Challenges in nucleosynthesis of trans-iron elements

The MAP satellite (microwave anisotropy probe) should be able to directlymeasure this matter density and compare the observed value to the predictions ofBig Bang nucleosynthesis. This will be an important test of the model.

This process is called nucleosynthesis.Its harder and harder to make nuclei with higher masses.

Nucleosynthesis ofthe Heavy Nuclear Species The slow neutron absorption(s) process Therapid (r) neutron absorption process P-process nucleosynthesisConclusion 5.


Stellar Nucleosynthesis - Astronomy Notes

Summary The specificfeatures of the nucleosynthesis processes responsible for the formationof the A 60 elements An incomplete list of excitingresearch problems A few general references 7.


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AB - We briefly summarize some recent work on nucleosynthesis in massive stars and supernovae. Here we explore: 1) the effect of including additional sources of nucleosynthesis besides massive stars into the mixture - especially classical novae and several varieties of Type Ia supernovae; 2) the sensitivity of the results to choices of theoretical nuclear reaction rates in the mass range 28 ≤ A ≤ 70; 3) nucleosynthesis above the iron group using a much larger reaction network; and 4) the sensitivity of these results to recent revisions in experimental reaction rates for isotopes A ≤ 28. For the recently revised rates, 17O is no longer a massive star product.

nucleosynthesis, recombination - University of Oregon

N2 - We briefly summarize some recent work on nucleosynthesis in massive stars and supernovae. Here we explore: 1) the effect of including additional sources of nucleosynthesis besides massive stars into the mixture - especially classical novae and several varieties of Type Ia supernovae; 2) the sensitivity of the results to choices of theoretical nuclear reaction rates in the mass range 28 ≤ A ≤ 70; 3) nucleosynthesis above the iron group using a much larger reaction network; and 4) the sensitivity of these results to recent revisions in experimental reaction rates for isotopes A ≤ 28. For the recently revised rates, 17O is no longer a massive star product.

The Stellar Origin of Copper by Ken Croswell

The main differences andmost important considerations are presented for a selection ofnucleosynthesis processes and reactions, specifically the s-, r-,γ-, and νp-processes.

nucleosynthesis beyond iron - …

Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe. The relative abundances of the Fe isotopes in nature are approximately 54Fe (5.8%), 56Fe (91.7%), 57Fe (2.2%) and 58Fe (0.3%). 60Fe is an extinct radionuclide which had a long half-life (1.5 Myr). Much of the past work on measuring the isotopic composition of Fe has centered on determining 60Fe variations due to processes accompanying nucleosynthesis (i.e., meteorite studies) and ore formation. The isotope 56Fe is of particular interest to nuclear scientists as it represents the most stable nucleus possible. It is not possible to perform fission or fusion on 56Fe and still liberate energy. This does not hold true for any other element. In phases of the meteorites Semarkona und Chervony Kut a correlation between the concentration of 60Ni, the daughter product of 60Fe, and the abundance of the stable iron isotopes could be found which is evidence for the existence of 60Fe at time formation of solar system. Possibly the energy released by the decay of 60Fe contributed, together with the energy released by decay of the radionuclide 26Al, to the remelting and differentiation of asteroids after their formation 4.6 billion years ago. The abundance of 60Ni present in extraterrestrial material may also provide further insight into the origin of the solar system and its early history. Of the stable isotopes, only 57Fe has a nuclear spin ("1/2). For this reason, 57Fe has application as a spin isotope in chemistry and biochemistry.