Browsing by Author "Heger, A."

Now showing items 1-13 of 13

    • Gamma-Ray Emission of 60Fe and 26Al Radioactivity in Our Galaxy 

      Wang, W.; Siegert, Thomas; Dai, Z. G.; Diehl, R.; Greiner, J.; Heger, A.; Krause, M.; Lang, M.; Pleintinger, M. M. M.; Zhang, X. L. (2020-02-04)
      The isotopes 60Fe and 26Al originate from massive stars and their supernovae, reflecting ongoing nucleosynthesis in the Galaxy. We studied the gamma-ray emission from these isotopes at characteristic energies 1173, 1332, ...

    • Hydrostatic and explosive nucleosynthesis in massive stars using improved nuclear and stellar physics 

      Rauscher, T.; Heger, A.; Hoffman, R. D.; Woosley, S.E. (2003-05-05)
      We have performed the first calculations to follow the evolution of all stable nuclei and their radioactive progenitors in a finely-zoned stellar model computed from the onset of central hydrogen burning through explosion ...

    • Massive star evolution : nucleosynthesis and nuclear reaction rate uncertainties 

      Heger, A.; Woosley, S.E.; Rauscher, T.; Hoffman, R. D.; Boyes, M.M. (2002-07)
      We present a nucleosynthesis calculation of a 25 M-circle dot star of solar composition that includes all relevant isotopes up to polonium. We follow the stellar evolution from hydrogen burning till iron core collapse and ...

    • Models for Type I X-ray bursts with improved nuclear physics 

      Woosley, S.E.; Heger, A.; Cumming, A.; Hoffman, R. D.; Pruet, J.; Rauscher, T.; Fisker, J. L.; Schatz, H.; Brown, B.A.; Wiescher, M. (2004-03)
      Multizone models of Type I X-ray bursts are presented that use an adaptive nuclear reaction network of unprecedented size, up to 1300 isotopes, for energy generation and include the most recent measurements and estimates ...

    • Nuclear data needs for the study of nucleosynthesis in massive stars 

      Woosley, S.E.; Heger, A.; Rauscher, T.; Hoffman, R. D. (2003-05-05)
      The critical nuclear physics needed to calculate the evolution of and nucleosynthesis in massive stars is reviewed with emphasis on the uncertainties. Some reaction rates - the most important and uncertain still being C-12 ...

    • Nucleosynthesis in massive stars revisited 

      Rauscher, T.; Heger, A.; Hoffman, R. D.; Woosley, S.E. (2001-05-21)
      We have performed the first calculations to follow the evolution of all stable nuclei and their radioactive progenitors in a finely-zoned stellar model computed from the onset of central hydrogen burning through explosion ...

    • Nucleosynthesis in massive stars using extended adaptive nuclear reaction networks 

      Heger, A.; Rauscher, T.; Hoffman, R. D.; Woosley, S.E. (American Institute of Physics (AIP), 2001)
      We present the first calculations to follow the evolution of all stable isotopes and their abundant radioactive progenitors in a finely zoned stellar model from the onset of central hydrogen burning through explosion as a ...

    • Nucleosynthesis in massive stars with improved nuclear and stellar physics 

      Rauscher, T.; Heger, A.; Hoffman, R. D.; Woosley, S.E. (2002-09-01)
      We present the first calculations to follow the evolution of all stable nuclei and their radioactive progenitors in stellar models computed from the onset of central hydrogen burning through explosion as Type II supernovae. ...

    • Nucleosynthesis of heavy elements in massive stars 

      Heger, A.; Woosley, S.E.; Langanke, K.; Kolbe, E.; Rauscher, T.; Hoffman, R. D. (2003-05-05)
      We present nucleosynthesis results form calculations that follow the evolution of massive stars from their birth on the main sequence through their explosion as supernovae. Our simulations include all relevant isotopes and ...

    • 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 ...

    • Role of Core-collapse Supernovae in Explaining Solar System Abundances of p Nuclides 

      Travaglio, C.; Rauscher, T.; Heger, A.; Pignatari, Marco; West, C. (2018-02-07)
      The production of the heavy stable proton-rich isotopes between 74Se and 196Hg - the p nuclides - is due to the contribution from different nucleosynthesis processes, activated in different types of stars. Whereas these ...

    • Sensitivity of the C and O production on the 3 alpha rate 

      Schlattl, H.; Heger, A.; Oberhummer, H.; Rauscher, T.; Csoto, A. (2004)
      We investigate the dependence of the carbon and oxygen production in stars on the 3alpha rate by varying the energy of the 0(2)(+)-state of (12)C and determine the resulting yields for a selection of low-mass, intermediate-mass ...

    • 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 ...