A carregar...
Publicação
Creation of p-nuclei in a type II Supernova explosion : Simulation using NucNet Tolls code
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.19 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
The present dissertation concerns the simulation of the creation of heavy neutron deficient nuclei, the so
called p nuclei. Nowadays, the explosion of a type II supernovae is pointed as the most probably
astrophysical process capable to create all the 35 p nuclei via the γ-process. To perform a numerical
network method to mimic these astrophysical process, it was firstly analysed the ingredients of the main
numerical tools for nuclear astrophysical simulation and so the nuclear potential - specifically the
optical model potential - that could influence the simulation results. Using a numerical code as NucNet
Tools , a c++ based code, it was investigated how code numerical proprieties - mainly the time step (∆
t) - and simulation physical input - as the explosion duration (∆texp) or the reaction rate library - can
influence the final results. To evaluate the simulation capacity to mimic the results to obtained in the
literature [1] it was introduced the overproduction factor (Fi) concept and so it was compared the
average normalized overproduction factor for p nuclei (Fi/F0) of both simulation results and literature
results [1]. When it were (1)compared the simulation results with the ones available in the literature [1],
it was verified the discrepancy of Fi/F0 values between simulation and literature, in particular in
intermediate mass p nuclei. We performed a (2) reaction rates sensitivity study of the creation of 184Os.
The photodessintegration - (γ, n), (γ, p) and (γ, α) - reaction rates which directly influence the creation
of 184Os were modified and it was verified its impact on the production of 184Os. In the results, it is
also possible to observe an particular underproduction of 138La. Hence, it was performed a impact
study of reaction rates (3) that directly influences the synthesis of 138La and investigated possible
changes on reaction rate which could improve simulation capacity to reproduce the literature results.
Descrição
Tese de mestrado, Física (Física Nuclear e de Partículas), 2022, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Núcleo p Supernova tipo II Reações de fotodessintegração Trajectórias de Hashimoto Factor de sobreprodução Teses de mestrado - 2023