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Browsing by Author "Nishimura, N."
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Abundance uncertainties obtained with the PIZBUIN framework for Monte Carlo reaction rate variations
Rauscher, T.; Nishimura, N.; Cescutti, G.; Hirschi, R.; Murphy, A. St J. (American Institute of Physics (AIP), 2018-04-25)Uncertainties in nucleosynthesis models originating from uncertainties in astrophysical reaction rates were estimated in a Monte Carlo variation procedure. Thousands of rates were simultaneously varied within individual, ... -
Impacts of nuclear-physics uncertainty in stellar temperatures on the s-process nucleosynthesis
Nishimura, N.; Cescutti, G.; Hirschi, R.; Rauscher, T.; Hartogh, J. Den; Murphy, A. St J. (The Physical Society of Japan, 2017-02-28)We evaluated the uncertainty relevant to s-process nucleosynthesis using a Monte-Carlo centred approach. We are based on a realistic and general prescription of temperature dependent uncertainty for the reactions. We ... -
Production Uncertainties of p-Nuclei in the γ-Process in Massive Stars Using a Monte Carlo Approach
Rauscher, T.; Nishimura, N.; Hirschi, R.; Cescutti, G.; Murphy, A. St J.; Heger, A. (2017-02-28)Proton-rich nuclei, the so-called p-nuclei, are made in photodisintegration processes in outer shells of massive stars in the course of the final supernova explosion. Nuclear uncertainties in the production of these nuclei ... -
The s-process nucleosynthesis : Impact of the uncertainties in the nuclear physics determined by monte carlo variations
Cescutti, G.; Nishimura, N.; Hirschi, R.; Rauscher, T.; den Hartogh, J. W.; Murphy, A. St J. (2017-10-01)We investigated the impact of uncertainties in neutron-capture and weak reactions (on heavy elements) on the s-process nucleosynthesis in low-mass stars and massive stars using a Monte-Carlo based approach. We performed ... -
Sensitivity to neutron captures and β-decays of the enhanced s-process in rotating massive stars at low metallicities
Nishimura, N.; Hirschi, R.; Rauscher, T. (2018-01-31)The s-process in massive stars, producing nuclei up to A ≈ 90, has a different behaviour at low metallicity if stellar rotation is significant. This enhanced s-process is distinct from the s-process in massive stars around ... -
Theory considerations for nucleosynthesis beyond Fe with special emphasis on p-nuclei in massive stars
Rauscher, T.; Nishimura, N.; Hirschi, R. (American Institute of Physics (AIP), 2016-06-21)Nucleosynthesis of heavy elements requires the use of different experimental and theoretical methods to determine astrophysical reaction rates than light element nucleosynthesis. Additionally, there are also larger ... -
Uncertainties in s-process nucleosynthesis in low-mass stars determined from Monte Carlo variations
Cescutti, G.; Hirschi, R.; Nishimura, N.; den Hartogh, J. W.; Rauscher, T.; Murphy, A. St J.; Cristallo, S. (2018-08-21)The main s-process taking place in low-mass stars produces about half of the elements heavier than iron. It is therefore very important to determine the importance and impact of nuclear physics uncertainties on this process. ... -
Uncertainties in the production of p nuclei in massive stars obtained from Monte Carlo variations
Rauscher, T.; Nishimura, N.; Hirschi, R.; Cescutti, G.; Murphy, A. St J.; Heger, A. (2016-12-21)Nuclear uncertainties in the production of $p$ nuclei in massive stars have been quantified in a Monte Carlo procedure. Bespoke temperature-dependent uncertainties were assigned to different types of reactions involving ... -
Uncertainties in the production of p nuclides in thermonuclear supernovae determined by Monte Carlo variations
Nishimura, N.; Rauscher, T.; Hirschi, R.; Murphy, A. St J.; Cescutti, G.; Travaglio, C. (2018-03-01)Thermonuclear supernovae originating from the explosion of a white dwarf accreting mass from a companion star have been suggested as a site for the production of p nuclides. Such nuclei are produced during the explosion, ... -
Uncertainties in νp-process nucleosynthesis from Monte Carlo variation of reaction rates
Nishimura, N.; Rauscher, T.; Hirschi, R.; Cescutti, G.; Murphy, A. St J.; Fröhlich, C. (2019-10)It has been suggested that a νp-process can occur when hot, dense, and proton-rich matter is expanding within a strong flux of antineutrinos. In such an environment, proton-rich nuclides can be produced in sequences of ...