Conveners
11 Nuclear theory in astrophysics
- Friedrich-Karl Thielemann (Basel University)
Carlos Bertulani
(Department of Physics, University of Arizona, Tucson, AZ)
29/06/2006, 08:30
Nuclear theory in astrophysics
Invited
Precise nuclear reaction rates are needed for a detailed description of the
production of elements in primordial nucleosynthesis and during the
hydrostatic burning of stars to constrain the astrophysical models. The
relevant reactions are extremely difficult to measure directly in the
laboratory at the small astrophysical energies [1]. In recent years several
indirect methods have been...
Christian Forssén
(Lawrence Livermore National Laboratory)
29/06/2006, 09:00
Nuclear theory in astrophysics
Oral contribution
I will discuss present attempts to employ many-body nuclear structure information in
nuclear reaction calculations. The foundation of our approach is the ab initio
no-core shell model (NCSM), which is a well-established theoretical framework aimed
at an exact description of nuclear structure starting from high-precision
interactions between the nucleons. We are now able to extract...
Pierre Descouvemont
(Physique Nucléaire Théorique et Physique Mathématique)
29/06/2006, 09:20
Nuclear theory in astrophysics
Invited
First we present general properties of low-energy reactions between light
nuclei. Different theoretical approaches are briefly described. We present
recent results on the 18F(p,a)15O reaction, obtained in a microscopic
cluster model. We point out that some 1/2+ resonances, generally
disregarded, may play a role. The spectroscopic properties of 19Ne, and
charge symmetry between 19Ne and...
Gilbert GOSSELIN
(Comissariat a l'energie atomique (CEA))
29/06/2006, 09:50
Nuclear theory in astrophysics
Oral contribution
In hot dense plasmas, the electronic environment in the immediate vicinity of the
nucleus is modified, and thus, the plasma conditions influence key processes driving
the lifetime of a nuclear level [1]. A correct lifetime prediction requires every
deexcitation process to be evaluated jointly with its corresponding excitation process.
For heavy nuclei, the nuclear lifetime of discrete...
Konrad Czerski
(Institute of Physics, University of Szczecin, Szczecin, Poland)
29/06/2006, 10:10
Experiments in nuclear astrophysics
Oral contribution
In recent years, an enhanced electron screening in metallic environments has been
demonstrated by many groups in experimental investigations of low-energy nuclear
reactions. Similarly, first radioactive decay experiments in metallic materials have
been performed to possibly observe an alteration of the decay constant due to
electron screening. Both kinds of experiments are of fundamental...
