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Title: Challenges in nucleosynthesis of trans-iron elements

Nucleosynthesis beyond Fe poses additional challenges not encountered when studying astrophysical processes involving light nuclei. Astrophysical sites and conditions are not well known for some of the processes involved. On the nuclear physics side, different approaches are required, both in theory and experiment. The main differences and most important considerations are presented for a selection of nucleosynthesis processes and reactions, specifically the s-, r-, γ-, and νp-processes. Among the discussed issues are uncertainties in sites and production conditions, the difference between laboratory and stellar rates, reaction mechanisms, important transitions, thermal population of excited states, and uncertainty estimates for stellar rates. The utility and limitations of indirect experimental approaches are also addressed. The presentation should not be viewed as confining the discussed problems to the specific processes. The intention is to generally introduce the concepts and possible pitfalls along with some examples. Similar problems may apply to further astrophysical processes involving nuclei from the Fe region upward and/or at high plasma temperatures. The framework and strategies presented here are intended to aid the conception of future experimental and theoretical approaches.
Authors:
 [1]
  1. Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, Hatfield AL10 9AB, United Kingdom and Department of Physics, University of Basel, CH-4056 Basel (Switzerland)
Publication Date:
OSTI Identifier:
22253468
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 4; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ELECTRON TEMPERATURE; EXCITED STATES; ION TEMPERATURE; IRON; LIGHT NUCLEI; NUCLEAR PHYSICS; NUCLEOSYNTHESIS; REACTION KINETICS