NuGrid: s process in massive stars

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dc.creatorHirschi, Raphael
dc.creatorFrischknecht, Urs
dc.creatorThielemann, F. -K.
dc.creatorPignatari, Marco
dc.creatorBennett, Michael
dc.creatorDiehl, Steven
dc.creatorFryer, Christopher L.
dc.creatorHerwig, Falk
dc.creatorHungerford, Aimee
dc.creatorMagkotsios, Georgios
dc.creatorRockefeller, Gabriel
dc.creatorTimmes, Francis X.
dc.creatorYoung, Patrick
dc.date2008-11-28
dc.date.accessioned2026-07-07T12:06:18Z
dc.date.available2026-07-07T12:06:18Z
dc.descriptionThe s-process production in massive stars at very low metallicities is expected to be negligible due to the low abundance of the neutron source 22Ne, to primary neutron poisons and decreasing iron seed abundances. However, recent models of massive stars including the effects of rotation show that a strong production of 22Ne is possible in the helium core, as a consequence of the primary nitrogen production (observed in halo metal poor stars). Using the PPN post-processing code, we studied the impact of this primary 22Ne on the s process. We find a large production of s elements between strontium and barium, starting with the amount of primary 22Ne predicted by stellar models. There are several key reaction rate uncertainties influencing the s-process efficiency. Among them, 17O(alpha,gamma) may play a crucial role strongly influencing the s process efficiency, or it may play a negligible role, according to the rate used in the calculations. We also report on the development of a new parallel (MPI) post-processing code (MPPNP) designed to follow the complete nucleosynthesis in stars on highly resolved grids. We present here the first post-processing run from the ZAMS up to the end of helium burning for a 15 solar mass model.
dc.descriptionTo appear in the Conference Proceedings for the "10th Symposium on Nuclei in the Cosmos (NIC X)", July 27 - August 1 2008, Mackinack Island, Michigan, USA
dc.identifierhttps://arxiv.org/abs/0811.4654
dc.identifierhttp://arxiv.org/abs/0811.4654
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208617
dc.subjectAstrophysics
dc.titleNuGrid: s process in massive stars
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