ICTP Public Lecture 17 October

[ICTP info point]

ICTP PUBLIC LECTURE
Cosmic Rays Nucleosynthesis and
Spallation Processes in the Early Galaxy
Frank Goldenbaum
Forschungszentrum Jülich
Wednesday, 17 October 2007
20:00, Main Lecture Hall, Main Building
Abstract: The talk will give an overview on the cosmic rays origin and 
energy regimes in
play, stellar burning and the formation of stars. Key reactions and 
mechanisms for the
formation of matter and building stars will be presented. Pressure and 
temperature
behaviour in the center of stars, nuclear reaction rates and energy 
production in stars, as
well as the lifetimes of different cosmic objects will be discussed. 
Spallation processes as e.g.
breaking up of interstellar CNO (Carbon-Nitrogen-Oxygen) as a result of 
energetic collisions
with cosmic-ray protons may be important to describe the interstellar 
abundances. The
fragmentation of heavier cosmic rays that collide with cosmic-ray 
protons in interstellar
space is sometimes called cosmic ray nucleosynthesis. Open questions 
and an outlook on
future experimental approaches will be referred to.
Specifically the study of spallation reactions and nucleosynthesis will 
be motivated. Solar
system- and cosmic rays- abundances of elements will be compared. As an 
example Big-
Bang/primordial nucleosynthesis (mainly the formation of d, 3H, 3He, 
4He and 7Li),
nucleosynthesis in stars (most of the elements heavier than Li), 
hydrogen- and helium- as
well as C-, O- and Si- burning are discussed. The s-, r-, p- processes 
will be commented on
and equilibrium and explosive burning processes will be illustrated.
All are welcome to attend.

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