Pobuđena stanja 24Mg na astrofizički relevantnim energijama

master's thesis

• Title (english): Excited states of 24Mg at astrophysically relevant energies
• Author: Ivan Bićanić
• Mentor: Neven Soić (mentor)
• Mentor: Ivica Friščić (komentor)
• Committee member: Ivica Friščić (predsjednik povjerenstva)
• Committee member: Neven Soić (član povjerenstva)
• Committee member: Tamara Nikšić (član povjerenstva)
• Committee member: Petar Žugec (član povjerenstva)
• Committee member: Nils Paar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2023-03-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

U ovome radu su obrađeni podatci dva različita mjerenja rezonantnog elastičnog raspršenja 20^Ne(4^He, 4^He)20^Ne na debeloj plinskoj meti 4^He. Parametri eksperimentalnog postava su bili podešeni da bi se istražilo astrofizički relevantno područje energija pobuđenja jezgre 24^Mg. Iz eksperimentalnih podataka za detektirane 4^He su izračunati spektri energije pobuđenja 24^Mg za svako mjerenje, koji su potom normirani kako bi se vidjela zastupljenost pojedinog prepoznatog rezonantnog stanja u spektru. Uspoređena su detektirana rezonantna stanja oba mjerenja. Dobiveni rezultati su u skladu s ranijim eksperimentalnim rezultatima. Uočeno je ukupno 19 različitih rezonantnih stanja u jezgri 24^Mg u rasponu energija 12.50 MeV - 18.50 MeV. U drugom dijelu rada su Monte-Carlo simulacijama određeni parametri novog eksperimentalnog postava. U novom eksperimentalnom postavu bi se istom ulaznom nuklearnom reakcijom sintetizirao 24^Mg u astrofizički relevantnom području energija pobuđenja čiji bi se produkti raspada detektirali u koincidenciji, što omogućuje identifikaciju kanala raspada. Postav je dizajniran da dobro u koincidenciji detektira produkte raspada putem kanala: 12^C + 12^C, 20^Ne + 4^He i 20^Ne∗ + 4^He.

Abstract (english)

This work reports results of two different measurements of resonant elastic scattering 20^Ne(4^He, 4^He)20^Ne on a thick 4^He gas target. The parameters of the experimental setup were adjusted to investigate the astrophysically relevant range of excitation energies of the 24^Mg nucleus. From the detected 4^He experimental data, excitation energy spectra were calculated for each measurement, which were then normalized to see the representation of a particular recognized resonance state in the spectrum. The detected resonance states of both measurements were compared. Obtained results are in agreement with availible experimental results. A total of 19 different resonance states were observed in the 24^Mg nucleus in the astrophysically relevant energy range 12.50 MeV - 18.50 MeV. In the second part of the work, Monte-Carlo simulations were used to determine the parameters of a new experimental setup in which 24^Mg would be synthesized by the same input nuclear reaction in the astrophysically relevant range of excitation energies. Decay of 24^Mg would be studied again, this time in coincident measurement which enables identification of the decay channel. The setup is designed to detect in coincidance the decay products of the channels: 12^C + 12^C, 20^Ne + 4^He and 20^Ne∗ + 4^He.

• Keywords: rezonantno elastično raspršenje; rezonantna stanja; eksperiment sa debelom plinskom metom; astrofizički relevantno područje energija; Monte-Carlo simulacija; fuzija ugljika
• Keywords (english): resonant elastic scattering; resonant states; thick gas target experiment; astrophysically relevant energy range; Monte-Carlo simulation; carbon fusion
• Language: croatian
• URN:NBN: urn:nbn:hr:217:444604
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-04-20 11:31:45