Isomeric States in the Rapid Neutron Capture Process

The rapid neutron capture process, the r-process, is responsible for creating around a half of the nuclei above A ≈ 60. The r-process nucleosynthesis is simulated with a nuclear reaction network that evolves the system according to the given parameters. The nuclear reaction networks involve thousand...

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Main Author: Winter, Miikka
Other Authors: Faculty of Sciences, Matemaattis-luonnontieteellinen tiedekunta, Department of Physics, Fysiikan laitos, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2024
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/94509
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author Winter, Miikka
author2 Faculty of Sciences Matemaattis-luonnontieteellinen tiedekunta Department of Physics Fysiikan laitos University of Jyväskylä Jyväskylän yliopisto
author_facet Winter, Miikka Faculty of Sciences Matemaattis-luonnontieteellinen tiedekunta Department of Physics Fysiikan laitos University of Jyväskylä Jyväskylän yliopisto Winter, Miikka Faculty of Sciences Matemaattis-luonnontieteellinen tiedekunta Department of Physics Fysiikan laitos University of Jyväskylä Jyväskylän yliopisto
author_sort Winter, Miikka
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description The rapid neutron capture process, the r-process, is responsible for creating around a half of the nuclei above A ≈ 60. The r-process nucleosynthesis is simulated with a nuclear reaction network that evolves the system according to the given parameters. The nuclear reaction networks involve thousands of different nuclides, but in general, they only utilise the ground state nuclei, and not isomeric states, i.e. the metastable states of the nuclei. However, in recent years, there has been research on isomers and their effect on the r-process nucleosynthesis. The so-called astromers are isomers that potentially have the greatest effect on the outcome of the r-process nucleosynthesis. In this thesis, for the first time, a wide selection of isomers were added to a nuclear reaction network. The original code was modified to include isomeric states, and the results obtained with isomers were compared with the results without isomers. The nucleosynthesis code was run with five different initial conditions. Abundances of elements were compared at t = 1 Ga, and the total heating was compared during the first 1000 days after the r-process. The obtained results show not only that the code works with the added isomers but also that the results with the added isomers show some expected differences to the reference results without isomers. The differences are subtle, and especially the location of the added isomers with respect to the r-process path determine, what is the effectiveness of the isomers to the results.
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The r-process nucleosynthesis is simulated with a\nnuclear reaction network that evolves the system according to the given parameters.\nThe nuclear reaction networks involve thousands of different nuclides, but in general,\nthey only utilise the ground state nuclei, and not isomeric states, i.e. the metastable\nstates of the nuclei. However, in recent years, there has been research on isomers and their effect on the r-process nucleosynthesis. The so-called astromers are isomers that potentially have the greatest effect on the outcome of the r-process nucleosynthesis.\nIn this thesis, for the first time, a wide selection of isomers were added to a nuclear\nreaction network. The original code was modified to include isomeric states, and the\nresults obtained with isomers were compared with the results without isomers. The\nnucleosynthesis code was run with five different initial conditions. 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spellingShingle Winter, Miikka Isomeric States in the Rapid Neutron Capture Process r-process isomers astromers nucleosynthesis Physics Fysiikka 4021 ydinfysiikka astrofysiikka simulointi nuclear physics astrophysics simulation
title Isomeric States in the Rapid Neutron Capture Process
title_full Isomeric States in the Rapid Neutron Capture Process
title_fullStr Isomeric States in the Rapid Neutron Capture Process Isomeric States in the Rapid Neutron Capture Process
title_full_unstemmed Isomeric States in the Rapid Neutron Capture Process Isomeric States in the Rapid Neutron Capture Process
title_short Isomeric States in the Rapid Neutron Capture Process
title_sort isomeric states in the rapid neutron capture process
title_txtP Isomeric States in the Rapid Neutron Capture Process
topic r-process isomers astromers nucleosynthesis Physics Fysiikka 4021 ydinfysiikka astrofysiikka simulointi nuclear physics astrophysics simulation
topic_facet 4021 Fysiikka Physics astrofysiikka astromers astrophysics isomers nuclear physics nucleosynthesis r-process simulation simulointi ydinfysiikka
url https://jyx.jyu.fi/handle/123456789/94509 http://www.urn.fi/URN:NBN:fi:jyu-202404263137
work_keys_str_mv AT wintermiikka isomericstatesintherapidneutroncaptureprocess