenerirani elektronski plin, te također dolazi do povećanja broja neutrona u jezgrama. Za opis osnovnog stanja jezgara koristimo relativističku teoriju srednjeg polja na konačnoj temperaturi, sa uključenim korelacijama sparivanja nukleona. Istražili smo doprinose konačne temperature i korelacija sparivanja na svojstva jezgara i nuklearnih procesa u kojima te jezgre sudjeluju, u rasponu temperatura od T = 0 MeV do T ~ 2 MeV. Unutar tog raspona temperatura događa se fazni prijelaz nuklearnih jezgara iz supratekućeg u normalno stanje, a gornja granica se nalazi ispod temperature pri kojoj doprinosi nukleonskog plina postaju značajni. Relevantne nuklearne prijelaze opisujemo u okviru relativističke kvazičestične aproksimacije slučajne faze koja je razvijena za slučaj konačne temperature. Ujedinjavanjem modela za opis nuklearnog osnovnog stanja, relevantnih nuklearnih prijelaza i udarnih presjeka za uhvat elektrona, uspostavili smo jedinstveni teorijski okvir za istraživanje stopa uhvata elektrona na jezgrama koje su zastupljene u unutrašnjosti zvijezde, u uvjetima koji prethode eksploziji supernove.
Abstract (english)
In this work we have developed theoretical framework for description of nuclear processes mediated by weak interaction in presupernova stars. We study electron capture on atomic nuclei that is especially important for stellar collapse dynamics. Degenerate electron gas is providing balance against the force of gravity. The electron capture is lowering the number of available electrons and hence also degeneracy pressure, together with increasing the number of neutrons in atomic nuclei. For description of nuclear ground state we have developed relativistic mean field theory at finite temperature, including pairing correlations between nucleons. Effects of finite temperature and pairing correlations on atomic nuclei are studied, in temperature interval between T = 0 MeV and T ~ 2 MeV. This interval includes phase transition of nuclei from superfluid to normal state, and upper limit is well below the temperature where contribution from nucleon gas is significant. Relevant nuclear transitions are described using finite temperature relativistic quasiparticle random phase approximation. Unifying nuclear models for description of the ground state, nuclear transitions and electron capture cross sections, we have developed a consistent theoretical description of electron capture rates on nuclei that are abundant in the cores of presupernova stars.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:285432
Study programmeTitle: Physics; specializations in: Research
Course: Research
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: magistar/magistra fizike (magistar/magistra fizike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-09-05 11:17:46