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Browsing by Author "Kolbe, E."
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The astrophysical r-process : A comparison of calculations following adiabatic expansion with classical calculations based on neutron densities and temperatures
Freiburghaus, C.; Rembges, J.F.; Rauscher, T.; Kolbe, E.; Thielemann, Friedrich-Karl; Kratz, K.L.; Pfeiffer, B.; Cowan, J.J. (1999-05-01)The rapid neutron-capture process (r-process) encounters unstable nuclei far from beta-stability. Therefore its observable features, like the abundances, witness (still uncertain) nuclear structure as well as the conditions ... -
Calculations of fission rates for r-process nucleosynthesis
Panov, I.; Kolbe, E.; Pfeiffer, B.; Rauscher, T.; Kratz, K.L.; Thielemann, Friedrich-Karl (2005-01-24)Fission plays an important role in the r-process which is responsible; not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission ... -
Element synthesis in stars
Thielemann, Friedrich-Karl; Brachwitz, F.; Freiburghaus, C.; Kolbe, E.; Martinez-Pinedo, Gabriel; Rauscher, T.; Rembges, F.; Hix, W. R.; Liebendoerfer, M.; Mezzacappa, A.; Kratz, K.L.; Pfeiffer, B.; Langanke, K.; Nomoto, K.; Rosswog, S.; Schatz, H.; Wiescher, Michael (Elsevier, 2001)Except for H-1, H-2, He-3, He-4, and Li-7, originating from the Big Bang, all heavier elements are made in stellar evolution and stellar explosions. Nuclear physics, and in many cases nuclear structure far from stability, ... -
Explosive nucleosynthesis and the astrophysical r-process
Thielemann, Friedrich-Karl; Freiburghaus, C.; Rauscher, T.; Kolbe, E.; Pfeiffer, B.; Kratz, K.L.; Cowan, J.J. (American Institute of Physics (AIP), 1998)We give an overview of chemical equilibria in explosive burning and the role which neutron and/or proton separation energies play. We focus then on the rapid neutron-capture process (r-process) which encounters unstable ... -
Fission barriers : How do they affect the R-process?
Panov, I.; Pfeiffer, B.; Kratz, K.L.; Kolbe, E.; Rauscher, T.; Thielemann, Friedrich-Karl (World Scientific Publishing, 2004-02)Fission is an important process which is responsible not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission recycling in the ... -
Heavy elements and age determinations
Thielemann, Friedrich-Karl; Hauser, P.; Kolbe, E.; Martinez-Pinedo, Gabriel; Panov, I.; Rauscher, T.; Kratz, K.L.; Pfeiffer, B.; Rosswog, S.; Liebendoerfer, M.; Mezzacappa, A. (2002-01)The age of the universe, measured from the Big Bang to the present, is at the focus of cosmology. Its determination relies, however, on the use of stellar objects or their products. Stellar explosions, like type Ia supernovae ... -
Nuclear physics : A key ingredient in astrophysical modeling
Thielemann, Friedrich-Karl; Argast, D.; Brachwitz, F.; Fisker, J. L.; Froehlich, Carla; Hirschi, R.; Kolbe, E.; Mocelj, D.; Rauscher, T. (2005-04-18)Nuclear physics is a basic ingredient in a large number of energetic astrophysical environments which are characterized by sufficient temperatures and densities to permit scattering events among particles, leading to nuclear ... -
Nuclear physics issues of the r-process
Thielemann, Friedrich-Karl; Kolbe, E.; Martinez-Pinedo, G.; Panov, I.; Rauscher, T.; Kratz, K.L.; Pfeiffer, B.; Rosswog, S. (World Scientific Publishing, 2003)The present paper aims at understanding r-process nucleosynthesis by addressing the nuclear physics involved, the necessary environment conditions in the (stellar) production sites, and the observational constraints. We ... -
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 ... -
The r-process : Supernovae and other sources of the heaviest elements
Thielemann, Friedrich-Karl; Mocelj, D.; Panov, I.; Kolbe, E.; Rauscher, T.; Kratz, K.L.; Farouqi, K.; Pfeiffer, B.; Martinez-Pinedo, Gabriel; Kelic, A.; Langanke, K.; Schmidt, K. -H.; Zinner, N. (2007-05)Rapid neutron capture in stellar explosions is responsible for the heaviest elements in nature, up to Th, U and beyond. This nucleosynthesis process, the r-process, is unique in the sense that a combination of nuclear ...